publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2013-11-12 | Vertex finiteness for splittings of relatively hyperbolic groups | Consider a group G and a family $\mathcal{A}$ of subgroups of G. We say that
vertex finiteness holds for splittings of G over $\mathcal{A}$ if, up to
isomorphism, there are only finitely many possibilities for vertex stabilizers
of minimal G-trees with edge stabilizers in $\mathcal{A}$.
We show vertex finiteness when... | 1311.2835v2 |
2013-11-13 | Fokker-Planck approach to the theory of magnon-driven spin Seebeck effect | Following the theoretical approach by Xiao et al [Phys. Rev. B 81, 214418
(2010)] to the spin Seebeck effect, we calculate the mean value of the total
spin current flowing through a normalmetal/ ferromagnet interface. The spin
current emitted from the ferromagnet to the normal metal is evaluated in the
framework of the... | 1311.3117v1 |
2013-11-20 | Recent integral cross section validation measurements at the ASP facility | This work presents new integral data measured at the ASP 14 MeV neutron
irradiation facility at Aldermaston in the UK, which has recently become
available for fusion-related work through the CCFE materials programme.
Measurements of reaction products from activation experiments using elemental
foils were carried out us... | 1311.5074v1 |
2013-11-25 | Application of the Moment-SOS Approach to Global Optimization of the OPF Problem | Finding a global solution to the optimal power flow (OPF) problem is
difficult due to its nonconvexity. A convex relaxation in the form of
semidefinite programming (SDP) has attracted much attention lately as it yields
a global solution in several practical cases. However, it does not in all
cases, and such cases have ... | 1311.6370v2 |
2013-12-06 | Lazy Cops and Robbers played on Graphs | We consider a variant of the game of Cops and Robbers, called Lazy Cops and
Robbers, where at most one cop can move in any round. We investigate the
analogue of the cop number for this game, which we call the lazy cop number.
Lazy Cops and Robbers was recently introduced by Offner and Ojakian, who
provided asymptotic u... | 1312.1750v1 |
2014-01-03 | Spin-Transfer-Torque Driven Magneto-Logic Gates Using Nano Spin-Valve Pillars | We propose model magneto-logic NOR and NAND gates using a spin valve pillar,
wherein the logical operation is induced by spin-polarized currents which also
form the logical inputs. The operation is facilitated by the simultaneous
presence of a constant controlling magnetic field. The same spin-valve assembly
can also b... | 1401.0723v1 |
2014-01-17 | Diffuse Scattering on Graphs | We formulate and analyze difference equations on graphs analogous to
time-independent diffusion equations arising in the study of diffuse scattering
in continuous media. Moreover, we show how to construct solutions in the
presence of weak scatterers from the solution to the homogeneous (background
problem) using Born s... | 1401.4428v2 |
2014-01-25 | Linear Boolean classification, coding and "the critical problem" | The problem of constructing a minimal rank matrix over GF(2) whose kernel
does not intersect a given set S is considered. In the case where S is a
Hamming ball centered at 0, this is equivalent to finding linear codes of
largest dimension. For a general set, this is an instance of "the critical
problem" posed by Crapo ... | 1401.6528v3 |
2014-01-30 | Langevin spin dynamics based on ab initio calculations: numerical schemes and applications | A method is proposed to study the finite-temperature behaviour of small
magnetic clusters based on solving the stochastic Landau-Lifshitz-Gilbert
equations, where the effective magnetic field is calculated directly during the
solution of the dynamical equations from first principles instead of relying on
an effective s... | 1401.7885v2 |
2014-02-25 | Flux $1/f^α$ noise in 2D Heisenberg spin glasses: effects of weak anisotropic interactions | We study the dynamics of a two-dimensional ensemble of randomly distributed
classical Heisenberg spins with isotropic RKKY and weaker anisotropic
dipole-dipole couplings. Such ensembles may give rise to the flux noise
observed in SQUIDs with a $1/f^{\alpha}$ power spectrum ($\alpha \lesssim 1$).
