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2020-10-14 | Spin torque gate magnetic field sensor | Spin-orbit torque provides an efficient pathway to manipulate the magnetic
state and magnetization dynamics of magnetic materials, which is crucial for
energy-efficient operation of a variety of spintronic devices such as magnetic
memory, logic, oscillator, and neuromorphic computing. Here, we describe and
experimental... | 2010.07158v1 |
2020-11-06 | Picosecond Switching of Optomagnetic Tunnel Junctions | Perpendicular magnetic tunnel junctions are one of the building blocks for
spintronic memories, which allow fast nonvolatile data access, offering
substantial potentials to revolutionize the mainstream computing architecture.
However, conventional switching mechanisms of such devices are fundamentally
hindered by spin ... | 2011.03612v1 |
2020-12-10 | Observation of Magnetic Droplets in Magnetic Tunnel Junctions | Magnetic droplets, a class of highly non-linear magnetodynamical solitons,
can be nucleated and stabilized in nanocontact spin-torque nano-oscillators
where they greatly increase the microwave output power. Here, we experimentally
demonstrate magnetic droplets in magnetic tunnel junctions (MTJs). The droplet
nucleation... | 2012.05596v1 |
2020-12-20 | Creation of a Chiral Bobber Lattice in Helimagnet-Multilayer Heterostructures | A chiral bobber is a localized three-dimensional magnetization configuration,
terminated by a singularity. Chiral bobbers coexist with magnetic skyrmions in
chiral magnets, lending themselves to new types of skyrmion-complementary bits
of information. However, the on-demand creation of bobbers, as well as their
direct ... | 2012.10924v1 |
2021-01-10 | A Thermodynamic Core using Voltage-Controlled Spin-Orbit-Torque Magnetic Tunnel Junctions | We present a magnetic implementation of a thermodynamic computing fabric.
Magnetic devices within computing cores harness thermodynamics through its
voltage-controlled thermal stability; while the evolution of network states is
guided by the spin-orbit-torque effect. We theoretically derive the dynamics of
the cores an... | 2101.03448v3 |
2021-04-07 | Magnetic Reversal and Critical Current Transparency of CoFeB Superconductor-Ferromagnet-Superconductor Heterostructures | In this work, we show fundamental low temperature (T) magnetic and Ic
responses of a magnetic Josephson Junction (MJJ) S/F/S heterostructure - Nb/
Co56Fe24B20 /Nb. The ultra-thin Co56Fe24B20 (CFB) films (0.6-1.3 nm) were
deposited onto two separate buffer layers: 150 nm Nb/5 nm Cu and 150 nm Nb/ (1
nm Cu/0.5 nm Nb)6/1 ... | 2104.03188v1 |
2021-06-22 | Room And Cryogenic Temperature Behaviour of Magnetic Sensors Based on Gan/Si Single Saw Resonators | This work analyzes resonance frequency shift vs. the applied magnetic field
strength for GHz operating GaN/Si SAW single resonators. Magnetostrictive
elements (Ni and CoFeB) were deposited in the proximity of the interdigitated
transducers (IDTs) of the resonators (A-type structures) and also over the
IDTs, after cover... | 2106.11605v1 |
2021-08-01 | Terahertz charge and spin transport in metallic ferromagnets: the role of crystalline and magnetic order | We study the charge and spin dependent scattering in a set of CoFeB thin
films whose crystalline order is systematically enhanced and controlled by
annealing at increasingly higher temperatures. Terahertz conductivity
measurements reveal that charge transport closely follows the development of
the crystalline phase, wi... | 2108.00456v1 |
2021-11-12 | Fabrication of voltage gated spin Hall nano-oscillators | We demonstrate an optimized fabrication process for electric field (voltage
gate) controlled nano-constriction spin Hall nano-oscillators (SHNOs),
achieving feature sizes of <30 nm with easy to handle ma-N 2401 e-beam
lithography negative tone resist. For the nanoscopic voltage gates, we utilize
a two-step tilted ion b... | 2111.06957v1 |
2021-11-26 | Three-dimensional Resonant Magnetization Dynamics Unraveled by Time-Resolved Soft X-ray Laminography | The imaging of magneto-dynamical processes has been, so far, mostly a
two-dimensional business, due to the constraints of the available experimental
techniques. In this manuscript, building on the recent developments of soft
X-ray magnetic laminography, we present an experimental setup where
magneto-dynamical processes... | 2111.13533v1 |
2022-01-11 | Perpendicular magnetic tunnel junctions with multi-interface free layer | Future generations of magnetic random access memory demand magnetic tunnel
junctions that can provide simultaneously high magnetoresistance, strong
retention, low switching energy and small cell size below 10nm. Here we study
perpendicular magnetic tunnel junctions with composite free layers where
multiple ferromagnet/... | 2201.03798v1 |
2022-04-06 | Power transfer in magnetoelectric resonators | We derive an analytical model for the power transfer in a magnetoelectric
film bulk acoustic resonator consisting of a piezoelectric--magnetostrictive
