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Another view on Gilbert damping in two-dimensional ferromagnets Anastasiia A. Pervishko1, Mikhail I. Baglai1,2, Olle Eriksson2,3, and Dmitry Yudin1 1ITMO University, Saint Petersburg 197101, Russia 2Department of Physics and Astronomy, Uppsala University, Box 516, SE-75 121 Uppsala, Sweden 3School of Science and Techno...
2018-07-20
A keen interest towards technological implications of spin-orbit driven magnetization dynamics requests a proper theoretical description, especially in the context of a microscopic framework, to be developed. Indeed, magnetization dynamics is so far approached within Landau-Lifshitz-Gilbert equation which characterizes...
Another view on Gilbert damping in two-dimensional ferromagnets
1807.07897v2
Large deviations for the Langevin equation with strong damping Sandra Cerraiy, Mark Freidlinz Department of Mathematics University of Maryland College Park, MD 20742 USA Abstract We study large deviations in the Langevin dynamics, with damping of order 1and noise of order 1, as #0. The damping coecient is assumed ...
2015-03-03
We study large deviations in the Langevin dynamics, with damping of order $\e^{-1}$ and noise of order $1$, as $\e\downarrow 0$. The damping coefficient is assumed to be state dependent. We proceed first with a change of time and then, we use a weak convergence approach to large deviations and their equivalent formulat...
Large Deviations for the Langevin equation with strong damping
1503.01027v1
Inertia, diffusion and dynamics of a driven skyrmion Christoph Sch ¨utte,1Junichi Iwasaki,2Achim Rosch,1and Naoto Nagaosa2, 3, 1Institut f ¨ur Theoretische Physik, Universit ¨at zu K ¨oln, D-50937 Cologne, Germany 2Department of Applied Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan 3RIKE...
2015-01-02
Skyrmions recently discovered in chiral magnets are a promising candidate for magnetic storage devices because of their topological stability, small size ($\sim 3-100$nm), and ultra-low threshold current density ($\sim 10^{6}$A/m$^2$) to drive their motion. However, the time-dependent dynamics has hitherto been largely...
Inertia, diffusion and dynamics of a driven skyrmion
1501.00444v1
arXiv:1805.06535v3 [math.AP] 28 Nov 2018Stabilization rates for the damped wave equation with H¨ older-regular damping Perry Kleinhenz Abstract We study the decay rate of the energy of solutions to the damped w ave equation in a setup where the geometric control condition is violated. We cons ider damping coefficients ...
2018-05-16
We study the decay rate of the energy of solutions to the damped wave equation in a setup where the geometric control condition is violated. We consider damping coefficients which are $0$ on a strip and vanish like polynomials, $x^{\beta}$. We prove that the semigroup cannot be stable at rate faster than $1/t^{(\beta+2...
Stabilization rates for the damped wave equation with Hölder-regular damping
1805.06535v3
Using rf voltage induced ferromagnetic resonance to study the spin-wave density of states and the Gilbert damping in perpendicularly magnetized disks Thibaut Devolder Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Universit ´e Paris-Saclay, C2N-Orsay, 91405 Orsay cedex, France (Dated: September ...
2017-03-21
We study how the shape of the spinwave resonance lines in rf-voltage induced FMR can be used to extract the spinwave density of states and the damping within the precessing layer in nanoscale tunnel junctions that possess perpendicular anisotropy. We work with a field applied along the easy axis to preserve the uniaxia...
Using rf voltage induced ferromagnetic resonance to study the spin-wave density of states and the Gilbert damping in perpendicularly magnetized disks
1703.07310v2
1 Low Gilbert Damping Constant in Perpendicularly Magnetized W/CoFeB/MgO Films with High Thermal Stability Dustin M. Lattery1†, Delin Zhang2†, Jie Zhu1, Jian-Ping Wang2*, and Xiao jia Wang1* 1Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA 2Department of Electrical and...
2017-09-21
Perpendicular magnetic materials with low damping constant and high thermal stability have great potential for realizing high-density, non-volatile, and low-power consumption spintronic devices, which can sustain operation reliability for high processing temperatures. In this work, we study the Gilbert damping constant...
Low Gilbert Damping Constant in Perpendicularly Magnetized W/CoFeB/MgO Films with High Thermal Stability
1709.07483v1
arXiv:2212.01029v4 [math.AP] 23 Aug 2023EQUIVALENCE BETWEEN THE ENERGY DECAY OF FRACTIONAL DAMPED KLEIN–GORDON EQUATIONS AND GEOMETRIC CONDITIONS FOR DAMPING COEFFICIENTS KOTARO INAMI AND SOICHIRO SUZUKI Abstract. We consider damped s-fractional Klein–Gordon equations on Rd, wheresdenotes the order of the fractional ...
2022-12-02
We consider damped $s$-fractional Klein--Gordon equations on $\mathbb{R}^d$, where $s$ denotes the order of the fractional Laplacian. In the one-dimensional case $d = 1$, Green (2020) established that the exponential decay for $s \geq 2$ and the polynomial decay of order $s/(4-2s)$ hold if and only if the damping coeff...
Equivalence between the energy decay of fractional damped Klein-Gordon equations and geometric conditions for damping coefficients
2212.01029v4
Self-similar shrinkers of the one-dimensional Landau–Lifshitz–Gilbert equation Susana Gutiérrez1and André de Laire2 Abstract The main purpose of this paper is the analytical study of self-shrinker solutions of the one-dimensional Landau–Lifshitz–Gilbert equation (LLG), a model describing the dynamics for the spin in fe...
2020-02-17
The main purpose of this paper is the analytical study of self-shrinker solutions of the one-dimensional Landau-Lifshitz-Gilbert equation (LLG), a model describing the dynamics for the spin in ferromagnetic materials. We show that there is a unique smooth family of backward self-similar solutions to the LLG equation, u...
Self-similar shrinkers of the one-dimensional Landau-Lifshitz-Gilbert equation
2002.06858v2
Page 1 of 13 Dynamic Spin Injection into Chemical Vapor Deposited Graphene A. K. Patra1,a), S. Singh2,a), B. Barin2, Y. Lee3, J.-H. Ahn3, E. del Barco2,b), E. R. Mucciolo2 and B. Özyilmaz1,4,5,6 ,b) 1Department of Physics, National University of Singapore, 2 Science Dri ve 3, Singapore 117542 2Department of P...
2012-11-02
We demonstrate dynamic spin injection into chemical vapor deposition (CVD) grown graphene by spin pumping from permalloy (Py) layers. Ferromagnetic resonance measurements at room temperature reveal a strong enhancement of the Gilbert damping at the Py/graphene interface, exceeding that observed in even Py/platinum inte...
Dynamic Spin Injection into Chemical Vapor Deposited Graphene
1211.0492v1
1 Perpendicular magnetic anisotropy in Pt/Co -based full Heusler alloy /MgO thin films structures M.S. Gabor1a), M. Nasui1, A. Timar -Gabor2 1Center for Superconductivity, Spintronics and Surface Science, Physics and Chemistry Department, Technical University of Cluj -Napoca, Str. Memorandumului , 400114 Clu...
2019-10-29
Perpendicular magnetic anisotropy (PMA) in ultrathin magnetic structures is a key ingredient for the development of electrically controlled spintronic devices. Due to their relatively large spin-polarization, high Curie temperature and low Gilbert damping the Co-based full Heusler alloys are of special importance from ...
Perpendicular magnetic anisotropy in Pt/Co-based full Heusler alloy/MgO thin films structures
1910.13107v1
Nonlinear network dynamics for interconnected micro-grids Dario Bauso June 7, 2021 Abstract This paper deals with transient stability in interconnected micro-grids. The main contribution involves i) robust classi cation of transient dynamics for di erent intervals of the micro-grid parameters (synchronization, inertia...
2017-08-24
This paper deals with transient stability in interconnected micro-grids. The main contribution involves i) robust classification of transient dynamics for different intervals of the micro-grid parameters (synchronization, inertia, and damping); ii) exploration of the analogies with consensus dynamics and bounds on the ...
Nonlinear network dynamics for interconnected micro-grids
1708.07296v1
Draft version March 21, 2023 Typeset using L ATEX default style in AASTeX631 Nonlinear Damping and Field-Aligned Flows of Propagating Shear Alfv en Waves with Braginskii Viscosity Alexander J. B. Russell1 1School of Science and Engineering, University of Dundee, Dundee, DD1 4HN, Scotland, UK ABSTRACT Braginskii MHD pr...
2023-03-20
Braginskii MHD provides a more accurate description of many plasma environments than classical MHD since it actively treats the stress tensor using a closure derived from physical principles. Stress tensor effects nonetheless remain relatively unexplored for solar MHD phenomena, especially in nonlinear regimes. This pa...
Nonlinear Damping and Field-aligned Flows of Propagating Shear Alfvén Waves with Braginskii Viscosity
2303.11128v1
arXiv:1207.3864v1 [math.DS] 17 Jul 2012Asymptotic Dynamics of a Class of Coupled Oscillators Driven by White Noises Wenxian Shena1, Zhongwei Shena, Shengfan Zhoub2 aDepartment of Mathematics and Statistics, Auburn Universi ty, Auburn 36849, USA bDepartment of Applied Mathematics, Shanghai Normal Univer sity, Shanghai...
2012-07-17
This paper is devoted to the study of the asymptotic dynamics of a class of coupled second order oscillators driven by white noises. It is shown that any system of such coupled oscillators with positive damping and coupling coefficients possesses a global random attractor. Moreover, when the damping and the coupling co...