We solve numerically th... | 1402.6229v2 |
2014-02-25 | Spinless Topological Insulators without Time-Reversal Symmetry | We explore the 32 crystallographic point groups and identify topological
phases of matter with robust surface modes. For n =3,4 and 6 of the C_{nv}
groups, we find the first-known 3D topological insulators without spin-orbit
coupling, and with surface modes that are protected only by point groups, i.e.,
not needing tim... | 1402.6323v1 |
2014-04-08 | Resonant Spin Wave Excitation by Terahertz Magnetic Near-field Enhanced with Split Ring Resonator | Excitation of antiferromagnetic spin waves in HoFeO$_{3}$ crystal combined
with a split ring resonator (SRR) is studied using terahertz (THz)
electromagnetic pulses. The magnetic field in the vicinity of the SRR induced
by the incident THz electric field component excites and the Faraday rotation
of the polarization of... | 1404.2179v1 |
2014-04-09 | Spin switches for compact implementation of neuron and synapse | Nanomagnets driven by spin currents provide a natural implementation for a
neuron and a synapse: currents allow convenient summation of multiple inputs,
while the magnet provides the threshold function. The objective of this paper
is to explore the possibility of a hardware neural network (HNN) implementation
using a s... | 1404.2654v2 |
2014-06-30 | Coercivity reduction in a two-dimensional array of nanoparticles | We report on theoretical investigation of the magnetization reversal in
two-dimensional arrays of ferromagnetic nano-particles with parameters of
cobalt. The system was optimized for achieving the lowest coercivity in an
array of particles located in the nodes of triangular, hexagonal and square
grids. Based on the num... | 1406.7786v1 |
2014-07-17 | Spatial ordering of nano-dislocation loops in ion-irradiated materials | Defect microstructures formed in ion-irradiated metals, for example iron or
tungsten, often exhibit patterns of spatially ordered nano-scale dislocation
loops. We show that such ordered dislocation loop structures may form
spontaneously as a result of Brownian motion of loops, biased by the
angular-dependent elastic in... | 1407.4683v1 |
2014-07-22 | Lattice swelling and modulus change in a helium-implanted tungsten alloy: X-ray micro-diffraction, surface acoustic wave measurements, and multiscale modelling | Using X-ray micro-diffraction and surface acoustic wave spectroscopy, we
measure lattice swelling and elastic modulus changes in a W-1%Re alloy after
implantation with 3110 appm of helium. A fraction of a percent observed lattice
expansion gives rise to an order of magnitude larger reduction in the surface
acoustic wav... | 1407.6051v1 |
2014-07-26 | Principles and Parameters: a coding theory perspective | We propose an approach to Longobardi's parametric comparison method (PCM) via
the theory of error-correcting codes. One associates to a collection of
languages to be analyzed with the PCM a binary (or ternary) code with one code
words for each language in the family and each word consisting of the binary
values of the ... | 1407.7169v1 |
2014-07-28 | Eddy current effects in the magnetization dynamics of ferromagnetic metal nanoparticles | We develop an analytical model for describing the magnetization dynamics in
ferromagnetic metal nanoparticles, which is based on the coupled system of the
Landau-Lifshitz-Gilbert (LLG) and Maxwell equations. By solving Maxwell's
equations in the quasi-static approximation and finding the magnetic field of
eddy currents... | 1407.7466v1 |
2014-08-02 | Standards for Graph Algorithm Primitives | It is our view that the state of the art in constructing a large collection
of graph algorithms in terms of linear algebraic operations is mature enough to
support the emergence of a standard set of primitive building blocks. This
paper is a position paper defining the problem and announcing our intention to
launch an ... | 1408.0393v1 |
2014-08-02 | McCool groups of toral relatively hyperbolic groups | The outer automorphism group Out(G) of a group G acts on the set of conjugacy
classes of elements of G. McCool proved that the stabilizer $Mc(c_1,...,c_n)$
of a finite set of conjugacy classes is finitely presented when G is free. More
generally, we consider the group $Mc(H_1,...,H_n)$ of outer automorphisms
$\Phi$ of ... | 1408.0418v1 |
2014-08-06 | The first SPIE software Hack Day | We report here on the software Hack Day organised at the 2014 SPIE conference
on Astronomical Telescopes and Instrumentation in Montreal. The first ever Hack
Day to take place at an SPIE event, the aim of the day was to bring together
developers to collaborate on innovative solutions to problems of their choice.
Such e... | 1408.1278v1 |
2014-08-07 | A broadband silicon quarter-wave retarder for far-infrared spectroscopic circular dichroism | The high brightness, broad spectral coverage and pulsed characteristics of
infrared synchrotron radiation enable time-resolved spectroscopy under
throughput-limited optical systems, as can occur with the high-field magnet
cryostat systems used to study electron dynamics and cyclotron resonance by
far-infrared technique... | 1408.1650v1 |
2014-08-12 | Probing the A1 to L10 Transformation in FeCuPt Using the First Order Reversal Curve Method | The A1- L10 phase transformation has been investigated in (001) FeCuPt thin
films prepared by atomic-scale multilayer sputtering and rapid thermal
annealing (RTA). Traditional x-ray diffraction is not always applicable in
generating a true order parameter, due to non-ideal crystallinity of the A1
phase. Using the first... | 1408.2860v1 |
2014-09-09 | Magnetization pumping and dynamics in a Dzyaloshinskii-Moriya magnet | We formulate a phenomenological description of thin ferromagnetic layers with
inversion asymmetry where the single-domain magnetic dynamics experiences
magnon current-induced torques and leads to magnon-motive forces. We first
construct a phenomenological theory based on irreversible thermodynamics,
taking into account... | 1409.2846v3 |
2014-09-17 | Communities and Hierarchical Structures in Dynamic Social Networks: Analysis and Visualization | Detection of community structures in social networks has attracted lots of
attention in the domain of sociology and behavioral sciences. Social networks
also exhibit dynamic nature as these networks change continuously with the
passage of time. Social networks might also present a hierarchical structure
led by individu... | 1409.5040v1 |
2014-09-30 | Free upper boundary value problems for the semi-geostrophic equations | The semi-geostrophic system is widely used in the modelling of large-scale
atmospheric flows. In this paper, we prove existence of solutions of the
incompressible semi-geostrophic equations in a fully three-dimensional domain
with a free upper boundary condition.
