A5024769147- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Strong Light-Matter Interactions
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Neural Networks and Reservoir Computing
- Multiferroics and related materials
- Photonic and Optical Devices
- Characterization and Applications of Magnetic Nanoparticles
- Metallic Glasses and Amorphous Alloys
- Atomic and Subatomic Physics Research
- Surface Roughness and Optical Measurements
- Quantum, superfluid, helium dynamics
- Advanced Memory and Neural Computing
- Photonic Crystals and Applications
- Magnetic Field Sensors Techniques
- Terahertz technology and applications
- Magnetic and transport properties of perovskites and related materials
- Nonlinear Dynamics and Pattern Formation
- Photorefractive and Nonlinear Optics
- Theoretical and Computational Physics
University of Kaiserslautern
2015-2024
Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
2023-2024
University of Koblenz and Landau
2023
Taras Shevchenko National University of Kyiv
2003-2010
Colorado State University
2006-2007
We experimentally show that exchange magnons can be detected using a combination of spin pumping and inverse spin-Hall effect (iSHE) proving its wavelength integrating capability down to the sub-micrometer scale. The were injected in ferrimagnetic yttrium iron garnet film by parametric iSHE-induced voltage was an attached Pt layer. role density, wavelength, spatial localization for efficiency is revealed. This study opens field magnon-based information processing with nano-scale wavelengths.
We present spatially resolved measurements of the magnon temperature in a magnetic insulator subject to thermal gradient. Our data reveal an unexpectedly close correspondence between spatial dependencies exchange and phonon temperatures. These results indicate that if--as is currently thought--the transverse spin Seebeck effect caused by difference baths, it must be case spectrally nonuniform driven sparsely populated dipolar region spectrum.
An electric current controlled spin-wave logic gate based on a width-modulated dynamic magnonic crystal is realized. The device utilizes waveguide fabricated from single-crystal Yttrium Iron Garnet film and two conducting wires attached to the surface. Application of currents provides means for control effective geometry results in suppression band gap. performance as an AND demonstrated.
Nowadays, the interaction between phonon and magnon subsystems of a magnetic medium is hot topic research. The complexity spectra, existence both bulk surface modes, quantization effects, dependence properties on applied field, make this field very complex intriguing. Moreover, recent advances in fields spin-caloritronics spintronics as well observation spin Seebeck effect (SSE) insulators points crucial role magnons spin-caloric transport processes. In review, we collect variety different...
The phenomenon of coherent wave trapping and restoration is demonstrated experimentally in a magnonic crystal. Unlike the conventional scheme used photonics, occurs not due to deceleration incident when it enters periodic structure but excitation quasinormal modes artificial This at group velocity minima decelerated narrow frequency regions near edges band gaps traveling implemented by means phase-sensitive parametric amplification stored mode.
An ensemble of magnons, quanta spin waves, can be prepared as a Bose gas weakly interacting quasiparticles. Furthermore, the thermalization overpopulated magnon through magnon-magnon scattering processes, which conserve number particles, lead to formation Bose-Einstein condensate at bottom spin-wave spectrum. However, magnon-phonon significantly modify this scenario and new quasiparticles are formed---magnetoelastic bosons. Our observations parametrically populated in single-crystal film...
We present temporal evolution of the spin Seebeck effect in a YIG|Pt bilayer system. Our findings reveal that this is sub-microseconds fast phenomenon governed by temperature gradient and thermal magnons diffusion magnetic materials. A comparison experimental results with thermal-driven magnon-diffusion model shows behavior depends on time development vicinity interface. The effective thermal-magnon length for systems estimated to be around 700nm.
Expanding upon the burgeoning discipline of magnonics, this research elucidates intricate dynamics spin waves (SWs) within three-dimensional nanoenvironments. It marks a shift from traditionally used planar systems to exploration magnetization configurations and resulting 3D nanostructures. This study deploys micromagnetic simulations alongside ferromagnetic resonance measurements scrutinize magnetic gyroids, periodic chiral composed triple junctions with period in nanoscale. Our findings...