bilayer. The model describes the dynamic magnetostrictive influence on the
elastodynamics via an effective frequency-dependent stiffness constant. This
allows for the ca... | 2204.03072v2 |
2022-10-03 | Voltage control of frequency, effective damping and threshold current in nano-constriction-based spin Hall nano-oscillators | Using micromagnetic simulations, we study the interplay between strongly
voltage-controlled magnetic anisotropy (VCMA), $\Delta K = \pm$200 kJ/m$^3$,
and gate width, $w=$ 10--400 nm, in voltage-gated W/CoFeB/MgO based
nano-constriction spin Hall nano-oscillators. The VCMA modifies the local
magnetic properties such tha... | 2210.01042v1 |
2022-10-11 | Thermally-generated spin current in the topological insulator Bi$_2$Se$_3$ | We complete measurements of interconversions among the full triad of thermal
gradients, charge currents, and spin currents in the topological insulator
Bi$_2$Se$_3$ by quantifying the efficiency with which thermal gradients can
generate transverse spin currents. We accomplish this by comparing the spin
Nernst magneto-t... | 2210.05636v1 |
2022-10-26 | Perpendicular magnetic anisotropy, tunneling magnetoresistance and spin-transfer torque effect in magnetic tunnel junctions with Nb layers | Nb and its compounds are widely used in quantum computing due to their high
superconducting transition temperatures and high critical fields. Devices that
combine superconducting performance and spintronic non-volatility could deliver
unique functionality. Here we report the study of magnetic tunnel junctions
with Nb a... | 2210.14969v1 |
2022-10-30 | Interplay of symmetry-conserved tunneling, interfacial oxidation and perpendicular magnetic anisotropy in CoFeB/MgO-based junctions | The interfacial oxidation level and thermodynamic properties of the MgO-based
perpendicular magnetic tunneling junctions are investigated. The
symmetry-conserved tunneling effect depends sensitively on the MgO adatom
energy during the RF sputtering, as well as the thermal stability of the
structure during the post-grow... | 2210.16734v1 |
2022-12-08 | Acoustic-Driven Magnetic Skyrmion Motion | Magnetic skyrmions have great potential for developing novel spintronic
devices. The electrical manipulation of skyrmions has mainly relied on
current-induced spin-orbit torques. A recent theoretical model suggested that
the skyrmions could be more efficiently manipulated by surface acoustic waves
(SAW), an elastic wav... | 2212.04049v1 |
2023-04-30 | Specific features of g $\approx$ 4.3 EPR line behavior in magnetic nanogranular composites | Films of metal-insulator nanogranular composites M$_x$D$_{100-x}$ with
different composition and percentage of metal and dielectric phases (M = Fe,
Co, CoFeB; D = Al$_2$O$_3$, SiO$_2$, LiNbO$_3$; x $\approx$ 15-70 at.%) are
investigated by magnetic resonance in a wide range of frequencies (f = 7-37
GHz) and temperature... | 2305.00551v1 |
2023-05-16 | Terahertz spin conductance probes of coherent and incoherent spin tunneling through MgO tunnel junctions | We study femtosecond spin currents through MgO tunneling barriers in CoFeB(2
nm)|MgO($d$)|Pt(2 nm) stacks by terahertz emission spectroscopy. To obtain
transport information independent of extrinsic experimental factors, we
determine the complex-valued spin conductance $\tilde{G}_d (\omega)$ of the MgO
layer (thickness... | 2305.09074v2 |
2023-05-18 | Observation and enhancement of room temperature bilinear magnetoelectric resistance in sputtered topological semimetal Pt3Sn | Topological semimetal materials have become a research hotspot due to their
intrinsic strong spin-orbit coupling which leads to large charge-to-spin
conversion efficiency and novel transport behaviors. In this work, we have
observed a bilinear magnetoelectric resistance (BMER) of up to 0.1 nm2A-1Oe-1
in a singlelayer o... | 2305.10720v2 |
2023-07-07 | Orbitronics: Light-induced Orbit Currents in Terahertz Emission Experiments | Orbitronics is based on the use of orbit currents as information carriers. Up
to now, orbit currents were created from the conversion of charge or spin
currents, and inversely, they could be converted back to charge or spin
currents. Here we demonstrate that orbit currents can also be generated by
femtosecond light pul... | 2307.03490v1 |
2023-09-06 | Shaping magnetization dynamics in a planar square dot by adjusting its surface anisotropy | A planar square dot is one of the simplest structures confined to three
dimensions. Despite its geometrical simplicity, the description of the spin
wave modes in this structure is not trivial due to the competition of dipolar
and exchange interactions. An additional factor that makes this description
challenging are th... | 2309.02984v1 |
2023-09-22 | Strongly Coupled Spin Waves and Surface Acoustic Waves at Room Temperature | Here, we report the observation of strong coupling between magnons and
surface acoustic wave (SAW) phonons in a thin CoFeB film constructed in an
on-chip SAW resonator by analyzing SAW phonon dispersion anticrossings. Our