We show that, using methods similar to those introduce... | 1409.8560v3 |
2014-10-21 | Voltage Induced Dynamical Quantum Phase Transitions in Exciton Condensates | We explore non-analytic quantum phase dynamics of dipolar exciton condensates
formed in a system of 1D quantum layers subjected to voltage quenches. We map
the exciton condensate physics on to the pseudospin ferromagnet model showing
an additional oscillatory metastable and paramagnetic phase beyond the
well-known ferr... | 1410.5564v1 |
2014-10-22 | Landau-Lifshitz-Bloch equation for exchange coupled grains | Heat assisted recording is a promising technique to further increase the
storage density in hard disks. Multilayer recording grains with graded Curie
temperature is discussed to further assist the write process. Describing the
correct magnetization dynamics of these grains, from room temperature to far
above the Curie ... | 1410.6066v2 |
2014-10-22 | A three-dimensional spin-diffusion model for micromagnetics | We implement a finite-element scheme that solves the Landau-Lifshitz-Gilbert
equation coupled to a diffusion equation accounting for spin-polarized
currents. The latter solves for the spin accumulation not only in magnetic
materials but also in nonmagnetic conductors. The presented method incorporates
the model by Slon... | 1410.6067v2 |
2014-11-13 | Random geometric graphs with general connection functions | In the original (1961) Gilbert model of random geometric graphs, nodes are
placed according to a Poisson point process, and links formed between those
within a fixed range. Motivated by wireless ad-hoc networks "soft" or
"probabilistic" connection models have recently been introduced, involving a
"connection function" ... | 1411.3617v3 |
2014-11-24 | Enhancement of Spin-transfer torque switching via resonant tunneling | We propose the use of resonant tunneling as a route to enhance the
spin-transfer torque switching characteristics of magnetic tunnel junctions.
The proposed device structure is a resonant tunneling magnetic tunnel junction
based on a MgO-semiconductor heterostructure sandwiched between a fixed magnet
and a free magnet.... | 1411.6454v1 |
2014-12-22 | Langevin dynamics for vector variables driven by multiplicative white noise: a functional formalism | We discuss general multi-dimensional stochastic processes driven by a system
of Langevin equations with multiplicative white noise. In particular, we
address the problem of how time reversal diffusion processes are affected by
the variety of conventions available to deal with stochastic integrals. We
present a function... | 1412.7015v2 |
2014-12-30 | Mapping tori of free group automorphisms, and the Bieri-Neumann-Strebel invariant of graphs of groups | Let $G$ be the mapping torus of a polynomially growing automorphism of a
finitely generated free group. We determine which epimorphisms from $G$ to
$\mathbb{Z}$ have finitely generated kernel, and we compute the rank of the
kernel. We thus describe all possible ways of expressing $G$ as the mapping
torus of a free grou... | 1412.8582v1 |
2015-01-12 | Magnetic correlations beyond the Heisenberg model in an Fe monolayer on Rh(001) | Motivated by a recent experimental observation of a complex magnetic
structure [Takada et al. 2013 J. Magn. Magn. Mater. 329 95] we present a
theoretical study of the magnetic structure of an Fe monolayer deposited on
Rh(001). We use a classical spin Hamiltonian with parameters obtained from ab
initio calculations and ... | 1501.02657v1 |
2015-01-22 | Relativistic dynamical spin excitations of magnetic adatoms | We present a first-principles theory of dynamical spin excitations in the
presence of spin-orbit coupling. The broken global spin rotational invariance
leads to a new sum rule. We explore the competition between the magnetic
anisotropy energy and the external magnetic field, as well as the role of
electron-hole excitat... | 1501.05509v1 |
2015-01-23 | Tuning Range-Separated Density Functional Theory for Photocatalytic Water Splitting Systems | We discuss the system-specific optimization of long-range separated density
functional theory (DFT) for the prediction of electronic properties relevant
for a photocatalytic cycle based on an Ir(III) photosensitizer (IrPS). Special
attention is paid to the charge-transfer properties, which are of key
importance for the... | 1501.05863v2 |
2015-01-26 | Dynamics of magnon fluid in Dzyaloshinskii-Moriya magnet and its manifestation in magnon-Skyrmion scattering | We construct Holstein-Primakoff Hamiltonian for magnons in arbitrary slowly
varying spin background, for a microscopic spin Hamiltonian consisting of
ferromagnetic spin exchange,Dzyaloshinskii-Moriya exchange, and the Zeeman
term. The Gross-Pitaevskii-type equation for magnon dynamics contains several
background gauge ... | 1501.06467v1 |
2015-02-05 | Improved efficiency of heat generation in nonlinear dynamics of magnetic nanoparticles | The deterministic Landau-Lifshitz-Gilbert equation has been used to
investigate the nonlinear dynamics of magnetization and the specific loss power
in magnetic nanoparticles with uniaxial anisotropy driven by a rotating
magnetic field. We propose a new type of applied field, which is
"simultaneously rotating and altern... | 1502.01619v2 |
