publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2016-05-28 | Magnon Waves on Chains of YIG particles: Dispersion Relations, Faraday Rotation, and Power Transmission | We calculate the dispersion relations for magnon waves on a periodic chain of
spherical or cylindrical Yttrium Iron Garnet (YIG) particles. We use the
quasistatic approximation, appropriate when $kd \ll 1$, where $k$ is the wave
number and $d$ the interparticle spacing. In this regime, because of the
magnetic dipole-di... | 1605.08931v1 |
2016-06-10 | Indirect Coupling between Two Cavity Photon Systems via Ferromagnetic Resonance | We experimentally realize indirect coupling between two cavity modes via
strong coupling with the ferromagnetic resonance in Yttrium Iron Garnet (YIG).
We find that some indirectly coupled modes of our system can have a higher
microwave transmission than the individual uncoupled modes. Using a coupled
harmonic oscillat... | 1606.03469v1 |
2016-07-06 | Temperature dependence of the magnon spin diffusion length and magnon spin conductivity in the magnetic insulator yttrium iron garnet | We present a systematic study of the temperature dependence of diffusive
magnon spin transport, using a non-local device geometry. In our measurements,
we detect spin signals arising from electrical and thermal magnon generation,
and we directly extract the magnon spin diffusion length $\lambda_m$ for
temperatures from... | 1607.01506v1 |
2016-07-08 | Observation of the spin Nernst effect | The observation of the spin Hall effect triggered intense research on pure
spin current transport. With the spin Hall effect, the spin Seebeck effect, and
the spin Peltier effect already observed, our picture of pure spin current
transport is almost complete. The only missing piece is the spin Nernst
(-Ettingshausen) e... | 1607.02277v2 |
2016-07-08 | Control of magnon-photon coupling strength in a planar resonator/YIG thin film configuration | A systematic study of the coupling at room temperature between ferromagnetic
resonance (FMR) and a planar resonator is presented. The chosen magnetic
material is a ferrimagnetic insulator (Yttrium Iron Garnet: YIG) which is
positioned on top of a stop band (notch) filter based on a stub line
capacitively coupled to a 5... | 1607.02358v3 |
2016-07-13 | Surface state dominated spin-charge current conversion in topological insulator/ferromagnetic insulator heterostructures | We report the observation of ferromagnetic resonance-driven spin pumping
signals at room temperature in three-dimensional topological insulator thin
films -- Bi2Se3 and (Bi,Sb)2Te3 -- deposited by molecular beam epitaxy on
yttrium iron garnet thin films. By systematically varying the Bi2Se3 film
thickness, we show that... | 1607.03872v1 |
2016-07-25 | Damping of parametrically excited magnons in the presence of the longitudinal spin Seebeck effect | The impact of the longitudinal spin Seebeck effect (LSSE) on the magnon
damping in magnetic-insulator/nonmagnetic-metal bilayers was recently discussed
in several reports. However, results of those experiments can be blurred by
multimode excitation within the measured linewidth. In order to avoid possible
intermodal in... | 1607.07274v1 |
2016-08-08 | Reconstruction of an effective magnon mean free path distribution from spin Seebeck measurements in thin films | A thorough understanding of the mean-free-path (MFP) distribution of the
energy carriers is crucial to engineer and tune the transport properties of
materials. In this context, a significant body of work has investigated the
phonon and electron MFP distribution, however, similar studies of the magnon
MFP distribution h... | 1608.02474v3 |
2016-09-06 | Chiral charge pumping in graphene deposited on a magnetic insulator | We demonstrate that a sizable chiral charge pumping can be achieved at room
temperature in graphene/Yttrium Iron Garnet (YIG) bilayer systems. The effect,
which cannot be attributed to the ordinary spin pumping, reveals itself in the
creation of a dc electric field/voltage in graphene as a response to the
dynamic magne... | 1609.01613v2 |
2016-09-26 | Magnon Kerr effect in a strongly coupled cavity-magnon system | We experimentally demonstrate magnon Kerr effect in a cavity-magnon system,
where magnons in a small yttrium iron garnet (YIG) sphere are strongly but
dispersively coupled to the photons in a three-dimensional cavity. When the YIG
sphere is pumped to generate considerable magnons, the Kerr effect yields a
perceptible s... | 1609.07891v2 |
2016-09-24 | Optical manipulation of a magnon-photon hybrid system | We demonstrate an all-optical method for manipulating the magnetization in a
1-mm YIG (yttrium-iron-garnet) sphere placed in a $\sim0.17\,$T uniform
magnetic field. An harmonic of the frequency comb delivered by a multi-GHz
infrared laser source is tuned to the Larmor frequency of the YIG sphere to
drive magnetization ... | 1609.08147v1 |
2016-10-18 | Spin transport in antiferromagnetic NiO and magnetoresistance in Y$_3$Fe$_5$O$_{12}$/NiO/Pt structures | We have studied spin transport and magnetoresistance in yttrium iron garnet
(YIG)/NiO/Pt trilayers with varied NiO thickness. To characterize the spin
transport through NiO we excite ferromagnetic resonance in YIG with a microwave
frequency magnetic field and detect the voltage associated with the inverse
spin-Hall eff... | 1610.05760v1 |
2016-10-26 | Time-resolved measurements of surface spin-wave pulses at millikelvin temperatures | In this work, we experimentally investigate the propagation of pulsed
magnetostatic surface spin-wave (magnon) signals in an yttrium iron garnet
(YIG) waveguide at millikelvin temperatures. Our measurements are performed in
a dilution refrigerator at microwave frequencies. The excellent signal-to-noise
ratio afforded b... | 1610.08402v2 |
2016-10-27 | Spin-wave propagation in ultra-thin YIG based waveguides | Spin-wave propagation in an assembly of microfabricated 20 nm thick, 2.5
{\mu}m wide Yttrium Iron Garnet (YIG) waveguides is studied using propagating
spin-wave spectroscopy (PSWS) and phase resolved micro-focused Brillouin Light
Scattering ({\mu}-BLS) spectroscopy. We show that spin-wave propagation in 50
parallel wav... | 1610.08756v1 |
2016-10-27 | Observation of Self-Cavitating Envelope Dispersive Shock Waves in Yttrium Iron Garnet Thin Films | The formation and properties of envelope dispersive shock wave (DSW)
excitations from repulsive nonlinear waves in a magnetic film are studied.