Asymptotic Dynamics of a Class of Coupled Oscillators Driven by White Noises
1207.3864v1
1 Nutation Resonance in Ferromagnets Mikhail Cherkasskii1,*, Michael Farle2,3, and Anna Semisalova2 1 Department of General Physics 1 , St. Petersburg State University , St. Petersburg , 199034, Russia 2 Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg -Essen, Duisburg, 47057, G...
2020-08-27
The inertial dynamics of magnetization in a ferromagnet is investigated theoretically. The analytically derived dynamic response upon microwave excitation shows two peaks: ferromagnetic and nutation resonances. The exact analytical expressions of frequency and linewidth of the magnetic nutation resonance are deduced fr...
Nutation Resonance in Ferromagnets
2008.12221v3
arXiv:2009.11244v1 [math.AP] 23 Sep 2020REMARK ON THE EXPONENTIAL DECAY OF THE SOLUTIONS OF THE DAMPED WAVE EQUATION GIOVANNI CIMATTI Abstract. A condition which guaranties the exponential decay of the so lu- tions of the initial-boundary value problem for the damped w ave equation is proved. A method for the effectiv...
2020-09-23
A condition which guaranties the exponential decay of the solutions of the initial-boundary value problem for the damped wave equation is proved. A method for the effective computability of the coefficient of exponential decay is also presented.
Remark on the exponential decay of the solutions of the damped wave equation
2009.11244v1
arXiv:1510.03571v2 [cond-mat.mtrl-sci] 19 Nov 2015Nonlocal torque operators in ab initio theory of the Gilbert damping in random ferromagnetic alloys I. Turek∗ Institute of Physics of Materials, Academy of Sciences of th e Czech Republic, ˇZiˇ zkova 22, CZ-616 62 Brno, Czech Republic J. Kudrnovsk´ y†and V. Drchal‡ In...
2015-10-13
We present an ab initio theory of the Gilbert damping in substitutionally disordered ferromagnetic alloys. The theory rests on introduced nonlocal torques which replace traditional local torque operators in the well-known torque-correlation formula and which can be formulated within the atomic-sphere approximation. The...
Nonlocal torque operators in ab initio theory of the Gilbert damping in random ferromagnetic alloys
1510.03571v2
arXiv:1403.3199v1 [math.OC] 13 Mar 2014The best decay rate of the damped plate equation in a square Ka¨ ıs Ammari∗Abdelkader Sa¨ ıdi† September 18, 2021 Abstract. In this paper we study the best decay rate of the solutions of a dam ped plate equation in a square and with a homogeneousDirichlet boundary conditions. We...
2014-03-13
In this paper we study the best decay rate of the solutions of a damped plate equation in a square and with a homogeneous Dirichlet boundary conditions. We show that the fastest decay rate is given by the supremum of the real part of the spectrum of the infinitesimal generator of the underlying semigroup, if the dampin...
The best decay rate of the damped plate equation in a square
1403.3199v1
Bayesian interpretation of Backus-Gilbert methods Luigi Del Debbio,𝑎Alessandro Lupo,𝑏,∗Marco Panero𝑐and Nazario Tantalo𝑑 𝑎Higgs Centre for Theoretical Physics, School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, UK 𝑏Aix-Marseille Université, Université de Toul...
2023-11-29
The extraction of spectral densities from Euclidean correlators evaluated on the lattice is an important problem, as these quantities encode physical information on scattering amplitudes, finite-volume spectra, inclusive decay rates, and transport coefficients. In this contribution, we show that the Bayesian approach t...
Bayesian interpretation of Backus-Gilbert methods
2311.18125v1
Landau-Lifshitz theory of the magnon-drag thermopower Benedetta Flebus,1, 2Rembert A. Duine,1, 3and Yaroslav Tserkovnyak2 1Institute for Theoretical Physics and Center for Extreme Matter and Emergent Phenomena, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands 2Department of Physics and Astronomy, Univ...
2016-05-21
Metallic ferromagnets subjected to a temperature gradient exhibit a magnonic drag of the electric current. We address this problem by solving a stochastic Landau-Lifshitz equation to calculate the magnon-drag thermopower. The long-wavelength magnetic dynamics result in two contributions to the electromotive force actin...
Landau-Lifshitz theory of the magnon-drag thermopower
1605.06578v1
arXiv:2003.12967v1 [math.AP] 29 Mar 2020STABILITY RESULTS FOR AN ELASTIC-VISCOELASTIC WAVES INTER ACTION SYSTEMS WITH LOCALIZED KELVIN-VOIGT DAMPING AND WITH AN INT ERNAL OR BOUNDARY TIME DELAY MOUHAMMAD GHADER1, RAYAN NASSER1,2, AND ALI WEHBE1 Abstract. We investigate the stability of a one-dimensional wave equa tio...
2020-03-29
We investigate the stability of a one-dimensional wave equation with non smooth localized internal viscoelastic damping of Kelvin-Voigt type and with boundary or localized internal delay feedback. The main novelty in this paper is that the Kelvin-Voigt and the delay damping are both localized via non smooth coefficient...
Stability results for an elastic-viscoelastic waves interaction systems with localized Kelvin-Voigt damping and with an internal or boundary time delay
2003.12967v1
Magnetisation dynamics of the compensated ferrimagnet Mn 2RuxGa G. Bon glio Radboud University, Institute for Molecules and Materials, 6525 AJ Nijmegen, The Netherlands K. Rode, K. Siewerska, J. Besbas, G. Y. P. Atcheson, P. Stamenov, and J.M.D. Coey CRANN, AMBER and School of Physics, Trinity College Dublin, Ireland A...
2019-09-19
Here we study both static and time-resolved dynamic magnetic properties of the compensated ferrimagnet from room temperature down to 10K, thus crossing the magnetic compensation temperature $T_{M}$. The behaviour is analysed with a model of a simple collinear ferrimagnet with uniaxial anisotropy and site-specific gyrom...
Magnetization dynamics of the compensated ferrimagnet $Mn_{2}Ru_{x}Ga$
1909.09085v1
IEEE TRANSACTIONS ON MAGNETICS, VOL. 53, NO. 10, OCTOBER 2017 1 Damping dependence of spin-torque effects in thermally assisted magnetization reversal Y.P. Kalmykov,1 D. Byrne,2 W.T. Coffey,3 W. J. Dowling,3 S.V.Titov,4 and J.E. Wegrowe5 1Univ. Perpignan Via Domitia, Laboratoire de Mathématiques et Physique, F -...
2017-03-06
Thermal fluctuations of nanomagnets driven by spin-polarized currents are treated via the Landau-Lifshitz-Gilbert equation as generalized to include both the random thermal noise field and Slonczewski spin-transfer torque terms. The magnetization reversal time of such a nanomagnet is then evaluated for wide ranges of d...
Damping dependence of spin-torque effects in thermally assisted magnetization reversal
1703.01879v5
Modeling coupled spin and lattice dynamics Mara Strungaru,1Matthew O A Ellis,2Sergiu Ruta,3Oksana Chubykalo-Fesenko,4Richard F L Evans,1and Roy W Chantrell1 1Department of Physics, University of York, York, United Kingdom 2Department of Computer Science, University of Sheffield, Sheffield, United Kingdom 3Department of P...
2020-10-01
A unified model of molecular and atomistic spin dynamics is presented enabling simulations both in microcanonical and canonical ensembles without the necessity of additional phenomenological spin damping. Transfer of energy and angular momentum between the lattice and the spin systems is achieved by a coupling term bas...
Modeling coupled spin and lattice dynamics
2010.00642v1
1 Magnetic properties in ultra -thin 3d transition metal alloys II: Experimental verification of quantitative theories of damping and spin -pumping Martin A. W. Schoen,1,2* Juriaan Lucassen,3 Hans T. Nembach,1 Bert Koopmans,3 T. J. Silva,1 Christian H. Bac k,2 and Justin M. Shaw1 1Quantum E lectromagnetics...
2017-01-10
A systematic experimental study of Gilbert damping is performed via ferromagnetic resonance for the disordered crystalline binary 3d transition metal alloys Ni-Co, Ni-Fe and Co-Fe over the full range of alloy compositions. After accounting for inhomogeneous linewidth broadening, the damping shows clear evidence of both...
Magnetic properties in ultra-thin 3d transition metal alloys II: Experimental verification of quantitative theories of damping and spin-pumping
1701.02475v1
arXiv:1510.06793v1 [cond-mat.mtrl-sci] 23 Oct 2015Laser-induced THz magnetization precession for a tetragon al Heusler-like nearly compensated ferrimagnet S. Mizukami,1,a)A. Sugihara,1S. Iihama,2Y. Sasaki,2K. Z. Suzuki,1and T. Miyazaki1 1)WPI Advanced Institute for Materials Research, Tohoku Univ ersity, Sendai 980-8...
2015-10-23
Laser-induced magnetization precessional dynamics was investigated in epitaxial films of Mn$_3$Ge, which is a tetragonal Heusler-like nearly compensated ferrimagnet. The ferromagnetic resonance (FMR) mode was observed, the precession frequency for which exceeded 0.5 THz and originated from the large magnetic anisotropy...
Laser-induced THz magnetization precession for a tetragonal Heusler-like nearly compensated ferrimagnet
1510.06793v1
arXiv:1909.09838v1 [math.AP] 21 Sep 2019STABILITY FOR COUPLED WAVES WITH LOCALLY DISTURBED KELVIN-VOIGT DAMPING FATHI HASSINE AND NADIA SOUAYEH Abstract. We consider a coupled wave system with partial Kelvin-Voigt damping in the interval (−1,1), where one wave is dissipative and the other does not. When the damping i...