2015-03-10 | Microwave-induced dynamic switching of magnetic skyrmion cores in nanodots | The nonlinear dynamic behavior of a magnetic skyrmion in circular nanodots
was studied numerically by solving the Landau-Lifshitz-Gilbert equation with a
classical spin model. We show that a skyrmion core reversal can be achieved
within nanoseconds using a perpendicular oscillating magnetic field. Two
symmetric switchi... | 1503.02869v1 |
2015-03-23 | Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe | Chiral magnetic interactions induce complex spin textures including helical
and conical spin waves, as well as particle-like objects such as magnetic
skyrmions and merons. These spin textures are the basis for innovative device
paradigms and give rise to exotic topological phenomena, thus being of interest
for both app... | 1503.06622v2 |
2015-04-01 | Minimum-cost matching in a random graph with random costs | Let $G_{n,p}$ be the standard Erd\H{o}s-R\'enyi-Gilbert random graph and let
$G_{n,n,p}$ be the random bipartite graph on $n+n$ vertices, where each $e\in
[n]^2$ appears as an edge independently with probability $p$. For a graph
$G=(V,E)$, suppose that each edge $e\in E$ is given an independent uniform
exponential rate... | 1504.00312v5 |
2015-04-04 | Graphs, Matrices, and the GraphBLAS: Seven Good Reasons | The analysis of graphs has become increasingly important to a wide range of
applications. Graph analysis presents a number of unique challenges in the
areas of (1) software complexity, (2) data complexity, (3) security, (4)
mathematical complexity, (5) theoretical analysis, (6) serial performance, and
(7) parallel perf... | 1504.01039v2 |
2015-04-08 | A Global Star Forming Episode in M31 2-4 Gyr Ago | We have identified a major global enhancement of star formation in the inner
M31 disk that occurred between 2-4 Gyr ago, producing $\sim$60% of the stellar
mass formed in the past 5 Gyr. The presence of this episode in the inner disk
was discovered by modeling the optical resolved star color-magnitude diagrams
of low e... | 1504.02120v1 |
2015-04-13 | Ultra-low-energy non-volatile straintronic computing using single multiferroic composites | The primary impediment to continued downscaling of traditional charge-based
electronic devices in accordance with Moore's law is the excessive energy
dissipation that takes place in the device during switching of bits. One very
promising solution is to utilize multiferroic heterostructures, comprised of a
single-domain... | 1504.03907v1 |
2015-04-20 | Electric field-induced magnetization switching in interface-coupled multiferroic heterostructures: A highly-dense, non-volatile, and ultra-low-energy computing paradigm | Electric-field induced magnetization switching in multiferroic
magnetoelectric devices is promising for beyond Moore's law computing. We show
here that interface-coupled multiferroic heterostructures, i.e., a
ferroelectric layer coupled with a ferromagnetic layer, are particularly
suitable for highly-dense, non-volatil... | 1504.05572v1 |
2015-04-23 | Quantum Magnets and Matrix Lorenz Systems | The Landau--Lifshitz--Gilbert equations for the evolution of the
magnetization, in presence of an external torque, can be cast in the form of
the Lorenz equations and, thus, can describe chaotic fluctuations. To study
quantum effects, we describe the magnetization by matrices, that take values in
a Lie algebra. The fin... | 1504.06161v1 |
2015-04-26 | Speed of field driven domain walls in nanowires with large transverse magnetic anisotropy | Recent analytical and numerical work on field driven domain wall propagation
in nanowires has shown that for large transverse anisotropy and sufficiently
large applied fields the Walker profile becomes unstable before the breakdown
field, giving way to a slower stationary domain wall. We perform an asymptotic
expansion... | 1504.06865v1 |
2015-04-27 | New Reversal Mode in Exchange Coupled Antiferromagnetic/Ferromagnetic Disks: Distorted Viscous Vortex | Magnetic vortices have generated intense interest in recent years due to
their unique reversal mechanisms, fascinating topological properties, and
exciting potential applications. Additionally, the exchange coupling of
magnetic vortices to antiferromagnets has also been shown to lead to a range of
novel phenomena and f... | 1504.07121v1 |
2015-05-03 | Driving magnetic skyrmions with microwave fields | We show theoretically by numerically solving the Landau-Lifshitz-Gilbert
equation with a classical spin model on a two-dimensional system that both
magnetic skyrmions and skyrmion lattices can be moved with microwave magnetic
fields. The mechanism is enabled by breaking the axial symmetry of the
skyrmion, for example t... | 1505.00445v2 |
2015-05-04 | Landau-Lifshitz theory of the thermomagnonic torque | We derive the thermomagnonic torque associated with smooth magnetic textures
subjected to a temperature gradient, in the framework of the stochastic
Landau-Lifshitz-Gilbert equation. Our approach captures on equal footing two
distinct contributions: (1) A local entropic torque that is caused by a
temperature dependence... | 1505.00818v1 |
2015-05-05 | Three-dimensional Character of the Magnetization Dynamics in Magnetic Vortex Structures - Hybridization of Flexure Gyromodes with Spin Waves | Three-dimensional linear spin-wave eigenmodes of a Permalloy disk having