Experiments involve the excitation of a spin-wave step pulse in a low-loss
magnetic Y$_3$Fe$_5$O$_{12}$ thin film strip, in which the spin-wave amplitude
increases rapidly, rea... | 1610.08846v3 |
2016-10-29 | Tailoring magnetic insulator proximity effects in graphene: First-principles calculations | We report a systematic first-principles investigation of the influence of
different magnetic insulators on the magnetic proximity effect induced in
graphene. Four different magnetic insulators are considered: two ferromagnetic
europium chalcogenides namely EuO and EuS and two ferrimagnetic insulators
yttrium iron garne... | 1610.09554v1 |
2016-10-31 | Strong coupling of magnons in a YIG sphere to photons in a planar superconducting resonator in the quantum limit | We report measurements of a superconducting coplanar waveguide resonator
(CPWR) coupled to a sphere of yttrium-iron garnet. The non-uniform CPWR field
allows us to excite various magnon modes in the sphere. Mode frequencies and
relative coupling strengths are consistent with theory. Strong coupling is
observed to sever... | 1610.09963v2 |
2016-11-18 | Temporal evolution of auto-oscillations in a YIG/Pt microdisc driven by pulsed spin Hall effect-induced spin-transfer torque | The temporal evolution of pulsed Spin Hall Effect - Spin Transfer Torque
(SHE-STT) driven auto-oscillations in a Yttrium Iron Garnet (YIG) / platinum
(Pt) microdisc is studied experimentally using time-resolved Brillouin Light
Scattering (BLS) spectroscopy. It is demonstrated that the frequency of the
auto-oscillations... | 1611.06054v1 |
2016-12-15 | Theory of the Spin Seebeck Effect at a Topological-Insulator/Ferromagnetic-Insulator Interface | The spin-Seebeck effect refers to voltage signals induced in metals by
thermally driven spin currents in adjacent magnetic systems. We present a
theory of the spin-Seebeck signal in the case where the conductor that supports
the voltage signal is the topologically protected two-dimensional surface-state
system at the i... | 1612.04916v3 |
2016-12-18 | Bottleneck accumulation of hybrid magneto-elastic bosons | It is known that an ensemble of magnons, quanta of spin waves, can be
prepared as a Bose gas of weakly interacting quasiparticles with conservation
of the particle number. Furthermore, the thermalization of the overpopulated
magnon gas can lead to the formation of a Bose-Einstein condensate at the
bottom of a spin-wave... | 1612.05925v1 |
2016-12-21 | Pure spin current transport in gallium doped zinc oxide | We study the flow of a pure spin current through zinc oxide by measuring the
spin Hall magnetoresistance (SMR) in thin film trilayer samples consisting of
bismuth-substituted yttrium iron garnet (Bi:YIG), gallium-doped zinc oxide
(Ga:ZnO), and platinum. We investigate the dependence of the SMR magnitude on
the thicknes... | 1612.07239v1 |
2016-12-15 | Experimental prototype of a spin-wave majority gate | Featuring low heat dissipation, devices based on spin-wave logic gates
promise to comply with increasing future requirements in information
processing. In this work, we present the experimental realization of a majority
gate based on the interference of spin waves in an Yttrium-Iron-Garnet-based
waveguiding structure. ... | 1612.07708v1 |
2017-02-03 | Quantitative investigation of the inverse Rashba-Edelstein effect in Bi/Ag and Ag/Bi on YIG | The inverse Rashba-Edelstein effect (IREE) is a spin conversion mechanism
that recently attracts attention in spintronics and condensed matter physics.