device design provides the tunability of the film thickness with a fixed phonon
wavelength, which ... | 2309.12690v1 |
2023-10-20 | Visualization of skyrmion-superconducting vortex pairs in a chiral magnet-superconductor heterostructure | Magnetic skyrmions, the topological states possessing chiral magnetic
structure with non-trivial topology, have been widely investigated as a
promising candidate for spintronic devices. They can also couple with
superconducting vortices to form skyrmion-vortex pairs, hosting Majorana zero
mode which is a potential cand... | 2310.13363v1 |
2023-10-26 | On-chip all-electrical determination of the magnetoelastic coupling constant of magnetic heterostructures | We have developed an approach to determine the magnetoelastic coupling
constant of magnetic layers in thin film heterostructures. The film is formed
on a piezoelectric substrate between two interdigital transducers (IDT), a
platform often used to construct a surface acoustic wave device. With the
substrate piezoelectri... | 2310.17215v1 |
2023-12-06 | Large Non-Volatile Frequency Tuning of Spin Hall Nano-Oscillators using Circular Memristive Nano-Gates | Spin Hall nano oscillators (SHNOs) are promising candidates for neuromorphic
computing due to their miniaturized dimensions, non-linearity, fast dynamics,
and ability to synchronize in long chains and arrays. However, tuning the
individual SHNOs in large chains/arrays, which is key to implementing synaptic
control, has... | 2312.03352v2 |
2008-05-16 | The influence of intergranular interaction on the magnetization of the ensemble of oriented Stoner-Wohlfarth nanoparticles | We consider the influence of interparticle interaction on the magnetization
reversal in the oriented Stoner-Wohlfarth nanoparticles ensemble. To do so, we
solve a kinetic equation for the relaxation of the overall ensemble
magnetization to its equilibrium value in some effective mean field. Latter
field consists of ext... | 0805.2463v3 |
2009-07-22 | Quantized spin wave modes in magnetic tunnel junction nanopillars | We present an experimental and theoretical study of the magnetic field
dependence of the mode frequency of thermally excited spin waves in rectangular
shaped nanopillars of lateral sizes 60x100, 75x150, and 105x190 nm2, patterned
from MgO-based magnetic tunnel junctions. The spin wave frequencies were
measured using sp... | 0907.3792v2 |
2014-09-02 | Switching of Perpendicularly Polarized Nanomagnets with Spin Orbit Torque without an External Magnetic Field by Engineering a Tilted Anisotropy | Spin orbit torque (SOT) provides an efficient way of generating spin current
that promises to significantly reduce the current required for switching
nanomagnets. However, an in-plane current generated SOT cannot
deterministically switch a perpendicularly polarized magnet due to symmetry
reasons. On the other hand, per... | 1409.0620v3 |
2015-10-13 | Efficient metallic spintronic emitters of ultrabroadband terahertz radiation | Terahertz electromagnetic radiation is extremely useful for numerous
applications such as imaging and spectroscopy. Therefore, it is highly
desirable to have an efficient table-top emitter covering the 1-to-30-THz
window whilst being driven by a low-cost, low-power femtosecond laser
oscillator. So far, all solid-state ... | 1510.03729v2 |
2016-07-22 | The Spin Nernst effect in Tungsten | The spin Hall effect allows generation of spin current when charge current is
passed along materials with large spin orbit coupling. It has been recently
predicted that heat current in a non-magnetic metal can be converted into spin
current via a process referred to as the spin Nernst effect. Here we report the
observa... | 1607.06594v2 |
2017-09-08 | Observation of Magnetic Radial Vortex Nucleation in a Multilayer Stack with Tunable Anisotropy | Recently discovered exotic magnetic configurations, namely magnetic solitons
appearing in the presence of bulk or interfacial Dzyaloshinskii-Moriya
Interaction (i-DMI), have excited scientists to explore their potential
applications in emerging spintronic technologies such as race-track magnetic
memory, spin logic, rad... | 1709.02876v1 |
2018-03-12 | Electrical initialization of electron and nuclear spins in a single quantum dot at zero magnetic field | The emission of circularly polarized light from a single quantum dot relies
on the injection of carriers with well-defined spin polarization. Here we
demonstrate single dot electroluminescence (EL) with a circular polarization
degree up to 35% at zero applied magnetic field. The injection of spin
polarized electrons is... | 1803.04309v1 |
2018-06-20 | Current-induced modulation of interfacial Dzyaloshinskii-Moriya interaction | The Dzyaloshinskii-Moriya (DM) interaction is an antisymmetric exchange
interaction that is responsible for the emergence of chiral magnetism. The
origin of the DM interaction, however, remains to be identified albeit the
large number of studies reported on related effects. It has been recently
suggested that the DM in... | 1806.07746v2 |