2019-09-21
We consider a coupled wave system with partial Kelvin-Voigt damping in the interval (-1,1), where one wave is dissipative and the other does not. When the damping is effective in the whole domain (-1,1) it was proven in H.Portillo Oquendo and P.Sanez Pacheco, optimal decay for coupled waves with Kelvin-voigt damping, A...
Stability for coupled waves with locally disturbed Kelvin-Voigt damping
1909.09838v1
Nonlocal feedback in ferromagnetic resonance Thomas Bose and Steffen Trimper Institute of Physics, Martin-Luther-University, D-06099 Halle, Germany (Dated: April 27, 2022) Abstract Ferromagnetic resonance in thin films is analyzed under the influence of spatiotemporal feedback effects. The equation of motion for the magne...
2012-04-24
Ferromagnetic resonance in thin films is analyzed under the influence of spatiotemporal feedback effects. The equation of motion for the magnetization dynamics is nonlocal in both space and time and includes isotropic, anisotropic and dipolar energy contributions as well as the conserved Gilbert- and the non-conserved ...
Nonlocal feedback in ferromagnetic resonance
1204.5342v1
The Cauchy problem for the Landau–Lifshitz–Gilbert equation in BMO and self-similar solutions Susana Gutiérrez1and André de Laire2 Abstract We prove a global well-posedness result for the Landau–Lifshitz equation with Gilbert damping provided that the BMO semi-norm of the initial data is small. As a consequence, we ded...
2017-01-11
We prove a global well-posedness result for the Landau-Lifshitz equation with Gilbert damping provided that the BMO semi-norm of the initial data is small. As a consequence, we deduce the existence of self-similar solutions in any dimension. In the one-dimensional case, we characterize the self-similar solutions associ...
The Cauchy problem for the Landau-Lifshitz-Gilbert equation in BMO and self-similar solutions
1701.03083v2
arXiv:1806.04782v3 [cond-mat.other] 9 Dec 2020Dynamical and current-induced Dzyaloshinskii-Moriya int eraction: Role for damping, gyromagnetism, and current-induced torques in noncolline ar magnets Frank Freimuth1,2,∗Stefan Bl¨ ugel1, and Yuriy Mokrousov1,2 1Peter Gr¨ unberg Institut and Institute for Advanced Simula...
2018-06-12
Both applied electric currents and magnetization dynamics modify the Dzyaloshinskii-Moriya interaction (DMI), which we call current-induced DMI (CIDMI) and dynamical DMI (DDMI), respectively. We report a theory of CIDMI and DDMI. The inverse of CIDMI consists in charge pumping by a time-dependent gradient of magnetizat...
Dynamical and current-induced Dzyaloshinskii-Moriya interaction: Role for damping, gyromagnetism, and current-induced torques in noncollinear magnets
1806.04782v3
1 Helicity-dependent optical control of the magnetization state emerging from the Landau-Lifshitz-Gilbert equation Benjamin Assouline, Amir Capua* Department of Applied Physics, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel *e-mail: amir.capua@mail.huji.ac.il Abstract: It is well known that the ...
2023-06-07
It is well known that the Gilbert relaxation time of a magnetic moment scales inversely with the magnitude of the externally applied field, H, and the Gilbert damping, {\alpha}. Therefore, in ultrashort optical pulses, where H can temporarily be extremely large, the Gilbert relaxation time can momentarily be extremely ...
Helicity-dependent optical control of the magnetization state emerging from the Landau-Lifshitz-Gilbert equation
2306.04617v2
arXiv:1011.5868v1 [cond-mat.mes-hall] 26 Nov 2010Draft Dependence of nonlocal Gilbert damping on the ferromagneti c layer type in FM/Cu/Pt heterostructures A. Ghosh, J.F. Sierra, S. Auffret, U. Ebels1and W.E. Bailey2 1)SPINTEC, UMR(8191) CEA / CNRS / UJF / Grenoble INP ; INAC, 17 rue des Martyrs, 38054 Grenoble Cedex,...
2010-11-26
We have measured the size effect in nonlocal Gilbert relaxation rate in FM(t$_{FM}$) / Cu (5nm) [/ Pt (2nm)] / Al(2nm) heterostructures, FM = \{ Ni$_{81}$Fe$_{19}$, Co$_{60}$Fe$_{20}$B$_{20}$, pure Co\}. Common behavior is observed for three FM layers, where the additional relaxation obeys both a strict inverse power l...
Dependence of nonlocal Gilbert damping on the ferromagnetic layer type in FM/Cu/Pt heterostructures
1011.5868v1
Tuning Non -Gilbert -type damping in FeGa film s on MgO(001) via oblique deposition Yang Li1,2, Yan Li1,2, Qian Liu3, Zhe Yuan3, Qing -Feng Zhan4, Wei He1, Hao-Liang Liu1, Ke Xia3, We i Yu1, Xiang-Qun Zhang1, Zhao -Hua Cheng1,2,5 a) 1State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed...
2019-11-02
The ability to tailor the damping factor is essential for spintronic and spin-torque applications. Here, we report an approach to manipulate the damping factor of FeGa/MgO(001) films by oblique deposition. Owing to the defects at the surface or interface in thin films, two-magnon scattering (TMS) acts as a non-Gilbert ...
Tuning Non-Gilbert-type damping in FeGa films on MgO(001) via oblique deposition
1911.00728v1
1 Magnetization Dynamics in Synthetic Antiferromagnets with Perpendicular Magnetic Anisotropy Dingbin Huang1,*, Delin Zhang2, Yun Kim1, Jian-Ping Wang2, and Xiaojia Wang1,* 1Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA 2Department of Electrical and Computer Enginee...
2022-11-14
Understanding the rich physics of magnetization dynamics in perpendicular synthetic antiferromagnets (p-SAFs) is crucial for developing next-generation spintronic devices. In this work, we systematically investigate the magnetization dynamics in p-SAFs combining time-resolved magneto-optical Kerr effect (TR-MOKE) measu...
Magnetization Dynamics in Synthetic Antiferromagnets with Perpendicular Magnetic Anisotropy
2211.07744v2
arXiv:2105.09879v2 [math.AP] 19 Mar 2024On the critical exponent for the semilinear Euler-Poisson-Darboux-Tricomi equation with power nonlinearity Alessandro Palmieri Department of Mathematics, University of Bari, Via E. Orabo na 4, 70125 Bari, Italy March 20, 2024 Abstract In this note, we derive a blow-up result fo...
2021-05-20
In this note, we derive a blow-up result for a semilinear generalized Tricomi equation with damping and mass terms having time-dependent coefficients. We consider these coefficients with critical decay rates. Due to this threshold nature of the time-dependent coefficients (both for the damping and for the mass), the mu...
On the the critical exponent for the semilinear Euler-Poisson-Darboux-Tricomi equation with power nonlinearity
2105.09879v2
A SECOND-ORDER NUMERICAL METHOD FOR LANDAU-LIFSHITZ-GILBERT EQUATION WITH LARGE DAMPING PARAMETERS YONGYONG CAI, JINGRUN CHEN, CHENG WANG, AND CHANGJIAN XIE Abstract. A second order accurate numerical scheme is proposed and imple- mented for the Landau-Lifshitz-Gilbert equation, which models magnetization dynamics in f...
2021-05-08
A second order accurate numerical scheme is proposed and implemented for the Landau-Lifshitz-Gilbert equation, which models magnetization dynamics in ferromagnetic materials, with large damping parameters. The main advantages of this method are associated with the following features: (1) It only solves linear systems o...
A second-order numerical method for Landau-Lifshitz-Gilbert equation with large damping parameters
2105.03576v1
A single-ion nonlinear mechanical oscillator N. Akerman, S. Kotler, Y. Glickman, Y. Dallal, A. Keselman, and R. Ozeri Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel We study the steady state motion of a single trapped ion oscillator driven to the nonlinear regime. Damping is achieved v...
2010-03-08
We study the steady state motion of a single trapped ion oscillator driven to the nonlinear regime. Damping is achieved via Doppler laser-cooling. The ion motion is found to be well described by the Duffing oscillator model with an additional nonlinear damping term. We demonstrate a unique ability of tuning both the li...
A single-ion nonlinear mechanical oscillator
1003.1577v1
Thermal fluctuation field for current-induced domain wall motion Kyoung-Whan Kim and Hyun-Woo Lee PCTP and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea /H20849Received 18 May 2010; revised manuscript received 23 August 2010; published 20 October 2010 /H20850 Current-induced do...
2010-10-04
Current-induced domain wall motion in magnetic nanowires is affected by thermal fluctuation. In order to account for this effect, the Landau-Lifshitz-Gilbert equation includes a thermal fluctuation field and literature often utilizes the fluctuation-dissipation theorem to characterize statistical properties of the ther...
Thermal fluctuation field for current-induced domain wall motion
1010.0478v2
Localized spin waves in isolated kskyrmions Levente Rózsa,1,Julian Hagemeister,1Elena Y. Vedmedenko,1and Roland Wiesendanger1 1Department of Physics, University of Hamburg, D-20355 Hamburg, Germany (Dated: October 16, 2018) Thelocalizedmagnonmodesofisolated kskyrmionsonafield-polarizedbackgroundareanalyzed basedonthe...
2018-10-15
The localized magnon modes of isolated $k\pi$ skyrmions on a field-polarized background are analyzed based on the Landau-Lifshitz-Gilbert equation within the terms of an atomistic classical spin model, with system parameters based on the Pd/Fe biatomic layer on Ir(111). For increasing skyrmion order $k$ a higher number...