In this letter, we report an investigation of the IREE in Bi/Ag by using
ferrimagnetic insulator yttrium iron garnet (YIG). We prepared two types of
samples with opposi... | 1702.00890v1 |
2017-02-08 | Magnon-polaron transport in magnetic insulators | We theoretically study the effects of strong magnetoelastic coupling on the
transport properties of magnetic insulators. We develop a Boltzmann transport
theory for the mixed magnon-phonon modes (magnon polarons) and determine
transport coefficients and spin diffusion length. Magnon-polaron formation
causes anomalous f... | 1702.02270v1 |
2017-02-20 | Parametric pumping of spin waves by acoustic waves | The linear and nonlinear interactions between spin waves (magnons) and
acoustic waves (phonons) in magnetostrictive materials provide an exciting
opportunity for realizing novel microwave signal processing devices and
spintronic circuits. Here we demonstrate the parametric pumping of spin waves
by acoustic waves, the p... | 1702.06038v1 |
2017-02-22 | Is spin superfluidity possible in YIG films? | Recently it was suggested that stationary spin supercurrents (spin
superfluidity) are possible in the magnon condensate observed in
yttrium-iron-garnet (YIG) magnetic films under strong external pumping. Here we
analyze this suggestion. From topology of the equilibrium order parameter in
YIG one must not expect energet... | 1702.06994v2 |
2017-05-05 | Nano-patterned magnonic crystals based on ultrathin YIG films | We demonstrate a microscopic magnonic-crystal waveguide produced by
nano-patterning of a 20 nm thick film of Yttrium Iron Garnet. By using the
phase-resolved micro-focus Brillouin light scattering spectroscopy, we map the
intensity and the phase of spin waves propagating in such a periodic magnetic
structure. Based on ... | 1705.02267v1 |
2017-05-09 | Low spin wave damping in the insulating chiral magnet Cu$_{2}$OSeO$_{3}$ | Chiral magnets with topologically nontrivial spin order such as Skyrmions
have generated enormous interest in both fundamental and applied sciences. We
report broadband microwave spectroscopy performed on the insulating chiral
ferrimagnet Cu$_{2}$OSeO$_{3}$. For the damping of magnetization dynamics we
find a remarkabl... | 1705.03416v1 |
2017-06-06 | Observation of spin superfluidity: YIG magnetic films and beyond | From topology of the order parameter of the magnon condensate observed in
yttrium-iron-garnet (YIG) magnetic films one must not expect energetic barriers
making spin supercurrents metastable. But we show that some barriers of
dynamical origin are possible nevertheless until the gradient of the phase
(angle of spin prec... | 1706.01932v2 |
2017-06-11 | Absorbing boundary layers for spin wave micromagnetics | Micromagnetic simulations are used to investigate the effects of different
absorbing boundary layers (ABLs) on spin waves (SWs) reflected from the edges
of a magnetic nano-structure. We define the conditions that a suitable ABL must
fulfill and compare the performance of abrupt, linear, polynomial and tan
hyperbolic da... | 1706.03325v1 |
2017-07-20 | Bistability of Cavity Magnon Polaritons | We report the first observation of the magnon-polariton bistability in a
cavity magnonics system consisting of cavity photons strongly interacting with
the magnons in a small yttrium iron garnet (YIG) sphere. The bistable behaviors
are emerged as sharp frequency switchings of the cavity magnon-polaritons
(CMPs) and rel... | 1707.06509v2 |
2017-09-16 | Visualization of Anomalous Ettingshausen Effect in a Ferromagnetic Film: Direct Evidence of Different Symmetry from Spin Peltier Effect | Spatial distribution of temperature modulation due to anomalous Ettingshausen
effect (AEE) is visualized in a ferromagnetic FePt thin film with in-plane and
out-of-plane magnetizations using the lock-in thermography technique. Comparing
the AEE of FePt with the spin Peltier effect (SPE) of a Pt / yttrium iron
garnet ju... | 1709.05449v1 |
2017-10-11 | Approaching quantum anomalous Hall effect in proximity-coupled YIG/graphene/h-BN sandwich structure | Quantum anomalous Hall state is expected to emerge in Dirac electron systems
such as graphene under both sufficiently strong exchange and spin-orbit
interactions. In pristine graphene, neither interaction exists; however, both
interactions can be acquired by coupling graphene to a magnetic insulator (MI)
as revealed by... | 1710.04179v1 |
2017-10-18 | Strong Coupling of 3D Cavity Photons to Travelling Magnons At Low Temperatures | We demonstrate strong coupling between travelling magnons in an Yttrium Iron
Garnet film and 3D microwave cavity photons at milli-Kelvin temperatures. The
coupling strength of $350$MHz or $7.3$\% of resonance frequency is observed.