finite thickness are studied by micromagnetic simulations based on the
Landau-Lifshitz-Gilbert equation. The eigenmodes found in the simulations are
interpreted as linear superpositions (hybridizations) of 'approximate'
three-dimensional eigenmode... | 1505.01148v2 |
2015-05-14 | A Subset Selection Algorithm for Wireless Sensor Networks | One of the main challenges facing wireless sensor networks (WSNs) is the
limited power resources available at small sensor nodes. It is therefore
desired to reduce the power consumption of sensors while keeping the distortion
between the source information and its estimate at the fusion centre (FC) below
a specific thr... | 1505.03640v1 |
2015-05-20 | Effect of Transverse Magnetic Field on Dynamics of Current Driven Domain Wall Motion in the Presence of Spin-Hall Effect | Theoretically, we study the dynamics of a current induced domain wall in the
bi-layer structure consists of a ferromagnetic layer and a non-magnetic metal
layer with strong spin-orbit coupling in the presence of spin-Hall effect. The
analytical expressions for the velocity and width of the domain wall interms of
excita... | 1505.05249v1 |
2015-05-25 | New Explicit Binary Constant Weight Codes from Reed-Solomon Codes | Binary constant weight codes have important applications and have been
studied for many years. Optimal or near-optimal binary constant weight codes of
small lengths have been determined. In this paper we propose a new construction
of explicit binary constant weight codes from $q$-ary Reed-Solomon codes. Some
of our bin... | 1505.06524v4 |
2015-06-01 | Closing the hierarchy for non-Markovian magnetization dynamics | We propose a stochastic approach for the description of the time evolution of
the magnetization of nanomagnets, that interpolates between the
Landau--Lifshitz--Gilbert and the Landau--Lifshitz--Bloch approximations, by
varying the strength of the noise. In addition, we take into account the
autocorrelation time of the ... | 1506.00544v1 |
2015-06-02 | Spin Superfluidity in the $ν=0$ Quantum Hall State of Graphene | A proposal to detect the purported canted antiferromagnet order for the
$\nu=0$ quantum Hall state of graphene based on a two-terminal spin transport
setup is theoretically discussed. In the presence of a magnetic field normal to
the graphene plane, a dynamic and inhomogeneous texture of the N\'eel vector
lying within ... | 1506.01061v1 |
2015-06-05 | Multi-reference approach to the calculation of photoelectron spectra including spin-orbit coupling | X-ray photoelectron spectra provide a wealth of information on the electronic
structure. The extraction of molecular details requires adequate theoretical
methods, which in case of transition metal complexes has to account for effects
due to the multi-configurational and spin-mixed nature of the many-electron
wave func... | 1506.01826v1 |
2015-06-10 | Parafermionic phases with symmetry-breaking and topological order | Parafermions are the simplest generalizations of Majorana fermions that
realize topological order. We propose a less restrictive notion of topological
order in 1D open chains, which generalizes the seminal work by Fendley [J.
Stat. Mech., P11020 (2012)]. The first essential property is that the
groundstates are mutuall... | 1506.03455v1 |
2015-06-17 | Magnetic field control of the spin Seebeck effect | The origin of the suppression of the longitudinal spin Seebeck effect by
applied magnetic fields is studied. We perform numerical simulations of the
stochastic Landau-Lifshitz-Gilbert equation of motion for an atomistic spin
model and calculate the magnon accumulation in linear temperature gradients for
different stren... | 1506.05290v1 |
2015-06-18 | The pion quasiparticle in the low-temperature phase of QCD | We investigate the properties of the pion quasiparticle in the
low-temperature phase of two-flavor QCD on the lattice with support from chiral
effective theory. We find that the pion quasiparticle mass is significantly
reduced compared to its value in the vacuum, by contrast with the static
screening mass, which increa... | 1506.05732v1 |
2015-06-23 | Bounds on the Parameters of Locally Recoverable Codes | A locally recoverable code (LRC code) is a code over a finite alphabet such
that every symbol in the encoding is a function of a small number of other
symbols that form a recovering set. In this paper we derive new finite-length
and asymptotic bounds on the parameters of LRC codes. For LRC codes with a
single recoverin... | 1506.07196v2 |
2015-06-24 | From Random Matrix Theory to Coding Theory: Volume of a Metric Ball in Unitary Group | Volume estimates of metric balls in manifolds find diverse applications in
information and coding theory. In this paper, some new results for the volume
of a metric ball in unitary group are derived via various tools from random
matrix theory. The first result is an integral representation of the exact
volume, which in... | 1506.07259v1 |
2015-06-18 | Ultra-low-energy computing paradigm using giant spin Hall devices | Spin Hall effect converts charge current to spin current, which can exert
spin-torque to switch the magnetization of a nanomagnet. Recently, it is shown
that the ratio of spin current to charge current using spin Hall effect can be