Localized spin waves in isolated $kπ$ skyrmions
1810.06471v1
Molecular Hybridization Induced Antidamping and Sizable Enhanced Spin-to-Charge Conversion in Co 20Fe60B20/β-W/C 60Heterostructures Antarjami Sahoo 1, Aritra Mukhopadhyaya 2, Swayang Priya Mahanta 1, Md. Ehesan Ali 2, Subhankar Bedanta 1,3 1 Laboratory for Nanomagnetism and Magnetic Materials (LNMM), School of Physical...
2023-12-31
Development of power efficient spintronics devices has been the compelling need in the post-CMOS technology era. The effective tunability of spin-orbit-coupling (SOC) in bulk and at the interfaces of hybrid materials stacking is a prerequisite for scaling down the dimension and power consumption of these devices. In th...
Molecular Hybridization Induced Antidamping and Sizable Enhanced Spin-to-Charge Conversion in Co20Fe60B20/$β$-W/C60 Heterostructures
2401.00486v1
Magnified Damping under Rashba Spin Orbit Coupling November 1, 2015 1 Magnified Damping under Rashba Spin Orbit Coupling Seng Ghee Tan† 1,2 ,Mansoor B.A.Jalil1,2 (1) Data Storage Institute, Agency for Science, Technology and Research (A*STAR) 2 Fusionopolis Way , #08-01 DSI , Innovis , Singapore...
2015-11-13
The spin orbit coupling spin torque consists of the field-like [REF: S.G. Tan et al., arXiv:0705.3502, (2007).] and the damping-like terms [REF: H. Kurebayashi et al., Nature Nanotechnology 9, 211 (2014).] that have been widely studied for applications in magnetic memory. We focus, in this article, not on the spin orbi...
Magnified Damping under Rashba Spin Orbit Coupling
1511.04227v1
arXiv:1805.11468v1 [cond-mat.mtrl-sci] 29 May 2018APS/123-QED Gilbert damping in non-collinear magnetic systems S. Mankovsky, S. Wimmer, H. Ebert Department of Chemistry/Phys. Chemistry, LMU Munich, Butenandtstrasse 11, D-81377 Munich, Germany (Dated: May 30, 2018) The modification of the magnetization dissipation or ...
2018-05-29
The modification of the magnetization dissipation or Gilbert damping caused by an inhomogeneous magnetic structure and expressed in terms of a wave vector dependent tensor $\underline{\alpha}(\vec{q})$ is investigated by means of linear response theory. A corresponding expression for $\underline{\alpha}(\vec{q})$ in te...
Gilbert damping in non-collinear magnetic system
1805.11468v1
arXiv:0705.0406v1 [cond-mat.mtrl-sci] 3 May 2007Planar spin-transfer device with a dynamic polarizer. Ya. B. Bazaliy,1D. Olaosebikan,2and B. A Jones1 1IBM Almaden Research Center, 650 Harry Road, San Jose, CA 951 20 2Department of Physics, Cornell University, Ithaca, NY 1485 3 (Dated: July, 2006) In planar nano-magne...
2007-05-03
In planar nano-magnetic devices magnetization direction is kept close to a given plane by the large easy-plane magnetic anisotropy, for example by the shape anisotropy in a thin film. In this case magnetization shows effectively in-plane dynamics with only one angle required for its description. Moreover, the motion ca...
Planar spin-transfer device with a dynamic polarizer
0705.0406v1
arXiv:0705.0508v1 [cond-mat.mtrl-sci] 3 May 2007Effective attraction induced by repulsive interaction in a s pin-transfer system Ya. B. Bazaliy Instituut Lorentz, Leiden University, The Netherlands, Department of Physics and Astronomy, University of South Ca rolina, Columbia, SC, and Institute of Magnetism, National A...
2007-05-03
In magnetic systems with dominating easy-plane anisotropy the magnetization can be described by an effective one dimensional equation for the in-plane angle. Re-deriving this equation in the presence of spin-transfer torques, we obtain a description that allows for a more intuitive understanding of spintronic devices' ...
Effective attraction induced by repulsive interaction in a spin-transfer system
0705.0508v1
arXiv:0705.1990v1 [cond-mat.str-el] 14 May 2007Identification of the dominant precession damping mechanis m in Fe, Co, and Ni by first-principles calculations K. Gilmore1,2, Y.U. Idzerda2, and M.D. Stiles1 1National Institute of Standards and Technology, Gaithersb urg, MD 20899-8412 2Physics Department, Montana State U...
2007-05-14
The Landau-Lifshitz equation reliably describes magnetization dynamics using a phenomenological treatment of damping. This paper presents first-principles calculations of the damping parameters for Fe, Co, and Ni that quantitatively agree with existing ferromagnetic resonance measurements. This agreement establishes th...
Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
0705.1990v1
arXiv:0706.0529v1 [cond-mat.mtrl-sci] 4 Jun 2007Generation of microwave radiation in planar spin-transfer devices Ya. B. Bazaliy Instituut Lorentz, Leiden University, The Netherlands, Department of Physics and Astronomy, University of South Ca rolina, Columbia, SC, and Institute of Magnetism, National Academy of Scie...
2007-06-04
Current induced precession states in spin-transfer devices are studied in the case of large easy plane anisotropy (present in most experimental setups). It is shown that the effective one-dimensional planar description provides a simple qualitative understanding of the emergence and evolution of such states. Switching ...
Generation of microwave radiation in planar spin-transfer devices
0706.0529v1
arXiv:0706.3160v3 [cond-mat.mes-hall] 9 Jan 2008Spin pumping by a field-driven domain wall R.A. Duine Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands (Dated: October 26, 2018) We present the theory of spin pumping by a field-driven domain wall for the situation that...
2007-06-21
We calculate the charge current in a metallic ferromagnet to first order in the time derivative of the magnetization direction. Irrespective of the microscopic details, the result can be expressed in terms of the conductivities of the majority and minority electrons and the non-adiabatic spin transfer torque parameter ...
Spin pumping by a field-driven domain wall
0706.3160v3
arXiv:0708.3827v3 [physics.class-ph] 27 Mar 2008Linear frictional forces cause orbits to neither circularize nor precess P.M. Hamilton1,2and M. Crescimanno1 1Dept. of Physics and Astronomy, Youngstown State University 2Dept. of Physics, University of Maryland E-mail:pmham@umd.edu, mcrescim@cc.ysu.edu PACS numbers: 46...
2007-08-28
For the undamped Kepler potential the lack of precession has historically been understood in terms of the Runge-Lenz symmetry. For the damped Kepler problem this result may be understood in terms of the generalization of Poisson structure to damped systems suggested recently by Tarasov[1]. In this generalized algebraic...
Linear frictional forces cause orbits to neither circularize nor precess
0708.3827v3
arXiv:0708.4164v1 [cs.IT] 30 Aug 2007Asymptotic improvement of the Gilbert-Varshamov bound for linear codes Philippe Gaborit∗Gilles Z´ emor† August 29, 2007 Abstract The Gilbert-Varshamov bound states that the maximum size A2(n,d) of a binary code of length nand minimum distance dsatisfiesA2(n,d)≥ 2n/V(n,d−1) where V(...
2007-08-30
The Gilbert-Varshamov bound states that the maximum size A_2(n,d) of a binary code of length n and minimum distance d satisfies A_2(n,d) >= 2^n/V(n,d-1) where V(n,d) stands for the volume of a Hamming ball of radius d. Recently Jiang and Vardy showed that for binary non-linear codes this bound can be improved to A_2(n,...
Asymptotic improvement of the Gilbert-Varshamov bound for linear codes
0708.4164v1
arXiv:0709.2937v2 [cond-mat.mes-hall] 23 Jan 2008Theory of current-driven magnetization dynamics in inhomogeneous ferromagnets Yaroslav Tserkovnyak,1Arne Brataas,2and Gerrit E. W. Bauer3 1Department of Physics and Astronomy, University of California, Los Angeles, California 90095, U SA 2Department of Physics, Norwegi...
2007-09-18
We give a brief account of recent developments in the theoretical understanding of the interaction between electric currents and inhomogeneous ferromagnetic order parameters. We start by discussing the physical origin of the spin torques responsible for this interaction and construct a phenomenological description. We ...
Theory of current-driven magnetization dynamics in inhomogeneous ferromagnets
0709.2937v2
arXiv:0802.1740v1 [cond-mat.other] 12 Feb 2008Temperature dependent magnetization dynamics of magnetic nanoparticles A. Sukhov1,2and J. Berakdar2 1Max-Planck-Institut f¨ ur Mikrostrukturphysik, Weinberg 2, D-0 6120 Halle/Saale, Germany 2Institut f¨ ur Physik, Martin-Luther-Universit¨ at Halle-Wittenbe rg, Heinrich-Da...
2008-02-12
Recent experimental and theoretical studies show that the switching behavior of magnetic nanoparticles can be well controlled by external time-dependent magnetic fields. In this work, we inspect theoretically the influence of the temperature and the magnetic anisotropy on the spin-dynamics and the switching properties ...
Temperature dependent magnetization dynamics of magnetic nanoparticles
0802.1740v1
arXiv:0807.3715v1 [quant-ph] 23 Jul 2008Damped driven coupled oscillators: entanglement, decoherence and the classical limit R. D. Guerrero Mancilla, R. R. Rey-Gonz´ alez and K. M. Fonseca-Romero Grupo de ´Optica e Informaci´ on Cu´ antica, Departamento de F´ ısica, Universidad Nacional de Colombia - Bogot´ a E-mail:...