The magnonic subsystem is represented by the Damon-Eshbach magnetostatic
surface wave wi... | 1710.06601v1 |
2017-11-01 | Spin current noise of the spin Seebeck effect and spin pumping | We theoretically investigate the fluctuation of a pure spin current induced
by the spin Seebeck effect and spin pumping in a normal metal (NM)/ferromagnet
(FM) bilayer system. Starting with a simple FI--NM interface model with both
spin-conserving and spin-non-conserving processes, we derive general
expressions of the ... | 1711.00237v2 |
2017-11-02 | Measurement of a Magnonic Crystal at Millikelvin Temperatures | Hybrid systems combining magnons and superconducting quantum circuits have
attracted increasing interest in recent years. Magnonic crystals (MCs) are one
of the building blocks of room-temperature magnonics and can be used to create
devices with an engineered band structure. These devices, exhibiting tunable
frequency ... | 1711.00958v2 |
2017-12-07 | Spin waves in coupled YIG/Co heterostructures | We investigate yttrium iron garnet (YIG)/cobalt (Co) heterostructures using
broadband ferromagnetic resonance (FMR). We observe an efficient excitation of
perpendicular standing spin waves (PSSWs) in the YIG layer when the resonance
frequencies of the YIG PSSWs and the Co FMR line coincide. Avoided crossings of
YIG PSS... | 1712.02561v1 |
2018-03-30 | From Kinetic Instability to Bose-Einstein Condensation and Magnon Supercurrents | Evolution of an overpopulated gas of magnons to a Bose-Einstein condensate
and excitation of a magnon supercurrent, propelled by a phase gradient in the
condensate wave function, can be observed at room-temperature by means of the
Brillouin light scattering spectroscopy in an yttrium iron garnet material. We
study thes... | 1803.11548v1 |
2018-04-03 | Selection rules for cavity-enhanced Brillouin light scattering from magnetostatic modes | We experimentally identify the magnetostatic modes active for Brillouin light
scattering in the optical whispering gallery modes of a yttrium iron garnet
sphere. Each mode is identified by magnetic field dispersion of
ferromagnetic-resonance spectroscopy and coupling strength to the known field
distribution of the micr... | 1804.00965v2 |
2018-04-08 | Optical cooling of magnons | Inelastic scattering of light by spin waves generates an energy flow between
the light and magnetization fields, a process that can be enhanced and
controlled by concentrating the light in magneto-optical resonators. Here, we
model the cooling of a sphere made of a magnetic insulator, such as yttrium
iron garnet (YIG),... | 1804.02683v1 |
2018-04-10 | Microwave cavity tuned with liquid metal and its application to Electron Paramagnetic Resonance | This note presents a method to tune the resonant frequency $f_{0}$ of a
rectangular microwave cavity. This is achieved using a liquid metal, GaInSn, to
decrease the volume of the cavity. It is possible to shift $f_{0}$ by filling
the cavity with this alloy, in order to reduce the relative distance between
the internal ... | 1804.03443v1 |
2018-04-12 | Spin colossal magnetoresistance in an antiferromagnetic insulator | Colossal magnetoresistance (CMR) refers to a large change in electrical
conductivity induced by a magnetic field in the vicinity of a metal-insulator
transition and has inspired extensive studies for decades\cite{Ramirez1997,
Tokura2006}. Here we demonstrate an analogous spin effect near the N\'eel
temperature $T_{\rm{... | 1804.04516v1 |
2018-04-30 | Single-Nitrogen-vacancy-center quantum memory for a superconducting flux qubit mediated by a ferromagnet | We propose a quantum memory scheme to transfer and store the quantum state of
a superconducting flux qubit (FQ) into the electron spin of a single
nitrogen-vacancy (NV) center in diamond via yttrium iron garnet (YIG), a
ferromagnet. Unlike an ensemble of NV centers, the YIG moderator can enhance
the effective FQ-NV-cen... | 1804.11231v1 |
2018-05-29 | Efficient injection and detection of out-of-plane spins via the anomalous spin Hall effect in permalloy nanowires | We report a novel mechanism for the electrical injection and detection of
out-of-plane spin accumulation via the anomalous spin Hall effect (ASHE), where
the direction of the spin accumulation can be controlled by manipulating the
magnetization of the ferromagnet. This mechanism is distinct from the spin Hall
effect (S... | 1805.11575v1 |
2018-06-12 | Resonant spin wave excitation in magnetoplasmonic bilayers by short laser pulses | In magnetically ordered solids a static magnetic field can be generated by
virtue of the transverse magneto-optical Kerr effect (TMOKE). Moreover, the
latter was shown to be dramatically enhanced due to the optical excitation of
surface plasmons in nanostructures with relatively small optical losses. In
this paper we s... | 1806.04764v1 |
2018-06-27 | Boltzmann approach to the longitudinal spin Seebeck effect | We develop a Boltzmann transport theory of coupled magnon-phonon transport in
ferromagnetic insulators. The explicit treatment of the magnon-phonon coupling
within the Boltzmann approach allows us to calculate the low-temperature
magnetic-field dependence of the spin-Seebeck voltage. Within the Boltzmann
theory we find... | 1806.10445v1 |
2018-07-03 | Spin pinning and spin-wave dispersion in nanoscopic ferromagnetic waveguides | Spin waves are investigated in Yttrium Iron Garnet (YIG) waveguides with a
thickness of 39 nm and widths ranging down to 50 nm, i.e., with aspect ratios
thickness over width approaching unity, using Brillouin Light Scattering
spectroscopy. The experimental results are verified by a semi-analytical theory
and micromagne... | 1807.01358v3 |
2018-07-23 | Bias dependent spin injection into graphene on YIG through bilayer hBN tunnel barriers | We study the spin injection efficiency into single and bilayer graphene on
the ferrimagnetic insulator Yttrium-Iron-Garnet (YIG) through an exfoliated
tunnel barrier of bilayer hexagonal boron nitride (hBN). The contacts of two
samples yield a resistance-area product between 5 and 30 k$\Omega\mu$m$^2$.