2018-06-25 | Two-terminal spin-orbit torque magnetoresistive random access memory | Spin-transfer torque magnetoresistive random access memory (STT-MRAM) is an
attractive alternative to current random access memory technologies due to its
non-volatility, fast operation and high endurance. STT-MRAM does though have
limitations including the stochastic nature of the STT-switching and a high
critical swi... | 1806.09713v2 |
2018-09-14 | Femtosecond control of terahertz spin-charge conversion in ferromagnetic heterostructures | Employing electron spin instead of charge to develop spintronic devices holds
the merits of low-power consumption in information technologies. Meanwhile, the
demand for increasing speed in spintronics beyond current CMOS technology has
further triggered intensive researches for ultrafast control of spins even up
to unp... | 1809.05391v2 |
2018-11-21 | Strong Rashba-Edelstein Effect-Induced Spin-Orbit Torques in Monolayer Transition-Metal Dichalcogenide/Ferromagnet Bilayers | The electronic and optoelectronic properties of two dimensional materials
have been extensively explored in graphene and layered transition metal
dichalcogenides (TMDs). Spintronics in these two-dimensional materials could
provide novel opportunities for future electronics, for example, efficient
generation of spin cur... | 1811.08583v1 |
2020-01-15 | Nonreciprocal surface acoustic wave propagation via magneto-rotation coupling | One of the most fundamental forms of magnon-phonon interaction is an
intrinsic property of magnetic materials, the "magnetoelastic coupling". This
particular form of interaction has been the basis for describing magnetic
materials and their strain related applications, where strain induces changes
of internal magnetic ... | 2001.05135v3 |
2020-01-15 | Backward volume vs Damon-Eshbach: a travelling spin wave spectroscopy comparison | We compare the characteristics of electrically transduced Damon-Eshbach
(DESWs) and backward volume (BVSWs) configurations within the same, 30 nm
thick, ferromagnetic, CoFeB waveguide. Sub-micron U-shaped antennas are used to
deliver the necessary in-plane and out-of-plane RF fields. We measure the
spin-wave transmissi... | 2001.05221v2 |
2021-07-20 | Spin-wave dispersion measurement by variable-gap propagating spin-wave spectroscopy | Magnonics is seen nowadays as a candidate technology for energy-efficient
data processing in classical and quantum systems. Pronounced nonlinearity,
anisotropy of dispersion relations and phase degree of freedom of spin waves
require advanced methodology for probing spin waves at room as well as at mK
temperatures. Yet... | 2107.09363v1 |
2017-03-18 | Spin Based Biosensor with Hard Axis Assist for Enhanced Sensitivity | We demonstrate the influence of hard axis assist on an in-plane polarized
nanomagnet layer to greatly enhance the sensitivity of a magnetic nano particle
(MNP) based MTJ biosensor. The hard axis assist has been provided to the
sensing layer in the forms of spin Hall Effect (SHE) induced spin injected
torque and stress ... | 1704.01555v1 |
2017-04-20 | Coupled mode theory for the acoustic wave and spin wave interaction in the magphonic crystals: Propagating magnetoelastic waves | We have investigated co-directional and contra-directional couplings between
spin wave and acoustic wave in one-dimensional periodic structure (magphonic
crystal). The system consists of two ferromagnetic layers alternating in space.
We have taken into consideration materials commonly used in magnonics: yttrium
iron ga... | 1704.06118v1 |
2018-07-17 | Large anomalous Nernst effect in thin films of the Weyl semimetal Co2MnGa | The magneto-thermoelectric properties of Heusler compound thin films are very
diverse. Here, we discuss the anomalous Nernst response of Co$_2$MnGa thin
films. We systematically study the anomalous Nernst coefficient as a function
of temperature, and we show that unlike the anomalous Hall effect, the
anomalous Nernst e... | 1807.06487v1 |
2019-01-05 | Demonstration of a strain-mediated magnetoelectric write and read unit in a Co60Fe20B20/ Pb(Mg1/3Nb2/3)0.7Ti0.3O3 heterostructure | Taking advantage of the Magnetoelectric (ME) and its inverse effect, this
article demonstrates strain-mediated magnetoelectric write and read operations
simultaneously in Co60Fe20B20/ Pb(Mg1/3Nb2/3)0.7Ti0.3O3 heterostructures
without using any symmetry breaking magnetic field at room temperature. By
applying an externa... | 1901.01368v1 |
2019-01-24 | Topology-Dependent Brownian Gyromotion of a Single Skyrmion | Non-interacting particles exhibiting Brownian motion have been observed in
many occasions of sciences, such as molecules suspended in liquids, optically
trapped microbeads, and spin textures in magnetic materials. In particular, a
detailed examination of Brownian motion of spin textures is important for
designing therm... | 1901.08206v2 |
2018-02-02 | Spin wave emission by spin-orbit torque antennas | We study the generation of propagating spin waves in Ta/CoFeB waveguides by
spin-orbit torque antennas and compare them to conventional inductive antennas.