made more than unity by using the areal geometry judiciously, unlike the case
of convent... | 1506.07863v1 |
2015-06-18 | Separating read and write units in multiferroic devices | Strain-mediated multiferroic composites, i.e., piezoelectric-magnetostrictive
heterostructures, hold profound promise for energy-efficient computing in
beyond Moore's law era. While reading a bit of information stored in the
magnetostrictive nanomagnets using a magnetic tunnel junction (MTJ), a material
selection issue... | 1506.07865v1 |
2015-06-26 | Estimating the Parameters of the Waxman Random Graph | The Waxman random graph is a generalisation of the simple Erd\H{o}s-R\'enyi
or Gilbert random graph. It is useful for modelling physical networks where the
increased cost of longer links means they are less likely to be built, and thus
less numerous than shorter links. The model has been in continuous use for over
two ... | 1506.07974v2 |
2015-07-07 | Rayleigh-Jeans condensation of pumped magnons in thin film ferromagnets | We show that the formation of a magnon condensate in thin ferromagnetic films
can be explained within the framework of a classical stochastic non-Markovian
Landau-Lifshitz-Gilbert equation where the properties of the random magnetic
field and the dissipation are determined by the underlying phonon dynamics. We
have num... | 1507.01717v2 |
2015-07-07 | Dynamic Reallocation Problems in Scheduling | In this paper we look at the problem of scheduling tasks on a
single-processor system, where each task requires unit time and must be
scheduled within a certain time window, and each task can be added to or
removed from the system at any time. On each operation, the system is allowed
to reschedule any tasks, but the go... | 1507.01981v2 |
2015-08-03 | Stable oscillation in spin torque oscillator excited by a small in-plane magnetic field | Theoretical conditions to excite self-oscillation in a spin torque oscillator
consisting of a perpendicularly magnetized free layer and an in-plane
magnetized pinned layer are investigated by analytically solving the
Landau-Lifshitz-Gilbert equation. The analytical relation between the current
and oscillation frequency... | 1508.00601v1 |
2015-08-07 | Spin Dynamics in Driven Composite Multiferroics | A spin dynamics approach has been used to study the behavior of the magnetic
spins and the electric pseudo-spins in a 1-D composite multiferroic chain with
a linear magneto-electric coupling at the interface. The response is
investigated with either external magnetic or electric fields driving the
system. The spin dyna... | 1508.01584v2 |
2015-08-11 | Analysis of a coupled spin drift-diffusion Maxwell-Landau-Lifshitz system | The existence of global weak solutions to a coupled spin drift-diffusion and
Maxwell-Landau-Lifshitz system is proved. The equations are considered in a
two-dimensional magnetic layer structure and are supplemented with
Dirichlet-Neumann boundary conditions. The spin drift-diffusion model for the
charge density and spi... | 1508.02660v1 |
2015-08-12 | Bounds for codes on pentagon and other cycles | The capacity of a graph is defined as the rate of exponential grow of
independent sets in the strong powers of the graph. In strong power, an edge
connects two sequences if at each position letters are equal or adjacent. We
consider a variation of the problem where edges in the power graphs are removed
among sequences ... | 1508.03020v1 |
2015-08-14 | Smoothed Analysis of Dynamic Networks | We generalize the technique of smoothed analysis to distributed algorithms in
dynamic network models. Whereas standard smoothed analysis studies the impact
of small random perturbations of input values on algorithm performance metrics,
dynamic graph smoothed analysis studies the impact of random perturbations of
the un... | 1508.03579v1 |
2015-08-16 | The Computational Power of Beeps | In this paper, we study the quantity of computational resources (state
machine states and/or probabilistic transition precision) needed to solve
specific problems in a single hop network where nodes communicate using only
beeps. We begin by focusing on randomized leader election. We prove a lower
bound on the states re... | 1508.03859v1 |
2015-09-02 | Topological dynamics and current-induced motion in a skyrmion lattice | We study the Thiele equation for current-induced motion in a skyrmion lattice
through two soluble models of the pinning potential. Comprised by a Magnus
term, a dissipative term and a pinning force, Thiele's equation resembles
Newton's law but in virtue of the topological character of the first two, it
differs signific... | 1509.00591v1 |
2015-09-02 | Thermally-Activated Phase Slips in Superfluid Spin Transport in Magnetic Wires | We theoretically study thermally-activated phase slips in superfluid spin
transport in easy-plane magnetic wires within the stochastic
Landau-Lifshitz-Gilbert phenomenology, which runs parallel to the
Langer-Ambegaokar-McCumber-Halperin theory for thermal resistances in
superconducting wires. To that end, we start by o... | 1509.00904v1 |
2015-09-11 | Comparison between a quantum kinetic theory of spin transfer dynamics in Mn doped bulk semiconductors and its Markov limit for non-zero Mn magnetization | We investigate the transfer between carrier and Mn spins due to the
s-d-exchange interaction in a Mn doped bulk semiconductor within a microscopic