Depending on an ... | 1807.08481v1 |
2018-07-24 | Enhanced magnon spin transport in NiFe$_2$O$_4$ thin films on a lattice-matched substrate | We investigate magnon spin transport in epitaxial nickel ferrite
(NiFe$_2$O$_4$, NFO) films grown on magnesium gallate spinel (MgGa$_2$O$_4$,
MGO) substrates, which have a lattice mismatch with NFO as small as 0.78%,
resulting in the reduction of antiphase boundary defects and thus in improved
magnetic properties in th... | 1807.09013v1 |
2018-10-01 | Stabilizing Mechanism for Bose-Einstein Condensation of Interacting Magnons in Ferrimagnets and Ferromagnets | We propose a stabilizing mechanism for the Bose-Einstein condensation (BEC)
of interacting magnons in ferrimagnets and ferromagnets. By studying the
effects of the magnon-magnon interaction on the stability of the magnon BEC in
a ferrimagnet and two ferromagnets, we show that the magnon BEC remains stable
even in the p... | 1810.00584v2 |
2018-10-17 | Conventional magnon BEC in YIG film | The conventional magnon Bose-Einstein condensation (BEC of magnons with k =
0) is a coherent state of excited magnons described by a common wave function.
It was observed first in antiferromagnetic superfluid states of 3He. Here we
report on the discovery of a very similar magnon BEC in ferrimagnetic film at
room tempe... | 1810.08051v2 |
2018-10-23 | Higher-order exceptional point in a cavity magnonics system | We propose to realize the pseudo-Hermiticity in a cavity magnonics system
consisting of the Kittel modes in two small yttrium-iron-garnet spheres coupled
to a microwave cavity mode. The effective gain of the cavity can be achieved
using the coherent perfect absorption of the two input fields fed into the
cavity. With c... | 1810.09689v3 |
2018-10-27 | Microwave control of thermal magnon spin transport | We observe that an rf microwave field strongly influences the transport of
incoherent thermal magnons in yttrium iron garnet. Ferromagnetic resonance in
the nonlinear regime suppresses thermal magnon transport by 95%. The transport
is also modulated at non-resonant conditions in two cases, both related to the
magnon ba... | 1810.11667v1 |
2018-11-14 | Tunable space-time crystal in room-temperature magnetodielectrics | We report the experimental realization of a space-time crystal with tunable
periodicity in time and space in the magnon Bose-Einstein Condensate (BEC),
formed in a room-temperature Yttrium Iron Garnet (YIG) film by radio-frequency
space-homogeneous magnetic field. The magnon BEC is prepared to have a well
defined frequ... | 1811.05801v1 |
2018-11-14 | Anomalous Hall-like transverse magnetoresistance in Au thin films on Y$_3$Fe$_5$O$_{12}$ | Anomalous Hall-like signals in platinum in contact with magnetic insulators
are common observations that could be explained by either proximity
magnetization or spin Hall magnetoresistance. In this work, longitudinal and
transverse magnetoresistances are measured in a pure gold thin film on the
ferrimagnetic insulator ... | 1811.05848v1 |
2018-12-04 | Spin transport in a magnetic insulator with zero effective damping | Applications based on spin currents strongly profit from the control and
reduction of their effective damping and their transport properties. We here
experimentally observe magnon mediated transport of spin (angular) momentum
through a 13.4 nm thin yttrium iron garnet film with full control of the
magnetic damping via ... | 1812.01334v3 |
2019-01-08 | Microscopic theory of spin transport at the interface between the superconductor and a ferromagnetic insulator | We theoretically investigate spin transport at the interface between the
ferromagnetic insulator(FI) and a superconductor(SC). Considering a simple
FI-SC interface model, we derive formulas for the spin current and spin-current
noise induced by microwave irradiation (spin pumping) or the temperature
gradient (the spin ... | 1901.02440v2 |
2019-01-26 | Chiral excitation of spin waves in ferromagnetic films | We theoretically investigate the interlayer dipolar and exchange couplings
for an array of metallic magnetic nanowires grown on top of an extended
ultrathin yttrium iron garnet film. The calculated interlayer dipolar coupling
agrees with observed anticrossings [Chen \emph{et al.}, Phys. Rev. Lett.
\textbf{120}, 217202 ... | 1901.09182v1 |
2019-01-29 | Low-impedance superconducting microwave resonators for strong coupling to small magnetic mode volumes | Recent experiments on strongly coupled microwave and ferromagnetic resonance
modes have focused on large volume bulk crystals such as yttrium iron garnet,
typically of millimeter-scale dimensions. We extend these experiments to lower
volumes of magnetic material by exploiting low-impedance lumped-element
microwave reso... | 1901.10395v1 |
2019-01-30 | Surface dynamics of rough magnetic films | The chirality of Damon-Eshbach (DE) magnons affects the transport of energy
and angular momentum at the surface of magnetic films and spheres. We calculate
the surface-disorder-limited dephasing and transport lifetimes of surface modes
of sufficiently thick high-quality magnetic films such as yttrium iron garnet.