The spin-orbit torque was generated by a transverse microwave current across
the magnetic waveguide. The detected spin wave signals for an in-plane
magnetization ac... | 1802.00861v2 |
2019-02-10 | Evidence of Pure Spin-Current Generated by Spin Pumping in Interface Localized States in Hybrid Metal-Silicon-Metal Vertical Structures | Due to the difficulty to grow high quality semiconductors on ferromagnetic
metals, the study of spin diffusion transport in Si was only limited to lateral
geometry devices. In this work, by using ultra-high vacuum wafer-bonding
technique, we have successfully fabricated metal semiconductor metal
CoFeB/MgO/Si/Pt vertica... | 1902.03652v1 |
2019-02-19 | Generation and Hall effect of skyrmions enabled via using nonmagnetic point contacts | To enable functional skyrmion based spintronic devices, the controllable
generation and manipulation of skyrmions is essential. While the generation of
skyrmions by using a magnetic geometrical constriction has already been
demonstrated, this approach is difficult to combine with a subsequent
controlled manipulation of... | 1902.06954v1 |
2020-04-05 | Spin wave based tunable switch between superconducting flux qubits | Quantum computing hardware has received world-wide attention and made
considerable progress recently. YIG thin film have spin wave (magnon) modes
with low dissipation and reliable control for quantum information processing.
However, the coherent coupling between a quantum device and YIG thin film has
yet been demonstra... | 2004.02156v1 |
2020-08-14 | Spin-injection and spin-relaxation in p-doped InGaAs/GaAs quantum-dot spin light emitting diode at zero magnetic field | We report on efficient spin injection in p-doped InGaAs/GaAs quantum-dot (QD)
spin light emitting diode (spin-LED) under zero applied magnetic field. A high
degree of electroluminescence circular polarization (Pc) ~19% is measured in
remanence up to 100K. This result is obtained thanks to the combination of a
perpendic... | 2008.06407v1 |
2020-08-17 | Enhancement of spin Hall conductivity in W-Ta alloy | Generating pure spin currents via the spin Hall effect in heavy metals has
been an active topic of research in the last decade. In order to reduce the
energy required to efficiently switch neighbouring ferromagnetic layers for
applications, one should not only increase the charge- to-spin conversion
efficiency but also... | 2008.07572v1 |
2016-02-08 | External-Field-Free Spin Hall Switching of Perpendicular Magnetic Nanopillar with a Dipole-Coupled Composite Structure | Spin Hall effect (SHE) induced reversal of perpendicular magnetization has
attracted significant interest, due to its potential to lead to low power
memory and logic devices. However, the switching requires an assisted in-plane
magnetic field, which hampers its practical applications. Here, we introduce a
novel approac... | 1603.09624v2 |
2017-02-16 | Pumping laser excited spins through MgO barriers | We present a study of the tunnel magneto-Seebeck (TMS) effect in MgO based
magnetic tunnel junctions (MTJs). The electrodes consist of CoFeB with in-plane
magnetic anisotropy. The temperature gradients which generate a voltage across
the MTJs layer stack are created using laser heating. Using this method, the
temperatu... | 1702.05038v1 |
2017-02-21 | All-optical Detection of Spin Hall Angle in W/CoFeB/SiO2 Heterostructures by Varying Tungsten Layer Thickness | The development of advanced spintronics devices hinges on the efficient
generation and utilization of pure spin current. In materials with large
spin-orbit coupling, the spin Hall effect may convert charge current to pure
spin current and a large conversion efficiency, which is quantified by spin
Hall angle (SHA), is d... | 1702.06258v1 |
2019-05-27 | Unidirectional planar Hall voltages induced by surface acoustic waves in ferromagnetic thin films | The electromotive forces induced by surface acoustic waves (SAWs) are
investigated in ferromagnetic thin films. CoFeB thin films deposited on
LiNbO$_3$ substrates are patterned into Hall-bars to study the acoustoelectric
transport properties of the device. The longitudinal and transverse dc voltages
that develop in the... | 1905.11224v1 |
2020-07-23 | Electrical Detection of Light Helicity using a Quantum Dots based Hybrid Device at Zero Magnetic Field | Photon helicity-dependent photocurrent is measured at zero magnetic field on
a device based on an ensemble of InGaAs/GaAs quantum dots that are embedded
into a GaAs-based p-i-n diode. Our main goal is to take advantage of the long
electron spin relaxation time expected in these nano-objects. In these
experiments, no ex... | 2007.12054v1 |
2020-12-02 | Engineered magnetization and exchange stiffness in direct-write Co-Fe nanoelements | Media with engineered magnetization are essential building blocks in
superconductivity, magnetism and magnon spintronics. However, the established
thin-film and lithographic techniques insufficiently suit the realization of
planar components with on-demand-tailored magnetization in the lateral
dimension. Here, we demon... | 2012.01481v1 |
2021-04-05 | Analyser-free, intensity-based wide-field magneto-optical microscopy | In conventional Kerr- and Faraday microscopy the sample is illuminated with
plane-polarised light and a magnetic domain contrast is generated by an
analyser making use of the Kerr- or Faraday rotation. In this paper we