2008-07-23
The interaction of (two-level) Rydberg atoms with dissipative QED cavity fields can be described classically or quantum mechanically, even for very low temperatures and mean number of photons, provided the damping constant is large enough. We investigate the quantum-classical border, the entanglement and decoherence of...
Damped driven coupled oscillators: entanglement, decoherence and the classical limit
0807.3715v1
arXiv:0809.2611v1 [cond-mat.mes-hall] 16 Sep 2008Stochastic dynamics of magnetization in a ferromagnetic na noparticle out of equilibrium Denis M. Basko1and Maxim G. Vavilov2 1International School of Advanced Studies (SISSA), via Beir ut 2-4, 34014 Trieste, Italy 2Department of Physics, University of Wisconsin, Madis...
2008-09-16
We consider a small metallic particle (quantum dot) where ferromagnetism arises as a consequence of Stoner instability. When the particle is connected to electrodes, exchange of electrons between the particle and the electrodes leads to a temperature- and bias-driven Brownian motion of the direction of the particle mag...
Stochastic dynamics of magnetization in a ferromagnetic nanoparticle out of equilibrium
0809.2611v1
arXiv:0809.4311v1 [cond-mat.other] 25 Sep 2008The theory of magnetic field induced domain-wall propagatio n in magnetic nanowires X. R. Wang, P. Yan, J. Lu, and C. He Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China A global picture of magnetic domain wall (...
2008-09-25
A global picture of magnetic domain wall (DW) propagation in a nanowire driven by a magnetic field is obtained: A static DW cannot exist in a homogeneous magnetic nanowire when an external magnetic field is applied. Thus, a DW must vary with time under a static magnetic field. A moving DW must dissipate energy due to t...
The theory of magnetic field induced domain-wall propagation in magnetic nanowires
0809.4311v1
Transverse spin di usion in ferromagnets Yaroslav Tserkovnyak,1E. M. Hankiewicz,2and Giovanni Vignale3 1Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA 2Institut f ur Theoretische Physik und Astrophysik, Universit at W urzburg, 97074 W urzburg, Germany 3Department of Ph...
2008-10-08
We discuss the dissipative diffusion-type term of the form $\mathbf{m}\times\nabla^2\partial_t\mathbf{m}$ in the phenomenological Landau-Lifshitz equation of ferromagnetic precession, which describes enhanced Gilbert damping of finite-momentum spin waves. This term arises physically from itinerant-electron spin flows t...
Transverse spin diffusion in ferromagnets
0810.1340v2
arXiv:0810.2870v1 [physics.class-ph] 16 Oct 2008 /C1/D2 /D8/CT/D6/CP /D8/CX/D3/D2 /D3/CU /D6/CT/CT/CS /CP/D2/CS /CP /D3/D9/D7/D8/CX /D6/CT/D7/D3/D2/CP/D8/D3/D6 /CX/D2 /D0/CP/D6/CX/D2/CT/D8/B9/D0/CX/CZ /CT /D7/DD/D7/D8/CT/D1/D7/BY /CP/CQ /D6/CX /CT /CB/CX/D0/DA/CP/B8 /C2/CT/CP/D2 /C3/CT/D6/CV/D3/D1/CP /D6/CS/B8 /CP/...
2008-10-16
Sound emergence in clarinetlike instruments is investigated in terms of instability of the static regime. Various models of reed-bore coupling are considered, from the pioneering work of Wilson and Beavers ["Operating modes of the clarinet", J. Acoust. Soc. Am. 56, 653--658 (1974)] to more recent modeling including vis...
Interaction of reed and acoustic resonator in clarinetlike systems
0810.2870v1
arXiv:0810.3893v1 [quant-ph] 21 Oct 2008On Wigner functions and a damped star product in dissipative phase-space quantum mechanics B. Belchev, M.A. Walton Department of Physics, University of Lethbridge Lethbridge, Alberta, Canada T1K 3M4 borislav.belchev@uleth.ca, walton@uleth.ca March 1, 2022 Abstract Dito and Turr...
2008-10-21
Dito and Turrubiates recently introduced an interesting model of the dissipative quantum mechanics of a damped harmonic oscillator in phase space. Its key ingredient is a non-Hermitian deformation of the Moyal star product with the damping constant as deformation parameter. We compare the Dito-Turrubiates scheme with p...
On Wigner functions and a damped star product in dissipative phase-space quantum mechanics
0810.3893v1
1 Spin Transfer Torque as a Non-Conservative Pseudo-Field Sayeef Salahuddin*, Deepanjan Datta and Supriyo Datta School of Electrical and Computer Engineering and NSF Center for Computational Nanotechnology (NCN), Purdue University, West Lafayette, IN 47906 *Present address: Electrical Engineering and Computer Sc...
2008-11-21
In this paper we show that the spin transfer torque can be described by a pseudo magnetic field, proportional to the magnetic moment of the itinerant electrons that enters the Landau-Lifshitz-Gilbert equation in the same way as other external or internal magnetic fields. However, unlike an ordinary magnetic field, whic...
Spin Transfer Torque as a Non-Conservative Pseudo-Field
0811.3472v1
arXiv:0812.2209v1 [quant-ph] 11 Dec 2008Frequency-dependent Drude damping in Casimir force calculations R. Esquivel-Sirvent1,∗ 1Instituto de F´ ısica, Universidad Nacional Aut’onoma de M´ exico, Apdo. Postal 20-364, M´ exico D.F. 01000, M´ exico Abstract The Casimir force is calculated between Au thin films that are d...
2008-12-11
The Casimir force is calculated between Au thin films that are described by a Drude model with a frequency dependent damping function. The model parameters are obtained from available experimental data for Au thin films. Two cases are considered; annealed and nonannealed films that have a different damping function. Co...
Frequency-dependent Drude damping in Casimir force calculations
0812.2209v1
arXiv:0812.2570v1 [cond-mat.mtrl-sci] 13 Dec 2008Non-Adiabatic Spin Transfer Torque in Real Materials Ion Garate1, K. Gilmore2,3, M. D. Stiles2, and A.H. MacDonald1 1Department of Physics, The University of Texas at Austin, Au stin, TX 78712 2Center for Nanoscale Science and Technology, National Inst itute of Standar...
2008-12-13
The motion of simple domain walls and of more complex magnetic textures in the presence of a transport current is described by the Landau-Lifshitz-Slonczewski (LLS) equations. Predictions of the LLS equations depend sensitively on the ratio between the dimensionless material parameter $\beta$ which characterizes non-ad...
Non-Adiabatic Spin Transfer Torque in Real Materials
0812.2570v1
arXiv:0901.2191v1 [hep-th] 15 Jan 2009The sound damping constant for generalized theories of gravity Ram Brustein Department of Physics, Ben-Gurion University, Beer-Sheva, 84105 Israel, E-mail: ramyb@bgu.ac.il A.J.M. Medved Physics Department, University of Seoul, Seoul 130-743 Korea, E-mail: allan@physics.uos.ac.kr ...
2009-01-15
The near-horizon metric for a black brane in Anti-de Sitter (AdS) space and the metric near the AdS boundary both exhibit hydrodynamic behavior. We demonstrate the equivalence of this pair of hydrodynamic systems for the sound mode of a conformal theory. This is first established for Einstein's gravity, but we then sho...
The sound damping constant for generalized theories of gravity
0901.2191v1
arXiv:0904.0813v2 [cs.IT] 8 Apr 2009Projective Space Codes for the Injection Metric Azadeh Khaleghi, Frank R. Kschischang Department of Electrical and Computer Engineering, Univer sity of Toronto, Canada Email:{azalea,frank }@comm.utoronto.ca Abstract—In the context of error control in random linear network coding, i...
2009-04-05
In the context of error control in random linear network coding, it is useful to construct codes that comprise well-separated collections of subspaces of a vector space over a finite field. In this paper, the metric used is the so-called "injection distance", introduced by Silva and Kschischang. A Gilbert-Varshamov bou...
Projective Space Codes for the Injection Metric
0904.0813v2
arXiv:0905.3242v1 [math.SP] 20 May 2009EIGENVALUE ASYMPTOTICS, INVERSE PROBLEMS AND A TRACE FORMULA FOR THE LINEAR DAMPED WAVE EQUATION DENIS BORISOV AND PEDRO FREITAS Abstract. We determine the general form of the asymptotics for Dirichlet eigenvalues of the one–dimensional linear damped wave operator. Asaconsequenc...
2009-05-20
We determine the general form of the asymptotics for Dirichlet eigenvalues of the one-dimensional linear damped wave operator. As a consequence, we obtain that given a spectrum corresponding to a constant damping term this determines the damping term in a unique fashion. We also derive a trace formula for this problem.
Eigenvalue asymptotics, inverse problems and a trace formula for the linear damped wave equation
0905.3242v1
arXiv:0905.4650v2 [math.PR] 8 Nov 2012The Annals of Applied Probability 2011, Vol. 21, No. 3, 1053–1072 DOI:10.1214/10-AAP718 c/circlecopyrtInstitute of Mathematical Statistics , 2011 HAMILTON CYCLES IN RANDOM GEOMETRIC GRAPHS By J´ozsef Balogh1, B´ela Bollob ´as2, Michael Krivelevich3, Tobias M ¨uller4and Mark Walte...
2009-05-28
We prove that, in the Gilbert model for a random geometric graph, almost every graph becomes Hamiltonian exactly when it first becomes 2-connected. This answers a question of Penrose. We also show that in the k-nearest neighbor model, there is a constant \kappa\ such that almost every \kappa-connected graph has a Hamil...