In sp... | 1901.11046v2 |
2019-02-12 | Characterization of spin wave propagation in (111) YIG thin films with large anisotropy | We report on long-range spin wave (SW) propagation in nanometer-thick yttrium
iron garnet (YIG) film with an ultralow Gilbert damping. The knowledge of a
wavenumber value $|\vec{k}|$ is essential for designing SW devices. Although
determining the wavenumber $|\vec{k}|$ in experiments like Brillouin light
scattering spe... | 1902.04608v1 |
2019-03-01 | Indirect observation of phase conjugate magnons from non-degenerate four-wave mixing | A phase conjugate mirror utilising four-wave mixing in a magnetic system is
experimentally realised for the first time. Indirect evidence of
continuous-wave phase conjugation has been observed experimentally and is
supported by simulations. The experiment utilizes a pump-probe method to excite
a four-wave mixing proces... | 1903.00400v1 |
2019-03-05 | Optimal mode matching in cavity optomagnonics | Inelastic scattering of photons is a promising technique to manipulate
magnons but it suffers from weak intrinsic coupling. We theoretically discuss
an idea to increase optomagnonic coupling in optical whispering gallery mode
cavities, by generalizing previous analysis to include the exchange
interaction. We predict th... | 1903.01718v2 |
2019-03-09 | Theory of the magnon Kerr effect in cavity magnonics | We develop a theory for the magnon Kerr effect in a cavity magnonics system,
consisting of magnons in a small yttrium iron garnet (YIG) sphere strongly
coupled to cavity photons, and use it to study the bistability in this hybrid
system. To have a complete picture of the bistability phenomenon, we analyze
two different... | 1903.03754v1 |
2019-03-29 | Quantum Simulation of the Fermion-Boson Composite Quasi-Particles with a Driven Qubit-Magnon Hybrid Quantum System | We experimentally demonstrate strong coupling between the ferromagnetic
magnons in a small yttrium-iron-garnet (YIG) sphere and the drive-field-induced
dressed states of a superconducting qubit, which gives rise to the double
dressing of the superconducting qubit. The YIG sphere and the superconducting
qubit are embedd... | 1903.12498v1 |
2019-04-08 | Quantum entanglement between two magnon modes via Kerr nonlinearity | We propose a scheme to entangle two magnon modes via Kerr nonlinear effect
when driving the systems far-from-equilibrium. We consider two macroscopic
yttrium iron garnets (YIGs) interacting with a single-mode microcavity through
the magnetic dipole coupling. The Kittel mode describing the collective
excitations of larg... | 1904.04167v1 |
2019-04-09 | Ferromagnetic Resonance Studies of Strain tuned Bi:YIG Films | Bismuth-doped Yttrium iron garnet (Bi:YIG) thin films known for large
Magneto-optical activity with low losses still needs to get probed for its
magnetization dynamics. We demonstrate a controlled tuning of
magnetocrystalline anisotropy in Bi-doped Y_3 Fe_5 O_12 (Bi:YIG) films of high
crystalline quality using growth i... | 1904.04800v2 |
2019-04-23 | Current-induced switching of YIG/Pt bilayers with in-plane magnetization due to Oersted fields | We report on the switching of the in-plane magnetization of thin yttrium iron
garnet (YIG)/Pt bilayers induced by an electrical current. The switching is
either field-induced and assisted by a dc current, or current-induced and
assisted by a static magnetic field. The reversal of the magnetization occurs
at a current d... | 1904.10517v1 |
2019-05-20 | Quantum drives produce strong entanglement between YIG samples without using intrinsic nonlinearities | We show how to generate an entangled pair of yttrium iron garnet (YIG)
samples in a cavity-magnon system without using any nonlinearities which are
typically very weak. This is against the conventional wisdom which necessarily
requires strong Kerr like nonlinearity. Our key idea, which leads to
entanglement, is to driv... | 1905.07884v2 |
2019-05-28 | Broadband enhancement of the magneto-optical activity of hybrid Au loaded Bi:YIG | We unravel the underlying near-field mechanism of the enhancement of the
magneto-optical activity of bismuth-substituted yttrium iron garnet films
(Bi:YIG) loaded with gold nanoparticles. The experimental results show that the
embedded gold nanoparticles lead to a broadband enhancement of the
magneto-optical activity w... | 1905.11941v1 |
2019-05-31 | Detecting Light Dark Matter with Magnons | Scattering of light dark matter with sub-eV energy deposition can be detected
with collective excitations in condensed matter systems. When dark matter has
spin-independent couplings to atoms or ions, it has been shown to efficiently
excite phonons. Here we show that, if dark matter couples to the electron spin,
magnon... | 1905.13744v2 |
2019-06-04 | Thickness dependence of spin Peltier effect visualized by thermal imaging technique | Magnon propagation length in a ferrimagnetic insulator yttrium iron garnet
(YIG) has been investigated by measuring and analyzing the YIG-thickness t_YIG
dependence of the spin Peltier effect (SPE) in a Pt/YIG junction system. By
means of the lock-in thermography technique, we measured the spatial
distribution of the S... | 1906.01560v3 |
2019-06-11 | Proximity magnetoresistance in graphene induced by magnetic insulators | We demonstrate the existence of Giant proximity magnetoresistance (PMR)
effect in a graphene spin valve where spin polarization is induced by a nearby
magnetic insulator. PMR calculations were performed for yttrium iron garnet
(YIG), cobalt ferrite (CFO), and two europium chalcogenides EuO and EuS. We
find a significan... | 1906.04469v1 |
2019-06-24 | Macroscopic entanglement of two magnon modes via quantum correlated microwave fields | We present a scheme to entangle two magnon modes in two macroscopic
yttrium-iron-garnet spheres. The two spheres are placed inside two microwave
cavities, which are driven by a two-mode squeezed microwave field. By using the
linear state-swap interaction between the cavity and the magnon mode in each
cavity, the quantu... | 1906.09921v1 |
2019-06-30 | Large spatial Schrodinger cat using a levitated ferrimagnetic nanoparticle | The superposition principle is one of the main tenets of quantum mechanics.