quantum kinetic theory. We demonstrate that the spin transfer dynamics is
qualitatively different for components of the carrier spin parallel and
perpendicular to the Mn mag... | 1509.03479v1 |
2015-09-14 | Spectral characteristics of time resolved magnonic spin Seebeck effect | Spin Seebeck effect (SSE) holds promise for new spintronic devices with
low-energy consumption. The underlying physics, essential for a further
progress, is yet to be fully clarified. This study of the time resolved
longitudinal SSE in the magnetic insulator yttrium iron garnet (YIG) concludes
that a substantial contri... | 1509.04018v1 |
2015-09-21 | The pion quasiparticle in the low-temperature phase of QCD | We investigate the properties of the pion quasiparticle in the
low-temperature phase of two-flavor QCD on the lattice with support from chiral
effective theory. We find that the pion quasiparticle mass is significantly
reduced compared to its value in the vacuum, in contrast to the static
screening mass, which increase... | 1509.06241v1 |
2015-10-29 | On Differentially Private Online Collaborative Recommendation Systems | In collaborative recommendation systems, privacy may be compromised, as
users' opinions are used to generate recommendations for others. In this paper,
we consider an online collaborative recommendation system, and we measure
users' privacy in terms of the standard differential privacy. We give the first
quantitative a... | 1510.08546v1 |
2015-11-05 | Non-Markovian magnetization dynamics for uniaxial nanomagnets | A stochastic approach for the description of the time evolution of the
magnetization of nanomagnets is proposed, that interpolates between the
Landau-Lifshitz-Gilbert and the Landau-Lifshitz-Bloch approximations, by
varying the strength of the noise. Its finite autocorrelation time, i.e. when
it may be described as col... | 1511.01693v1 |
2015-11-06 | Colored-noise magnetization dynamics: from weakly to strongly correlated noise | Statistical averaging theorems allow us to derive a set of equations for the
averaged magnetization dynamics in the presence of colored (non-Markovian)
noise. The non-Markovian character of the noise is described by a finite
auto-correlation time, tau, that can be identified with the finite response
time of the thermal... | 1511.02008v1 |
2015-12-17 | A self-consistent spin-diffusion model for micromagnetics | We propose a three-dimensional micromagnetic model that dynamically solves
the Landau-Lifshitz-Gilbert equation coupled to the full spin-diffusion
equation. In contrast to previous methods, we solve for the magnetization
dynamics and the electric potential in a self-consistent fashion. This
treatment allows for an accu... | 1512.05519v4 |
2015-12-17 | Statics and field-driven dynamics of transverse domain walls in biaxial nanowires under uniform transverse magnetic fields | In this work, we report analytical results on transverse domain wall (TDW)
statics and field-driven dynamics in quasi one-dimensional biaxial nanowires
under arbitrary uniform transverse magnetic fields (TMFs) based on the
Landau-Lifshitz-Gilbert equation. Without axial driving fields, the static TDW
should be symmetri... | 1512.05627v2 |
2015-12-24 | Eroding dipoles and vorticity growth for Euler flows in $ \scriptstyle{\mathbb{R}}^3$ I. Axisymmetric flow without swirl | A review of analyses based upon anti-parallel vortex structures suggests that
structurally stable vortex structures with eroding circulation may offer a path
to the study of rapid vorticity growth in solutions of Euler's equations in $
\scriptstyle{\mathbb{R}}^3$. We examine here the possible formation of such a
struct... | 1512.07898v1 |
2016-01-11 | Reliable spin-transfer torque driven precessional magnetization reversal with an adiabatically decaying pulse | We show that a slowly decaying current pulse can lead to nearly deterministic
precessional switching in the presence of noise. We consider a biaxial
macrospin, with an easy axis in the plane and a hard axis out-of-the plane,
typical of thin film nanomagnets patterned into asymmetric shapes. Out-of-plane
precessional ma... | 1601.02336v1 |
2016-01-19 | Minimal Radius of Magnetic Skyrmions: Statics and Dynamics | In a broad range of applied magnetic fields and material parameters isolated
magnetic skyrmions condense into skyrmion lattices. While the geometry of
isolated skyrmions and their lattice counterparts strongly depend on field and
Dzyaloshinski-Moriya interaction, this issue has not been adequately addressed
in previous... | 1601.04898v1 |
2016-01-20 | Limited-Magnitude Error-Correcting Gray Codes for Rank Modulation | We construct Gray codes over permutations for the rank-modulation scheme,
which are also capable of correcting errors under the infinity-metric. These
errors model limited-magnitude or spike errors, for which only
single-error-detecting Gray codes are currently known. Surprisingly, the
error-correcting codes we constru... | 1601.05218v3 |
2016-01-20 | Many-body effects on graphene conductivity: Quantum Monte Carlo calculations | Optical conductivity of graphene is studied using Quantum Monte Carlo
calculations. We start from Euclidean current-current correlator and extract
$\sigma (\omega)$ from Green-Kubo relations using Backus-Gilbert method.