demonstrate possibilities of analyser-free magneto-optical microscopy based on
magnetisation-dependen... | 2104.01831v2 |
2021-06-29 | Spin Hall effect in a spin-1 chiral semimetal | Spin-1 chiral semimetal is a new state of quantum matter hosting
unconventional chiral fermions that extend beyond the common Dirac and Weyl
fermions. B20-type CoSi is a prototypal material that accommodates such an
exotic quasiparticle. To date, the spin transport properties in the spin-1
chiral semimetals, have not b... | 2106.15107v1 |
2021-11-13 | 360° polarization control of terahertz spintronic emitters using uniaxial FeCo/TbCo2/FeCo trilayers | Polarization control of THz light is of paramount interest for the numerous
applications offered in this frequency range. Recent developments in THz
spintronic emitters allow for a very efficient broadband emission, and
especially unique is their ability of THz polarization switching through
magnetization control of th... | 2111.07118v1 |
2022-06-07 | Non-volatile electric control of spin-orbit torques in an oxide two-dimensional electron gas | Spin-orbit torques (SOTs) have opened a novel way to manipulate the
magnetization using in-plane current, with a great potential for the
development of fast and low power information technologies. It has been
recently shown that two-dimensional electron gases (2DEGs) appearing at oxide
interfaces provide a highly effic... | 2206.03068v1 |
2022-08-09 | Growth-dependent Interlayer Chiral Exchange and Field-free Switching | Interfacial Dzyaloshinskii-Moriya interaction (DMI) has long been observed in
normal metal/ferromagnetic multilayers, enabling the formation of chiral domain
walls, skyrmions and other 2D antisymmetric spin textures confined within a
single ferromagnetic layer, while more recent works on interlayer DMI reveal
new pathw... | 2208.04492v1 |
2022-10-12 | Depth-dependent magnetic crossover in a room-temperature skyrmion-hosting multilayer | Skyrmion-hosting multilayer stacks are promising avenues for applications,
although little is known about the depth dependence of the magnetism. We
address this by reporting the results of circular dichroic resonant elastic
x-ray scattering (CD-REXS), micromagnetic simulations, and low-energy muon-spin
rotation (LE-$\m... | 2210.06070v2 |
2022-12-15 | Emulation of Neuron and Synaptic Functions in Spin-Orbit Torque Domain Wall Devices | Neuromorphic computing (NC) architecture has shown its suitability for
energy-efficient computation. Amongst several systems, spin-orbit torque (SOT)
based domain wall (DW) devices are one of the most energy-efficient contenders
for NC. To realize spin-based NC architecture, the computing elements such as
synthetic neu... | 2212.07833v1 |
2023-01-10 | Robust mutual synchronization in long spin Hall nano-oscillator chains | Mutual synchronization of N serially connected spintronic nano-oscillators
increases their coherence by a factor $N$ and their output power by $N^2$.
Increasing the number of mutually synchronized nano-oscillators in chains is
hence of great importance for better signal quality and also for emerging
applications such a... | 2301.03859v1 |
2023-02-02 | Controlling the Skyrmion Density and Size for Quantized Convolutional Neural Networks | Skyrmion devices show energy efficient and high integration data storage and
computing capabilities. Herein, we present the results of experimental and
micromagnetic investigations of the creation and stability of magnetic
skyrmions in the Ta/IrMn/CoFeB/MgO thin film system. We investigate the
magnetic-field dependence... | 2302.01390v1 |
2023-04-16 | Anomalous and Topological Hall Resistivity in Ta/CoFeB/MgO Magnetic Systems for Neuromorphic Computing Applications | Topologically protected spin textures, such as magnetic skyrmions, have the
potential for dense data storage as well as energy-efficient computing due to
their small size and a low driving current. The evaluation of the writing and
reading of the skyrmion's magnetic and electrical characteristics is a key step
toward t... | 2304.07742v1 |
2023-06-28 | Suppression of the spin waves nonreciprocity due to interfacial Dzyaloshinskii Moriya interaction by lateral confinement in magnetic nanostructures | Despite the huge recent interest towards chiral magnetism related to the
interfacial Dzyaloshinskii Moriya interaction (iDMI) in layered systems, there
is a lack of experimental data on the effect of iDMI on the spin waves
eigenmodes of laterally confined nanostructures. Here we exploit Brillouin
Light Scattering (BLS)... | 2306.16310v1 |
2023-09-27 | Impact of surface anisotropy on the spin-wave dynamics in thin ferromagnetic film | The spin-wave dynamics in the thin CoFeB film in Damon-Eshbach geometry are
studied in three cases of boundary conditions -- free boundary conditions,
symmetrical surface anisotropy, and one-sided surface anisotropy. The
analytical model created by Wolfram and De Wames was extended to include
perpendicular surface anis... | 2309.15583v1 |
2023-11-15 | Low voltage local strain enhanced switching of magnetic tunnel junctions | Strain-controlled modulation of the magnetic switching behavior in magnetic
tunnel junctions (MTJs) could provide the energy efficiency needed to
accelerate the use of MTJs in memory, logic, and neuromorphic computing, as
well as an additional way to tune MTJ properties for these applications.