Despite its counter-intuitiveness, it has been experimentally verified using
electrons, photons, atoms, and molecules. However, a similar experimental
demonstration using a nano or a micro particle is non-existent. Here in this
Letter, exploiti... | 1907.00415v4 |
2019-07-15 | Tuning edge localized spin waves in magnetic microstripes by proximate magnetic structures | The propagation of edge localized spin waves (E-SWs) in yttrium iron garnet
(YIG) microstripes with/without the proximate magnetic microstructures is
investigated by micromagnetic simulations. A splitting of the dispersion curve
with the presence of permalloy (Py) stripe is also observed. The E-SWs on the
two edges of ... | 1907.06718v1 |
2019-07-20 | Magnon Bose-Einstein condensate and supercurrents over a wide temperature range | Magnon Bose-Einstein Condensates (BECs) and supercurrents are coherent
quantum phenomena, which appear on a macroscopic scale in parametrically
populated solid state spinsystems. One of the most fascinating and attractive
features of these processes is the possibility of magnon condensation and
supercurrent excitation ... | 1907.08805v1 |
2019-08-01 | Universal prethermal dynamics in Heisenberg ferromagnets | We study the universal far from equilibrium dynamics of magnons in Heisenberg
ferromagnets. We show that such systems exhibit universal scaling in momentum
and time of the quasiparticle distribution function, with the universal
exponents distinct from those recently observed in Bose-Einstein condensates.
This new unive... | 1908.00554v2 |
2019-08-30 | Amplitude and Phase Noise of Magnons | The low-frequency amplitude and phase noise spectra of magnetization waves,
i.e. magnons, was measured in the yttrium iron garnet (YIG) waveguides. This
type of noise, which originates from the fluctuations of the physical
properties of the YIG crystals, has to be taken into account in the design of
YIG-based RF genera... | 1909.00085v1 |
2019-09-27 | Thermally driven two-magnet nano-oscillator with large spin-charge conversion | Next-generation spintronic applications require material properties that can
be hardly met by one material candidate. Here we demonstrate that by combining
insulating and metallic magnets, enhanced spin-charge conversion and
energy-efficient thermal spin currents can be realized. We develop a nanowire
device consisting... | 1909.12445v1 |
2019-10-16 | Spin-Wave frequency division multiplexing in an yttrium iron garnet microstripe magnetized by inhomogeneous field | Spin waves are promising candidates for information processing and
transmission in a broad frequency range. In the realization of magnonic
devices, the frequency depended division of the spin wave frequencies is a
critical function for parallel information processing. In this work, we
demonstrate a proof-of-concept spi... | 1910.07136v1 |
2019-10-23 | Electrical manipulation of spin pumping signal through nonlocal thermal magnon transport | We study the magnon transport in the nonlocal configuration composed of two
Pt strips on top of yttrium iron garnet, with and without the presence of RF
microwave generated by an on-chip antenna. We find that the spin-Hall induced
thermal magnon heating/cooling, the Oersted field as well as the Joule heating
generated ... | 1910.10326v2 |
2019-10-24 | Resources of nonlinear cavity magnonics for quantum information | We theoretically explore nonlinearities of ferromagnets in microwave cavities
in the classical and quantum regimes, and assess the resources for quantum
information, i.e. fluctuation squeezing and bipartite entanglement. The
(semi-)classical analysis of the anharmonic oscillator (Duffing) model for the
Kittel mode when... | 1910.11130v1 |
2019-10-29 | Transient response of spin Peltier effect revealed by lock-in thermoreflectance measurement | Transient response of the spin Peltier effect (SPE) in a Pt/yttrium iron
garnet junction system has been investigated by means of a lock-in
thermoreflectance method. We applied an alternating charge current to the Pt
layer to drive SPE through the spin Hall effect, and measured the AC response
of the resultant SPE-indu... | 1910.13165v2 |
2019-10-30 | Strong coupling-enabled broadband non-reciprocity | Non-reciprocity of signal transmission enhances capacity of communication
channels and protects transmission quality against possible signal
instabilities, thus becoming an important component ensuring coherent
information processing. However, non-reciprocal transmission requires breaking
time-reversal symmetry (TRS) w... | 1910.14117v2 |
2019-10-31 | Coherent spin pumping in a strongly coupled magnon-magnon hybrid system | We experimentally identify coherent spin pumping in the magnon-magnon hybrid
modes of permalloy/yttrium iron garnet (Py/YIG) bilayers. Using broadband
ferromagnetic resonance, an "avoided crossing" is observed between the uniform
mode of Py and the spin wave mode of YIG due to the fieldlike interfacial
exchange couplin... | 1910.14470v2 |
2019-11-09 | The magnonic superfluid droplet at room temperature | We declare the observation of spin superfluid state in Yttrium Iron Garnet
(YIG) at room temperature. It is similar to a Homogeneous Precessing State
(HPD), observed earlier in antiferromagnetic superfluid $^3$He-B. The formation
of this state explains by the repulsive interaction between magnons, which is
required as ... | 1911.03708v1 |
2019-11-26 | Ultrastrong coupling between a microwave resonator and antiferromagnetic resonances of rare earth ion spins | Quantum magnonics is a new and active research field, leveraging the strong
collective coupling between microwaves and magnetically ordered spin systems.