Hamilton cycles in random geometric graphs
0905.4650v2
arXiv:0905.4779v2 [cond-mat.mtrl-sci] 15 Jun 2009Beaujour et al. Ferromagnetic resonance linewidth in ultrathin films with p erpendicular magnetic anisotropy J-M. Beaujour,1D. Ravelosona,2I. Tudosa,3E. Fullerton,3and A. D. Kent1 1Department of Physics, New York University, 4 Washington Pl ace, New York, New York 10003...
2009-05-29
Transition metal ferromagnetic films with perpendicular magnetic anisotropy (PMA) have ferromagnetic resonance (FMR) linewidths that are one order of magnitude larger than soft magnetic materials, such as pure iron (Fe) and permalloy (NiFe) thin films. A broadband FMR setup has been used to investigate the origin of th...
Ferromagnetic resonance linewidth in ultrathin films with perpendicular magnetic anisotropy
0905.4779v2
arXiv:0908.0481v1 [cond-mat.mes-hall] 4 Aug 2009 /CC/CX/D1/CT /CS/D3/D1/CP/CX/D2 /CS/CT/D8/CT /D8/CX/D3/D2 /D3/CU /D4/D9/D0/D7/CT/CS /D7/D4/CX/D2 /D8/D3/D6/D5/D9/CT /CS/CP/D1/D4/CX/D2/CV /D6/CT/CS/D9 /D8/CX/D3/D2/C4/D3/D2/CV/CU/CT/CX /CH /CT1/B8 /CB/CP/D1/CX/D6 /BZ/CP/D6/DE/D3/D21/B8 /CA/CX /CW/CP/D6/CS /BT/BA /CF /...
2009-08-04
Combining multiple ultrafast spin torque impulses with a 5 nanosecond duration pulse for damping reduction, we observe time-domain precession which evolves from an initial 1 ns duration transient with changing precessional amplitude to constant amplitude oscillations persisting for over 2 ns. These results are consiste...
Time domain detection of pulsed spin torque damping reduction
0908.0481v1
Jal of Engineering M ech. (ASCE) , 135(11), pp.1305 -1314, 2009 Delépine, Lenti, Bonnet, Semblat 1 Nonlinear viscoelastic wave propagation: an extension of Nearly Constant Attenuation (NCQ) models. Nicolas Delé pine1, Luca Lenti2, Guy Bonnet3, Jean -François Semblat, A.M.ASCE4 Subject headings : Inelasticit...
2009-08-19
Hysteretic damping is often modeled by means of linear viscoelastic approaches such as "nearly constant Attenuation (NCQ)" models. These models do not take into account nonlinear effects either on the stiffness or on the damping, which are well known features of soil dynamic behavior. The aim of this paper is to propos...
Nonlinear viscoelastic wave propagation: an extension of Nearly Constant Attenuation (NCQ) models
0908.2715v2
Rigorous Theory of Optical Trapping by an Optical Vortex Beam Jack Ng,1 Zhifang Lin,1,2 and C. T. Chan1 1Department of Physics and Willia m Mong Institute of Nano Science & Technology, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China. 2Department of Physics, Fudan University, S...
2009-08-31
We propose a rigorous theory for the optical trapping by optical vortices, which is emerging as an important tool to trap mesoscopic particles. The common perception is that the trapping is solely due to the gradient force, and may be characterized by three real force constants. However, we show that the optical vortex...
Rigorous Theory of Optical Trapping by an Optical Vortex Beam
0908.4504v1
arXiv:0910.0163v1 [cond-mat.mes-hall] 1 Oct 2009Spin motive forces and current fluctuations due to Brownian motion of domain walls M.E. Lucassen, R.A. Duine Institute for Theoretical Physics, Utrecht University, Le uvenlaan 4, 3584 CE Utrecht, The Netherlands Abstract We compute the power spectrum of the noise in the ...
2009-10-01
We compute the power spectrum of the noise in the current due to spin motive forces by a fluctuating domain wall. We find that the power spectrum of the noise in the current is colored, and depends on the Gilbert damping, the spin transfer torque parameter $\beta$, and the domain-wall pinning potential and magnetic ani...
Spin motive forces and current fluctuations due to Brownian motion of domain walls
0910.0163v1
arXiv:0910.1477v2 [cond-mat.mtrl-sci] 2 Feb 2010Fast domain wall propagation under an optimal field pulse in m agnetic nanowires Z. Z. Sun and J. Schliemann Institute for Theoretical Physics, University of Regensbu rg, D-93040 Regensburg, Germany (Dated: December 2, 2018) Weinvestigatefield-drivendomainwall (DW)propaga...
2009-10-08
We investigate field-driven domain wall (DW) propagation in magnetic nanowires in the framework of the Landau-Lifshitz-Gilbert equation. We propose a new strategy to speed up the DW motion in a uniaxial magnetic nanowire by using an optimal space-dependent field pulse synchronized with the DW propagation. Depending on ...
Fast domain wall propagation under an optimal field pulse in magnetic nanowires
0910.1477v2
arXiv:0910.3776v1 [cond-mat.other] 20 Oct 2009APS/123-QED Bifurcation and chaos in spin-valve pillars in a periodic ap plied magnetic field S. Murugesh1∗and M. Lakshmanan2† 1Department of Physics & Meteorology, IIT-Kharagpur, Khara gpur 721 302, India and 2Centre for Nonlinear Dynamics, School of Physics, Bharathi das...
2009-10-20
We study the bifurcation and chaos scenario of the macro-magnetization vector in a homogeneous nanoscale-ferromagnetic thin film of the type used in spin-valve pillars. The underlying dynamics is described by a generalized Landau-Lifshitz-Gilbert (LLG) equation. The LLG equation has an especially appealing form under a...
Bifurcation and chaos in spin-valve pillars in a periodic applied magnetic field
0910.3776v1
arXiv:0910.4684v2 [physics.class-ph] 20 May 2011Two bodies gravitational system with variable mass and damping-anti damping effect due to star wind G.V. L´ opez∗and E. M. Ju´ arez Departamento de F´ ısica de la Universidad de Guadalajara, Blvd. Marcelino Garc´ ıa Barrag´ an 1421, esq. Calzada Ol´ ım pica, 44430 Guadal...
2009-10-24
We study two-bodies gravitational problem where the mass of one of the bodies varies and suffers a damping-antidamping effect due to star wind during its motion. A constant of motion, a Lagrangian and a Hamiltonian are given for the radial motion of the system, and the period of the body is studied using the constant o...
Two bodies gravitational system with variable mass and damping-antidamping effect due to star wind
0910.4684v2
Bloch oscillations in lattice potentials with controlled aperiodicity Stefan Walter,1,Dominik Schneble,1and Adam C. Durst1,y 1Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA (Dated: 25 March 2010) We numerically investigate the damping of Bloch oscillations in a one-d...
2009-11-05
We numerically investigate the damping of Bloch oscillations in a one-dimensional lattice potential whose translational symmetry is broken in a systematic manner, either by making the potential bichromatic or by introducing scatterers at distinct lattice sites. We find that the damping strongly depends on the ratio of ...
Bloch oscillations in lattice potentials with controlled aperiodicity
0911.1108v3
arXiv:0911.4628v1 [cond-mat.mes-hall] 24 Nov 2009Origin of adiabatic and non-adiabatic spin transfer torque s in current-driven magnetic domain wall motion Jun-ichiro Kishine Department of Basic Sciences, Kyushu Institute of Technolo gy, Kitakyushu, 804-8550, Japan A. S. Ovchinnikov Department of Physics, Ural State ...
2009-11-24
A consistent theory to describe the correlated dynamics of quantum mechanical itinerant spins and semiclassical local magnetization is given. We consider the itinerant spins as quantum mechanical operators, whereas local moments are considered within classical Lagrangian formalism. By appropriately treating fluctuation...
Origin of adiabatic and non-adiabatic spin transfer torques in current-driven magnetic domain wall motion
0911.4628v1
APPROXIMATE SPARSE RECOVERY: OPTIMIZING TIME AND MEASUREMENTS A. C. GILBERT, Y. LI, E. PORAT, AND M. J. STRAUSS Abstract. Anapproximate sparse recovery system consists of parameters k;N, anm-by-Nmea- surement matrix ,, and a decoding algorithm, D. Given a vector, x, the system approximates x bybx=D(x), which must sat...
2009-12-01
An approximate sparse recovery system consists of parameters $k,N$, an $m$-by-$N$ measurement matrix, $\Phi$, and a decoding algorithm, $\mathcal{D}$. Given a vector, $x$, the system approximates $x$ by $\widehat x =\mathcal{D}(\Phi x)$, which must satisfy $\| \widehat x - x\|_2\le C \|x - x_k\|_2$, where $x_k$ denotes...
Approximate Sparse Recovery: Optimizing Time and Measurements
0912.0229v1
arXiv:0912.3125v1 [gr-qc] 16 Dec 2009Toward a dynamical shift condition for unequal mass black hole binary simulations Doreen M¨ uller, Bernd Br¨ ugmann Theoretical Physics Institute, University of Jena, 07743 Jena, G ermany Abstract. Movingpuncturesimulationsofblackholebinariesrelyonaspecificgau ge choice that leads ...
2009-12-16
Moving puncture simulations of black hole binaries rely on a specific gauge choice that leads to approximately stationary coordinates near each black hole. Part of the shift condition is a damping parameter, which has to be properly chosen for stable evolutions. However, a constant damping parameter does not account fo...