Calculations were performed both for long-range interactions and taking into
account only contact te... | 1601.05315v2 |
2016-02-01 | Efficient thermal energy harvesting using nanoscale magnetoelectric heterostructures | Thermomechanical cycles with a ferroelectric working substance convert heat
to electrical energy. As shown here, magnetoelectrically coupled
ferroelectric/ferromangtic composites (also called multiferroics) add new
functionalities and allow for an efficient thermal energy harvesting at room
temperature by exploiting th... | 1602.00433v1 |
2016-02-04 | A double oracle approach for minmax regret optimization problems with interval data | In this paper, we provide a generic anytime lower bounding procedure for
minmax regret optimization problems. We show that the lower bound obtained is
always at least as accurate as the lower bound recently proposed by Chassein
and Goerigk (2015). This lower bound can be viewed as the optimal value of a
linear programm... | 1602.01764v3 |
2016-02-10 | Temperature dependence of the threshold magnetic field for nucleation and domain wall propagation in an inhomogeneous structure with grain boundary | In order to study the dependence of the coercive force of sintered magnets on
temperature, nucleation and domain wall propagation at the grain boundary are
studied as rate-determining processes of the magnetization reversal phenomena
in magnets consisting of bulk hard magnetic grains contacting via grain
boundaries of ... | 1602.03285v2 |
2016-02-26 | The magnetic monopole and the separation between fast and slow magnetic degrees of freedom | The Landau-Lifshitz-Gilbert (LLG) equation that describes the dynamics of a
macroscopic magnetic moment finds its limit of validity at very short times.
The reason for this limit is well understood in terms of separation of the
characteristic time scales between slow degrees of freedom (the magnetization)
and fast degr... | 1602.08470v1 |
2016-03-01 | Instability analysis of spin torque oscillator with an in-plane magnetized free layer and a perpendicularly magnetized pinned layer | We study the theoretical conditions to excite a stable self-oscillation in a
spin torque oscillator with an in-plane magnetized free layer and a
perpendicularly magnetized pinned layer in the presence of magnetic field
pointing in an arbitrary direction. The linearized Landau-Lifshitz-Gilbert
(LLG) equation is found to... | 1603.00155v2 |
2016-03-02 | Electric-Field-Induced Spin Resonance in Antiferromagnetic Insulators: Inverse Process of the Dynamical Chiral Magnetic Effect | We propose a realization of the electric-field-induced antiferromagnetic
resonance. We consider three-dimensional antiferromagnetic insulators with
spin-orbit coupling characterized by the existence of a topological term called
the $\theta$ term. By solving the Landau-Lifshitz-Gilbert equation in the
presence of the $\... | 1603.00614v3 |
2016-03-25 | Microscopic theory of spin-orbit torques and skyrmion dynamics | We formulate a general microscopic approach to spin-orbit torques in thin
ferromagnet/heavy-metal bilayers in linear response to electric current or
electric field. The microscopic theory we develop avoids the notion of spin
currents and spin-Hall effect. Instead, the torques are directly related to a
local spin polari... | 1603.07994v2 |
2016-04-01 | Modular Anomalies in (2+1) and (3+1)-D Edge Theories | The classification of topological phases of matter in the presence of
interactions is an area of intense interest. One possible means of
classification is via studying the partition function under modular transforms,
as the presence of an anomalous phase arising in the edge theory of a
D-dimensional system under modula... | 1604.00407v1 |
2016-04-12 | Voltage-driven magnetization switching and spin pumping in Weyl semimetals | We demonstrate electrical magnetization switching and spin pumping in
magnetically doped Weyl semimetals. The Weyl semimetal is a new class of
topological semimetals, known to have nontrivial coupling between the charge
and the magnetization due to the chiral anomaly. By solving the
Landau-Lifshitz-Gilbert equation for... | 1604.03326v1 |
2016-04-29 | Current induced magnetization dynamics and magnetization switching in superconducting ferromagnetic hybrid (F$|$S$|$F) structures | We investigate the current induced magnetization dynamics and magnetization
switching in an unconventional p-wave superconductor sandwiched between two
misaligned ferromagnetic layers by numerically solving Landau-Lifshitz-Gilbert
equation modified with current induced Slonczewski's spin torque term. A
modified form of... | 1604.08704v3 |
2016-05-04 | Asymptotic behaviors of Landau-Lifshitz flows from $\Bbb R^2$ to Kähler manifolds | In this paper, we study the asymptotic behaviors of finite energy solutions
to the Landau-Lifshitz flows from $\Bbb R^2$ into K\"ahler manifolds. First, we
prove that the solution with initial data below the critical energy converges
to a constant map in the energy space as $t\to \infty$ for the compact
Riemannian surf... | 1605.01245v2 |
2016-05-04 | Phase transition and uniqueness of levelset percolation | The main purpose of this paper is to introduce and establish basic results of
a natural extension of the classical Boolean percolation model (also known as
the Gilbert disc model). We replace the balls of that model by a positive
non-increasing attenuation function $l:(0,\infty) \to (0,\infty)$ to create the
random fie... | 1605.01275v1 |
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