State-of-the-art CoFeB-Mg... | 2311.08984v2 |
2023-11-24 | Even-in-magnetic-field part of transverse resistivity as a probe of magnetic order | The detection of a voltage transverse to both an applied current and a
magnetic field is one of the most common characterization techniques in
solid-state physics. The corresponding component of the resistivity tensor
$\rho_{ij}$ can be separated into odd and even parts with respect to the
applied magnetic field. The f... | 2311.14498v1 |
2024-03-25 | Skyrmionic device for three dimensional magnetic field sensing enabled by spin-orbit torques | Magnetic skyrmions are topologically protected local magnetic solitons that
are promising for storage, logic or general computing applications. In this
work, we demonstrate that we can use a skyrmion device based on [W/CoFeB/MgO] 1
0 multilayers for three-dimensional magnetic field sensing enabled by
spin-orbit torques... | 2403.16725v1 |
2020-09-14 | Large field-like torque in amorphous Ru2Sn3 originated from the intrinsic spin Hall effect | We investigated temperature dependent current driven spin-orbit torques in
magnetron sputtered Ru2Sn3 (4 and 10 nm) /Co20Fe60B20 (5 nm) layered structures
with in-plane magnetic anisotropy. The room temperature damping-like and
field-like spin torque efficiencies of the amorphous Ru2Sn3 films were measured
to be 0.14 +... | 2009.06711v2 |
2021-11-09 | Spintronic emitters for super-resolution in THz-spectral imaging | THz-spectroscopy is an attractive imaging tool for scientific research,
especially in life science, offering non-destructive interaction with matter
due to its low photon energies. However, wavelengths above $100{\mu}m$
principally limit its spatial resolution in the far-field by diffraction to
this regime, making it n... | 2111.05023v1 |
2010-03-24 | Dynamical shift condition for unequal mass black hole binaries | 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... | 1003.4681v1 |
2013-05-21 | Characterization and Synthesis of Rayleigh Damped Elastodynamic Networks | We consider damped elastodynamic networks where the damping matrix is assumed
to be a non-negative linear combination of the stiffness and mass matrices
(also known as Rayleigh or proportional damping). We give here a
characterization of the frequency response of such networks. We also answer the
synthesis question for... | 1305.4961v1 |
2009-05-20 | Eigenvalue asymptotics, inverse problems and a trace formula for the linear damped wave equation | 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. | 0905.3242v1 |
2002-06-27 | Initial-amplitude dependence in weakly damped oscillators | A pedagogically instructive experimental procedure is suggested for
distinguishing between different damping terms in a weakly damped oscillator,
which highclights the connection between non-linear damping and
initial-amplitude dependence. The most common damping terms such as contact
friction, air resistance, viscous ... | 0206086v1 |
2007-08-24 | Enhancement of the Gilbert damping constant due to spin pumping in noncollinear ferromagnet/nonmagnet/ferromagnet trilayer systems | We analyzed the enhancement of the Gilbert damping constant due to spin
pumping in non-collinear ferromagnet / non-magnet / ferromagnet trilayer
systems. We show that the Gilbert damping constant depends both on the
precession angle of the magnetization of the free layer and on the direction of
the magntization of the ... | 0708.3323v1 |
2007-03-12 | Quantum estimation of a damping constant | We discuss an interferometric approach to the estimation of quantum
mechanical damping. We study specific classes of entangled and separable probe
states consisting of superpositions of coherent states. Based on the assumption
of limited quantum resources we show that entanglement improves the estimation
of an unknown ... | 0703091v2 |
2023-09-20 | Evaluating Gilbert Damping in Magnetic Insulators from First Principles | Magnetic damping has a significant impact on the performance of various
magnetic and spintronic devices, making it a long-standing focus of research.
The strength of magnetic damping is usually quantified by the Gilbert damping
constant in the Landau-Lifshitz-Gilbert equation. Here we propose a
first-principles based a... | 2309.11152v1 |
2020-11-11 | Reduction of back switching by large damping ferromagnetic material | Recent studies on magnetization dynamics induced by spin-orbit torque have
revealed a weak dependence of the critical current for magnetization switching
on the damping constant of a ferromagnetic free layer. This study, however,
reveals that the damping constant nevertheless plays a key role in
magnetization switching... | 2011.05566v1 |
2007-05-14 | Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations | 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... | 0705.1990v1 |
2015-11-16 | Determination of intrinsic damping of perpendicularly magnetized ultrathin films from time resolved precessional magnetization measurements | Magnetization dynamics are strongly influenced by damping. An effective
damping constant {\alpha}eff is often determined experimentally from the
spectral linewidth of the free induction decay of the magnetization after the
system is excited to its non-equilibrium state. Such an {\alpha}eff, however,
reflects both intri... | 1511.04802v1 |
2006-06-27 | Theoretical limit of the minimal magnetization switching field and the optimal field pulse for Stoner particles | The theoretical limit of the minimal magnetization switching field and the
optimal field pulse design for uniaxial Stoner particles are investigated. Two
results are obtained. One is the existence of a theoretical limit of the
smallest magnetic field out of all possible designs. It is shown that the limit
is proportion... | 0606681v1 |
2022-02-10 | Non-stationary Anderson acceleration with optimized damping | Anderson acceleration (AA) has a long history of use and a strong recent
interest due to its potential ability to dramatically improve the linear
convergence of the fixed-point iteration. Most authors are simply using and
analyzing the stationary version of Anderson acceleration (sAA) with a constant
damping factor or ... | 2202.05295v1 |
2012-08-01 | Artificial Neural Network Based Prediction of Optimal Pseudo-Damping and Meta-Damping in Oscillatory Fractional Order Dynamical Systems | This paper investigates typical behaviors like damped oscillations in
fractional order (FO) dynamical systems. Such response occurs due to the
presence of, what is conceived as, pseudo-damping and meta-damping in some
special class of FO systems. Here, approximation of such damped oscillation in
FO systems with the con... | 1208.0318v1 |
2005-03-24 | Fast magnetization switching of Stoner particles: A nonlinear dynamics picture | The magnetization reversal of Stoner particles is investigated from the point
of view of nonlinear dynamics within the Landau-Lifshitz-Gilbert formulation.