Toward a dynamical shift condition for unequal mass black hole binary simulations
0912.3125v1
Page1 Strategies and tolerances of spin transfer torque switching Dmitri E. Nikonov, George I. Bourianoff Intel Corp., Components Research, Santa Clara, California, 95052 Graham Rowlands, Ilya N. Krivorotov Department of Physics and Astronomy, Univers ity of California–Irvine, Irvine, California 92697, USA dmit...
2010-01-26
Schemes of switching nanomagnetic memories via the effect of spin torque with various polarizations of injected electrons are studied. Simulations based on macrospin and micromagnetic theories are performed and compared. We demonstrate that switching with perpendicularly polarized current by short pulses and free prece...
Strategies and tolerances of spin transfer torque switching
1001.4578v1
arXiv:1003.1868v1 [cond-mat.mes-hall] 9 Mar 2010Damping of Nanomechanical Resonators Quirin P. Unterreithmeier,1,∗Thomas Faust,1and J¨ org P. Kotthaus1 1Fakult¨ at f¨ ur Physik and Center for NanoScience (CeNS), Ludwig-Maximilians-Universit¨ at, Geschwister-Scholl- Platz 1, D-80539 M¨ unchen, Germany (Dated: May 28, ...
2010-03-09
We study the transverse oscillatory modes of nanomechanical silicon nitride strings under high tensile stress as a function of geometry and mode index m <= 9. Reproducing all observed resonance frequencies with classical elastic theory we extract the relevant elastic constants. Based on the oscillatory local strain we ...
Damping of Nanomechanical Resonators
1003.1868v1
arXiv:1003.4681v1 [gr-qc] 24 Mar 2010Dynamical shift condition for unequal mass black hole binar ies Doreen M¨ uller, Jason Grigsby, Bernd Br¨ ugmann Theoretical Physics Institute, University of Jena, 07743 J ena, Germany (Dated: August 19, 2021) Certain numerical frameworks used for the evolution of bina ry black ho...
2010-03-24
Certain numerical frameworks used for the evolution of binary black holes make use of a gamma driver, which includes a damping factor. Such simulations typically use a constant value for damping. However, it has been found that very specific values of the damping factor are needed for the calculation of unequal mass bi...
Dynamical shift condition for unequal mass black hole binaries
1003.4681v1
arXiv:1003.5375v1 [math.AP] 28 Mar 2010DAMPED WAVE DYNAMICS FOR A COMPLEX GINZBURG-LANDAU EQUATION WITH LOW DISSIPATION EVELYNE MIOT Abstract. We consider a complex Ginzburg-Landau equation on RN, corresponding to a Gross-Pitaevskii equation with a small dissipation term. W e study an asymptotic regime for long-wave ...
2010-03-28
We consider a complex Ginzburg-Landau equation, corresponding to a Gross-Pitaevskii equation with a small dissipation term. We study an asymptotic regime for long-wave perturbations of constant maps of modulus one. We show that such solutions never vanish and we derive a damped wave dynamics for the perturbation.
Damped wave dynamics for a complex Ginzburg-Landau equation with low dissipation
1003.5375v1
arXiv:1003.6092v1 [cond-mat.mes-hall] 31 Mar 2010APS/123-QED Magnonic Crystal with Two-Dimensional Periodicity as a Waveguide for Spin Waves Rakesh P. Tiwari and D. Stroud Department of Physics, Ohio State University, Columbus, OH 43210 (Dated: October 29, 2021) Abstract We describe a simple method of including dissi...
2010-03-31
We describe a simple method of including dissipation in the spin wave band structure of a periodic ferromagnetic composite, by solving the Landau-Lifshitz equation for the magnetization with the Gilbert damping term. We use this approach to calculate the band structure of square and triangular arrays of Ni nanocylinder...
Magnonic Crystal with Two-Dimensional Periodicity as a Waveguide for Spin Waves
1003.6092v1
Concatenated quantum codes can attain the quantum Gilbert-Varshamov bound Yingkai Ouyang Department of Combinatorics and Optimization, Institute of Quantum Computing, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada. y3ouyang@math.uwaterloo.ca Abstract A family of quantum codes of i...
2010-04-07
A family of quantum codes of increasing block length with positive rate is asymptotically good if the ratio of its distance to its block length approaches a positive constant. The asymptotic quantum Gilbert-Varshamov (GV) bound states that there exist $q$-ary quantum codes of sufficiently long block length $N$ having f...
Concatenated quantum codes can attain the quantum Gilbert-Varshamov bound
1004.1127v6
Limit theory for planar Gilbert tessellations Tomasz Schreiberand Natalia Soja, Faculty of Mathematics & Computer Science, Nicolaus Copernicus University, Toru n, Poland, e-mail: tomeks,natas at mat.umk.pl Abstract A Gilbert tessellation arises by letting linear segments (cracks) in R2unfold in time with constant spe...
2010-04-30
A Gilbert tessellation arises by letting linear segments (cracks) in the plane unfold in time with constant speed, starting from a homogeneous Poisson point process of germs in randomly chosen directions. Whenever a growing edge hits an already existing one, it stops growing in this direction. The resulting process tes...
Limit theory for planar Gilbert tessellations
1005.0023v1
Structural, static and dynamic magnetic properties of Co 2MnGe thin films on a sapphire a-plane substrate Mohamed Belmeguenai1, Fatih Zighem2, Thierry Chauveau1, Damien Faurie1, Yves Roussigné1, Salim Mourad Chérif1, Philippe Moch1, Kurt Westerholt3and Philippe Monod4 1LPMTM, Institut Galilée, UPR 9001 CNRS, Université ...
2010-05-25
Magnetic properties of CoMnGe thin films of different thicknesses (13, 34, 55, 83, 100 and 200 nm), grown by RF sputtering at 400{\deg}C on single crystal sapphire substrates, were studied using vibrating sample magnetometry (VSM) and conventional or micro-strip line (MS) ferromagnetic resonance (FMR). Their behavior i...
Structural, static and dynamic magnetic properties of CoMnGe thin films on a sapphire a-plane substrate
1005.4595v3
Precessing vortices and antivortices in ferromagnetic elements A. Lyberatos,1S. Komineas,2and N. Papanicolaou3, 4 1Department of Materials Science,University of Crete,PO BOX 2208,71003 Heraklion,Greece 2Department of Applied Mathematics, University of Crete, 71409 Heraklion, Crete, Greece 3Department of Physics, Univer...
2010-07-20
A micromagnetic numerical study of the precessional motion of the vortex and antivortex states in soft ferromagnetic circular nanodots is presented using Landau-Lifshitz-Gilbert dynamics. For sufficiently small dot thickness and diameter, the vortex state is metastable and spirals toward the center of the dot when its ...
Precessing vortices and antivortices in ferromagnetic elements
1007.3508v1
arXiv:1008.2177v1 [cond-mat.mes-hall] 12 Aug 2010Magnetization dynamics in the inertial regime: nutation pr edicted at short time scales M.-C. Ciornei and J.-E. Wegrowe Ecole Polytechnique, LSI, CNRS and CEA/DSM/IRAMIS, Palais eau F-91128, France. J. M. Rub´ ı Departement de Fisica Fonamental, Universitat de Barcelon...
2010-08-12
The dynamical equation of the magnetization has been reconsidered with enlarging the phase space of the ferromagnetic degrees of freedom to the angular momentum. The generalized Landau-Lifshitz-Gilbert equation that includes inertial terms, and the corresponding Fokker-Planck equation, are then derived in the framework...
Magnetization dynamics in the inertial regime: nutation predicted at short time scales
1008.2177v1
arXiv:1010.1537v1 [cond-mat.mes-hall] 7 Oct 2010Power optimization for domain wall motion in ferromagnetic nanowires O. A. Tretiakov,1Y. Liu,1and Ar. Abanov1 Department of Physics & Astronomy, Texas A&M University, Co llege Station, Texas 77843-4242, USA (Dated: October 7, 2010) The current mediated domain-wall dynam...
2010-10-07
The current mediated domain-wall dynamics in a thin ferromagnetic wire is investigated. We derive the effective equations of motion of the domain wall. They are used to study the possibility to optimize the power supplied by electric current for the motion of domain walls in a nanowire. We show that a certain resonant ...
Power optimization for domain wall motion in ferromagnetic nanowires
1010.1537v1
arXiv:1101.3144v1 [math.MG] 17 Jan 2011Steiner Ratio for Riemannian Manifolds D. Cieslik, A. O. Ivanov, A. A. Tuzhilin Abstract For a metric space ( X,ρ) and any finite subset N⊂Xbyρ(SMT N) andρ(MST N) we denote respectively the lengths of a Steiner minimal tree and a minimal spanning tree with the boundary N. TheStei...
2011-01-17
The Steiner ratio characterizes the greatest possible deviation of the length of a minimal spanning tree from the length of the minimal Steiner tree. In this paper, estimates of the Steiner ratio on Riemannian manifolds are obtained. As a corollary, the Steiner ratio for flat tori, flat Klein bottles, and projective pl...
Steiner Ratio for Manifolds
1101.3144v1
arXiv:1103.1455v1 [math-ph] 8 Mar 2011Applicationof ExplicitSymplecticAlgorithmsto IntegrationofDampingOscillators TianshuLuoc, YimuGuod aInstituteofAppliedMechanics,DepartmentofMechanics,Z hejiangUniversity, Hangzhou, Zhejiang,310027,P.R.China bInstituteofAppliedMechanics,DepartmentofMechanics,Z hejiangUniversity, H...
2011-03-08
In this paper an approach is outlined. With this approach some explicit algorithms can be applied to solve the initial value problem of $n-$dimensional damped oscillators. This approach is based upon following structure: for any non-conservative classical mechanical system and arbitrary initial conditions, there exists...