To date work in quantum magnonics has focused on transition metals and almost
entirely on ferromagnetic resonances in yttrium iron garnet (YIG).
Antiferromagnetic sys... | 1911.11311v1 |
2019-12-15 | Magnon-photon strong coupling for tunable microwave circulators | We present a generic theoretical framework to describe non-reciprocal
microwave circulation in a multimode cavity magnonic system and assess the
optimal performance of practical circulator devices. We show that high
isolation (> 56 dB), extremely low insertion loss (< 0.05 dB), and flexible
bandwidth control can be pot... | 1912.07128v2 |
2020-01-15 | Yttrium Iron Garnet Thickness Influence on the Spin Pumping in the Bulk Acoustic Wave Resonator | The features of phonon-magnon interconversion in acoustic resonator determine
the efficiency of spin pumping from YIG into Pt that may be detected
electrically through the inverse spin Hall effect (ISHE). Based on the methods
developed in previous works for calculating resonator structures with a
piezoelectric (ZnO) an... | 2001.05385v1 |
2020-02-11 | Sub-micrometer near-field focusing of spin waves in ultrathin YIG films | We experimentally demonstrate tight focusing of a spin wave beam excited in
extended nanometer-thick films of Yttrium Iron Garnet by a simple microscopic
antenna functioning as a single-slit near-field lens. We show that the focal
distance and the minimum transverse width of the focal spot can be controlled
in a broad ... | 2002.04284v1 |
2020-02-22 | Bose-Einstein Condensation of Nonequilibrium Magnons in Confined Systems | We study the formation of a room temperature magnon Bose-Einstein condensate
(BEC) in nanoscopic systems and demonstrate that its lifetime is influenced by
the spatial confinement. We predict how dipolar interactions and nonlinear
magnon scattering assist in the generation of a metastable magnon BEC in
energy-quantized... | 2002.09777v2 |
2020-03-12 | Tunable multiwindow magnomechanically induced transparency, Fano resonances, and slow-to-fast light conversion | We investigate the absorption and transmission properties of a weak probe
field under the influence of a strong control field in a hybrid cavity
magnomechanical system in the microwave regime. This hybrid system consists of
two ferromagnetic material yttrium iron garnet (YIG) spheres strongly coupled
to a single cavity... | 2003.13760v4 |
2020-04-11 | Brillouin Light Scattering of Spin Waves Inaccessible with Free-Space Light | Micro-focus Brillouin light scattering is a powerful technique for the
spectroscopic and spatial characterization of elementary excitations in
materials. However, the small momentum of light limits the accessible
excitations to the center of the Brillouin zone. Here, we utilize a metallic
nanoantenna fabricated on the ... | 2004.05314v1 |
2020-04-25 | Pulse-assisted magnetization switching in magnetic nanowires at picosecond and nanosecond timescales with low energy | Detailed understanding of spin dynamics in magnetic nanomaterials is
necessary for developing ultrafast, low-energy and high-density spintronic
logic and memory. Here, we develop micromagnetic models and analytical
solutions to elucidate the effect of increasing damping and uniaxial anisotropy
on magnetic field pulse-a... | 2004.12243v1 |
2020-05-10 | Stationary entanglement between light and microwave via ferromagnetic magnons | We show how to generate stationary entanglement between light and microwave
in a hybrid opto-electro-magnonical system which mainly consists of a microwave
cavity, a yttrium iron garnet (YIG) sphere and a nanofiber. The optical modes
in nanofiber can evanescently coupled to whispering gallery modes, that are
able to in... | 2005.04581v3 |
2020-05-20 | Frequency mixing in a ferrimagnetic sphere resonator | Frequency mixing in ferrimagnetic resonators based on yttrium and calcium
vanadium iron garnets (YIG and CVBIG) is employed for studying their nonlinear
interactions. The ferrimagnetic Kittel mode is driven by applying a pump tone
at a frequency close to resonance. We explore two nonlinear frequency mixing
configuratio... | 2005.09864v1 |
2020-06-05 | Controlling the nonlinear relaxation of quantized propagating magnons in nanodevices | Relaxation of linear magnetization dynamics is well described by the viscous
Gilbert damping processes. However, for strong excitations, nonlinear damping
processes such as the decay via magnon-magnon interactions emerge and trigger
additional relaxation channels. Here, we use space- and time-resolved
microfocused Bril... | 2006.03400v2 |
2020-06-11 | Nonlocal magnon entanglement generation in coupled hybrid cavity systems | We investigate dynamical generation of macroscopic nonlocal entanglements
between two remote massive magnon-superconducting-circuit hybrid systems. Two
fiber-coupled microwave cavities are employed to serve as an interaction
channel connecting two sets of macroscopic hybrid units each containing a
magnon (hosted by a Y... | 2006.06132v3 |
2020-06-25 | Magnon-exciton proximity coupling at a van der Waals heterointerface | Spin and photonic systems are at the heart of modern information devices and
emerging quantum technologies. An interplay between electron-hole pairs
(excitons) in semiconductors and collective spin excitations (magnons) in
magnetic crystals would bridge these heterogeneous systems, leveraging their
individual assets in... | 2006.14257v2 |
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