The following results are obtained. 1) We clarify that the so-called
Stoner-Wohlfarth (SW) limit becomes exact when damping constant is infinitely
large. Under the ... | 0503594v1 |
2021-02-01 | Global existence for semilinear wave equations with scaling invariant damping in 3-D | Global existence for small data Cauchy problem of semilinear wave equations
with scaling invariant damping in 3-D is established in this work, assuming
that the data are radial and the constant in front of the damping belongs to
$[1.5, 2)$. The proof is based on a weighted $L^2-L^2$ estimate for
inhomogeneous wave equa... | 2102.00909v1 |
1997-07-23 | Riccati parameter modes from Newtonian free damping motion by supersymmetry | We determine the class of damped modes \tilde{y} which are related to the
common free damping modes y by supersymmetry. They are obtained by employing
the factorization of Newton's differential equation of motion for the free
damped oscillator by means of the general solution of the corresponding Riccati
equation toget... | 9707019v4 |
2014-01-15 | Damping of Terahertz Plasmons in Graphene Coupled with Surface Plasmons in Heavily-Doped Substrate | Coupling of plasmons in graphene at terahert (THz) frequencies with surface
plasmons in a heavily-doped substrate is studied theoretically. We reveal that
a huge scattering rate may completely damp out the plasmons, so that proper
choices of material and geometrical parameters are essential to suppress the
coupling eff... | 1401.3396v1 |
2018-03-29 | Giant resonant nonlinear damping in nanoscale ferromagnets | Magnetic damping is a key metric for emerging technologies based on magnetic
nanoparticles, such as spin torque memory and high-resolution biomagnetic
imaging. Despite its importance, understanding of magnetic dissipation in
nanoscale ferromagnets remains elusive, and the damping is often treated as a
phenomenological ... | 1803.10925v1 |
2018-02-15 | Damping's effect on the magnetodynamics of spin Hall nano-oscillators | We study the impact of spin wave damping ($\alpha$) on the auto-oscillation
properties of nano-constriction based spin Hall nano-oscillators (SHNOs). The
SHNOs are based on a 5 nm Pt layer interfaced to a 5 nm
Py$_{100-x-y}$Pt$_{x}$Ag$_{y}$ magnetic layer, where the Pt and Ag contents are
co-varied to keep the saturati... | 1802.05548v1 |
2003-09-09 | Traveling solitons in the damped driven nonlinear Schrödinger equation | The well known effect of the linear damping on the moving nonlinear
Schr\"odinger soliton (even when there is a supply of energy via the spatially
homogeneous driving) is to quench its momentum to zero. Surprisingly, the zero
momentum does not necessarily mean zero velocity. We show that two or more
parametrically driv... | 0309031v1 |
2007-08-28 | Linear frictional forces cause orbits to neither circularize nor precess | 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... | 0708.3827v3 |
2008-12-11 | Frequency-dependent Drude damping in Casimir force calculations | 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... | 0812.2209v1 |
2009-11-05 | Bloch oscillations in lattice potentials with controlled aperiodicity | 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 ... | 0911.1108v3 |
2012-05-11 | On radiative damping in plasma-based accelerators | Radiative damping in plasma-based electron accelerators is analyzed. The
electron dynamics under combined influence of the constant accelerating force
and the classical radiation reaction force is studied. It is shown that
electron acceleration cannot be limited by radiation reaction. If initially the
accelerating forc... | 1205.2436v1 |
2016-05-23 | Large time behaivor of global solutions to nonlinear wave equations with frictional and viscoelastic damping terms | In this paper, we study the Cauchy problem for a nonlinear wave equation with
frictional and viscoelastic damping terms. As is pointed out by [8], in this
combination, the frictional damping term is dominant for the viscoelastic one
for the global dynamics of the linear equation. In this note we observe that if
the ini... | 1605.07232v1 |
2021-02-28 | Stability for an inverse source problem of the damped biharmonic plate equation | This paper is concerned with the stability of the inverse source problem for
the damped biharmonic plate equation in three dimensions. The stability
estimate consists of the Lipschitz type data discrepancy and the high frequency
tail of the source function, where the latter decreases as the upper bound of
the frequency... | 2103.00461v1 |
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