Application of Explicit Symplectic Algorithms to Integration of Damping Oscillators
1103.1455v1
Spin motive forces due to magnetic vortices and domain walls M.E. Lucassen,1,G.C.F.L. Kruis,2R. Lavrijsen,2H.J.M. Swagten,2B. Koopmans,2and R.A. Duine1 1Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands 2Department of Applied Physics, Center for NanoMaterials and COB...
2011-03-30
We study spin motive forces, i.e, spin-dependent forces, and voltages induced by time-dependent magnetization textures, for moving magnetic vortices and domain walls. First, we consider the voltage generated by a one-dimensional field-driven domain wall. Next, we perform detailed calculations on field-driven vortex dom...
Spin motive forces due to magnetic vortices and domain walls
1103.5858v3
arXiv:1106.4861v1 [nlin.PS] 23 Jun 2011Ratchet effect on a relativistic particle driven by external forces Niurka R. Quintero1, Renato Alvarez-Nodarse2and Jos´ e A. Cuesta3 1Departamento de F´ ısica Aplicada I, E. S. P., Universidad de Sevilla, C/ Virgen de ´Africa 7, E-41011, Sevilla, Spain 2Departamento de An´ alisi...
2011-06-23
We study the ratchet effect of a damped relativistic particle driven by both asymmetric temporal bi-harmonic and time-periodic piecewise constant forces. This system can be formally solved for any external force, providing the ratchet velocity as a non-linear functional of the driving force. This allows us to explicitl...
Ratchet effect on a relativistic particle driven by external forces
1106.4861v1
arXiv:1106.5808v2 [cond-mat.mtrl-sci] 6 Oct 2011Stability of precessing domain walls in ferromagnetic nano wires Yan Gou1, Arseni Goussev1,2, JM Robbins1, Valeriy Slastikov1 1School of Mathematics, University of Bristol, University W alk, Bristol BS8 1TW, United Kingdom 2Max Planck Institute for the Physics of Comple...
2011-06-28
We show that recently reported precessing solution of Landau-Lifshitz-Gilbert equations in ferromagnetic nanowires is stable under small perturbations of initial data, applied field and anisotropy constant. Linear stability is established analytically, while nonlinear stability is verified numerically.
Stability of precessing domain walls in ferromagnetic nanowires
1106.5808v2
In uence of randomness and retardation on the FMR-linewidth Thomas Bose and Ste en Trimper Institute of Physics, Martin-Luther-University, D-06099 Halle, Germany (Dated: October 25, 2018) Abstract The theory predicts that the spin-wave lifetime Land the linewidth of ferromagnetic resonance Bcan be governed by random...
2011-07-04
The theory predicts that the spin-wave lifetime $\tau_L$ and the linewidth of ferromagnetic resonance $\Delta B$ can be governed by random fields and spatial memory. To that aim the effective field around which the magnetic moments perform a precession is superimposed by a stochastic time dependent magnetic field with ...
Influence of randomness and retardation on the FMR-linewidth
1107.0638v1
1Magnetization Dynamics, Throughput and Ener gy Dissipation in a Universal Multiferroic Nanomagnetic Logic Gate with Fan-in and Fan-out Mohammad Salehi Fashami1, Jayasimha Atulasimha1* and Supriyo Bandyopadhyay2 1Department of Mechanical and Nuclear Engineering, 2Department of Electrical and Computer Engineerin...
2011-08-29
The switching dynamics of a multiferroic nanomagnetic NAND gate with fan-in/fan-out is simulated by solving the Landau-Lifshitz-Gilbert (LLG) equation while neglecting thermal fluctuation effects. The gate and logic wires are implemented with dipole-coupled 2-phase (magnetostrictive/piezoelectric) multiferroic elements...
Magnetization Dynamics, Throughput and Energy Dissipation in a Universal Multiferroic Nanomagnetic Logic Gate with Fan-in and Fan-out
1108.5758v1
arXiv:1109.2465v1 [cond-mat.mes-hall] 12 Sep 2011Externally-driven transmission and collisions of domain w alls in ferromagnetic wires Andrzej Janutka∗ Institute of Physics, Wroclaw University of Technology, Wybrze˙ ze Wyspia´ nskiego 27, 50-370 Wroc/suppress law, Poland Analytical multi-domain solutions to the dynam...
2011-09-12
Analytical multi-domain solutions to the dynamical (Landau-Lifshitz-Gilbert) equation of a one-dimensional ferromagnet including an external magnetic field and spin-polarized electric current are found using the Hirota bilinearization method. A standard approach to solve the Landau-Lifshitz equation (without the Gilber...
Externally-driven transmission and collisions of domain walls in ferromagnetic wires
1109.2465v1
ACCELERATION CONTROL IN NONLINEAR VIBRATING SYSTEMS BASED ON DAMPED LEAST SQUARES V.N. Pilipchuk Wayne State University Detroit, MI 48202 November 2, 2021 Abstract A discrete time control algorithm using the damped least squares is introduced for acceleration and energy exchange controls in nonlinear vi- brating system...
2011-10-12
A discrete time control algorithm using the damped least squares is introduced for acceleration and energy exchange controls in nonlinear vibrating systems. It is shown that the damping constant of least squares and sampling time step of the controller must be inversely related to insure that vanishing the time step ha...
Acceleration Control in Nonlinear Vibrating Systems based on Damped Least Squares
1110.2811v2
arXiv:1111.4295v2 [cond-mat.mes-hall] 8 Jun 2012JournalofthePhysicalSocietyofJapan FULLPAPERS Charge and Spin Transport in MagneticTunnel Junctions: Mic roscopic Theory DaisukeMiura∗and AkimasaSakuma DepartmentofAppliedPhysics,Tohoku University Sendai980-8579 We study the charge and spin currents passing through a ma...
2011-11-18
We study the charge and spin currents passing through a magnetic tunnel junction (MTJ) on the basis of a tight-binding model. The currents are evaluated perturbatively with respect to the tunnel Hamiltonian. The charge current has the form $A[\bm M_1(t)\times\dot{\bm M}_1(t)]\cdot\bm M_2+B\dot{\bm M}_1(t)\cdot\bm M_2$,...
Charge and Spin Transport in Magnetic Tunnel Junctions: Microscopic Theory
1111.4295v2
arXiv:1111.4655v1 [math.OC] 20 Nov 2011NULL CONTROLLABILITY OF THE STRUCTURALLY DAMPED WAVE EQUATION WITH MOVING POINT CONTROL PHILIPPE MARTIN, LIONEL ROSIER, AND PIERRE ROUCHON Abstract. We investigate the internal controllability of the wave equ ation with structural damping on the one dimensional torus. We assume ...
2011-11-20
We investigate the internal controllability of the wave equation with structural damping on the one dimensional torus. We assume that the control is acting on a moving point or on a moving small interval with a constant velocity. We prove that the null controllability holds in some suitable Sobolev space and after a fi...
Null controllability of the structurally damped wave equation with moving point control
1111.4655v1
arXiv:1201.3553v1 [cond-mat.mes-hall] 17 Jan 2012Magnetic vortex echoes: application to the study of arrays o f magnetic nanostructures F. Garcia1, J.P. Sinnecker2, E.R.P. Novais2, and A.P. Guimar˜ aes2∗ 1Laborat´ orio Nacional de Luz S´ ıncrotron, 13083-970, Camp inas, SP, Brazil and 2Centro Brasileiro de Pesquisas ...
2012-01-17
We propose the use of the gyrotropic motion of vortex cores in nanomagnets to produce a magnetic echo, analogous to the spin echo in NMR. This echo occurs when an array of nanomagnets, e.g., nanodisks, is magnetized with an in-plane (xy) field, and after a time \tau a field pulse inverts the core magnetization; the ech...
Magnetic vortex echoes: application to the study of arrays of magnetic nanostructures
1201.3553v1
Current -induced motion of a transverse magnetic domain wall in the presence of spin Hall effect Soo-Man Seo1, Kyoung-Whan Kim2, Jisu Ryu2, Hyun -Woo Lee2,a), and Kyung -Jin Lee1,3,4,b) 1Department of M aterials Science and Engineering, Korea University , Seo ul 136 -701, Korea 2PCTP and Department of Physic...
2012-02-15
We theoretically study the current-induced dynamics of a transverse magnetic domain wall in bi-layer nanowires consisting of a ferromagnet on top of a nonmagnet having strong spin-orbit coupling. Domain wall dynamics is characterized by two threshold current densities, $J_{th}^{WB}$ and $J_{th}^{REV}$, where $J_{th}^{W...
Current-induced motion of a transverse magnetic domain wall in the presence of spin Hall effect
1202.3450v1
arXiv:1203.0495v2 [astro-ph.EP] 11 Oct 2013Damping-Antidamping Effect on Comets Motion G.V. L´ opez∗and E. M. Ju´ arez Departamento de F´ ısica de la Universidad de Guadalajara, Blvd. Marcelino Garc´ ıa Barrag´ an 1421, esq. Calzada Ol´ ım pica, 44430 Guadalajara, Jalisco, M´ exico PACS: 45.20.D−,45.20.3j, 45.50.Pk, 9...
2012-03-02
We make an observation about Galilean transformation on a 1-D mass variable systems which leads us to the right way to deal with mass variable systems. Then using this observation, we study two-bodies gravitational problem where the mass of one of the bodies varies and suffers a damping-antidamping effect due to star w...
Damping-Antidamping Effect on Comets Motion
1203.0495v2