The spectral distribution of parametrically excited dipole-exchange magnons in an in-plane magnetized epitaxial film yttrium-iron garnet was studied by means frequency- and wavevector-resolved Brillouin light scattering spectroscopy. experiment performed a parallel pumping geometry where exciting microwave magnetic field to the magnetizing field. It found that for both dipolar exchange areas excites lowest volume magnon modes propagating plane perpendicularly magnetization direction. In...
Abstract Advances in quantum computing and telecommunications stimulate the search for classical systems allowing partial implementation of a similar functionality under less stringent environmental conditions. Here, we present version several bit (qubit) functionalities using two-component magnon Bose–Einstein condensate (BEC) formed at opposite wavevectors room-temperature yttrium-iron-garnet ferrimagnetic film. Employing micromagnetic numerical simulations, show use wavelength-selective...
Brillouin light scattering spectroscopy is a powerful technique for the study of fast magnetization dynamics with both frequency and wavevector resolutions. Here, we report on distinct improvement this spectroscopic toward two-dimensional wide-range selectivity in backward geometry. Spin-wave wavevectors oriented perpendicularly to bias magnetic field are investigated by tilting sample within magnet gap. Wavevectors which parallel applied analyzed turning entire setup, including system. The...
It is demonstrated that the temporal evolution of a spin-wave induced inverse spin Hall effect voltage in magnetic insulator–nonmagnetic metal structure distinctly different from directly excited (microwave pulse driven) mode which it originates. The differences behavior provide compelling evidence incoherent secondary modes, having range characteristic lifetimes, make an important contribution to pumping at insulator-metal interface.
We experimentally demonstrate the manipulation of magnetization relaxation utilizing a temperature difference across thickness an yttrium iron garnet/platinum hetero-structure: damping is either increased or decreased depending on sign gradient. This effect might be explained by thermally induced spin torque precession. The heat-induced variation detected microwave techniques as well DC voltage caused pumping into adjacent Pt layer and subsequent conversion charge current inverse Hall effect.
We carried out a concerted effort to determine the absolute sign of inverse spin Hall effect voltage generated by currents injected into normal metal. focus on yttrium iron garnet (YIG)∣platinum bilayers at room temperature, generating microwaves and temperature gradients. find consistent results for different samples measurement setups that agree with theory. suggest right-hand-rule define positive angle corresponding expected simple case scattering free electrons from repulsive Coulomb charges.
Low-energy consumption enabled by charge-free information transport, which is free from Joule heating, and the ability to process phase-encoded data through use of nanometer-sized interference devices operating at GHz THz frequencies are just a few benefits spin-wave-based technologies. Moreover, when approaching cryogenic temperatures, quantum phenomena in spin-wave systems pave path towards processing. In view these applications, lifetime magnons---spin-wave quanta---is high relevance for...
Evolution of an overpopulated gas magnons to a Bose-Einstein condensate and excitation magnon supercurrent, propelled by phase gradient in the wave function, can be observed at room temperature means Brillouin light scattering spectroscopy yttrium iron garnet material. We study these phenomena wide range external magnetic fields order understand their properties when externally pumped are transferred towards condensed state via two distinct channels: multistage Kolmogorov-Zakharov cascade...
The damping of spin waves parametrically excited in the magnetic insulator Yttrium Iron Garnet (YIG) is controlled by a dc current passed through an adjacent normal-metal film. experiment performed on macroscopically sized YIG(100 nm)/Pt(10 nm) bilayer 4 × 2 mm2 lateral dimensions. spin-wave relaxation frequency determined via threshold parametric instability measured Brillouin light scattering spectroscopy. application to Pt film leads formation spin-polarized electron normal plane due Hall...
Resonant enhancement of spin Seebeck effect (SSE) due to phonons was recently discovered in Y[Formula: see text]Fe[Formula: text]O[Formula: text] (YIG). This is explained by hybridization between the magnon and phonon dispersions. However, this observed at low temperatures high magnetic fields, limiting scope for applications. Here we report observation phonon-resonant SSE room temperature field. We observe Lu[Formula: text]BiFe[Formula: text]GaO[Formula: an 700% greater than that a YIG film...