A5015646634- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- Theoretical and Computational Physics
- Characterization and Applications of Magnetic Nanoparticles
- Multiferroics and related materials
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Advanced Memory and Neural Computing
- Neural Networks and Reservoir Computing
- Acoustic Wave Resonator Technologies
- Optical Coatings and Gratings
- Ferroelectric and Piezoelectric Materials
- Photonic and Optical Devices
- Magnetic and transport properties of perovskites and related materials
- Surface and Thin Film Phenomena
- Acoustic Wave Phenomena Research
- Advanced Condensed Matter Physics
- Advanced MEMS and NEMS Technologies
- Magnetic Bearings and Levitation Dynamics
- Magnetic Field Sensors Techniques
- Water and Wastewater Treatment
- Economic and Industrial Development
Institute of Magnetism
2016-2025
National Academy of Sciences of Ukraine
2015-2024
Universidade do Porto
2015-2020
Oakland University
2015
National University of Singapore
2015
Taras Shevchenko National University of Kyiv
2012-2013
A spin-wave (SW) directional coupler comprised of two laterally parallel nano-scale dipolarly-coupled SW waveguides is proposed and studied using micromagnetic simulations analytical theory. The energy a excited in one the course propagation periodically transferred to other waveguide back, spatial half-period this transfer defined as coupling length. length determined by dipolar between waveguides, fraction at device output can be varied with frequency, bias magnetic field, relative...
Spin waves are investigated in yttrium iron garnet waveguides with a thickness of 39 nm and widths ranging down to 50 nm, i.e., an aspect ratio over width approaching unity, using Brillouin light scattering spectroscopy. The experimental results verified by semianalytical theory micromagnetic simulations. A critical is found, below which the exchange interaction suppresses dipolar pinning phenomenon. This changes quantization criterion for spin-wave eigenmodes pronounced modification...
The design of modern circulators and isolators relies on nonreciprocal (discriminating forward backward wave vectors, breaking time-reversal symmetry) electromagnetic waves in magnetic materials. Creating such devices that are small enough for portable electronics (think mobile phones) remains challenging. authors show theoretically the propagation surface acoustic multilayers with simultaneous magnetoelastic Dzyaloshinskii-Moriya interactions. Despite both interactions being relatively...
Spin waves are ideal candidates for wave-based computing, but the construction of magnetic circuits is blocked by a lack an efficient mechanism to excite long-running exchange spin with normalized amplitudes. Here, we solve challenge exploiting deeply nonlinear phenomenon forward volume in 200-nm-wide nanoscale waveguides and validate our concept using microfocused Brillouin light scattering spectroscopy. An unprecedented frequency shift more than 2 GHz achieved, corresponding magnetization...
Spin waves and their quanta magnons are the collective excitations of a spin systems magnetic material, which offer potential for higher efficiency lower energy consumption in solving specific issues data processing. This Perspective discusses current challenges realizing magnonic circuits based on building blocks developed to date, further looks at application neuromorphic networks stochastic, reservoir, quantum computing, advantages over conventional electronics these areas.
Magnonics is a rapidly growing field, attracting much attention for its potential applications in data transport and processing. Many individual magnonic devices have been proposed realized laboratories. However, an integrated circuit with several separate elements has yet not reported due to the lack of amplifier compensate processing losses. The magnon transistor Chumak et al. [Nat. Commun. 5, 4700 (2014)] could only achieve gain 1.8, which insufficient many practical cases. Here, we use...
A general theory of collective spin-wave excitations in a two-dimensional array magnetic nanodots coupled by magnetodipolar interaction is developed. The allows one to analytically calculate spectra, damping rates, excitation efficiencies, and other characteristics spin waves both periodic aperiodic ground states an array. It demonstrated that all the properties existing any spatially state (e.g., ferromagnetic or chessboard antiferromagnetic) are determined same state-independent array's...
The storage and transport of spin currents in spintronic devices are typically controlled by inputs electrical current. This work instead proposes applying a voltage to excite propagating wave an ultrathin ferromagnetic heterostructure. so-called ``voltage-controlled magnetic anisotropy'' technology could lead significantly decreased power consumption improved compatibility with conventional semiconductor devices.
We present the generation of whispering gallery magnons with unprecedented high wave vectors via nonlinear 3-magnon scattering in a $\ensuremath{\mu}\mathrm{m}$-sized magnetic ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$ disc which is vortex state. These modes exhibit strong localization at perimeter and practically zero amplitude an extended area around core. They originate from splitting fundamental radial magnon modes, can be resonantly excited texture by out-of-plane microwave field. shed...
One of the major challenges in surface acoustic wave (SAW) technology, which is widely used modern signal processing, absence nonreciprocity (one-way propagation). To tackle this problem, authors propose an approach based on magnetoelastic coupling SAWs to spin waves possessing a suitable spectrum. This allows creation nonreciprocal SAW devices with almost no limitations working-frequency band (in contrast severe traditional approaches), realize full potential magnetoelastically induced...
Performing propagating spin-wave spectroscopy of thin films at millikelvin temperatures is the next step toward realization large-scale integrated magnonic circuits for quantum applications. Here, we demonstrate propagation in a 100 nm-thick yttrium-iron-garnet (YIG) film down to 45 mK, using stripline nanoantennas deposited on YIG surface electrical excitation and detection. The clear transmission characteristics over distance 10 μ m are measured extracted group velocity saturation...
Abstract Quantum magnonics investigates the quantum-mechanical properties of magnons, such as quantum coherence or entanglement for solid-state information technologies at nanoscale. The most promising material is ferrimagnetic yttrium iron garnet (YIG), which hosts magnons with longest lifetimes. YIG films highest quality are grown on a paramagnetic gadolinium gallium (GGG) substrate. literature has reported that ferromagnetic resonance (FMR) frequencies YIG/GGG decrease temperatures below...
The voltage-controlled magnetic anisotropy (VCMA) effect, which manifests itself as variation of a thin layer conductive ferromagnet on dielectric substrate under the influence an external electric voltage, can be used for development novel information storage and signal processing devices with low power consumption. Here it is demonstrated by micromagnetic simulations that application microwave voltage to nanosized VCMA gate in ultrathin ferromagnetic nanowire results parametric excitation...
The existence of backscattering-immune spin-wave modes is demonstrated in magnetic thin films nanoscale thickness. Our results reveal that chiral magnetostatic surface waves (CMSSWs), which propagate perpendicular to the magnetization direction an in-plane magnetized film, are robust against backscattering from defects. CMSSWs protected various types inhomogeneities and defects as long their frequency lies inside gap volume modes. explanation independent topology predicts this robustness a...
Abstract The field of magnonics, which aims at using spin waves as carriers in data-processing devices, has attracted increasing interest recent years. We present and study micromagnetically a nonlinear nanoscale magnonic ring resonator device for enabling implementations logic gates neuromorphic circuits. In the linear regime, this efficiently suppresses spin-wave transmission phenomenon critical resonant coupling, thus exhibiting behavior notch filter. By input power, resonance frequency...
We present a combined numerical, theoretical, and experimental study on stimulated three-magnon splitting in magnetic disk the vortex state. Our micromagnetic simulations Brillouin-light-scattering results confirm that can be triggered even below threshold by exciting one of secondary modes magnons propagating waveguide next to disk. The experiments show stimulation is possible over an extended range excitation powers wide frequencies around eigenfrequencies modes. Rate-equation calculations...
Bistability, a universal phenomenon found in diverse fields such as biology, chemistry, and physics, describes scenario which system has two stable equilibrium states resets to one of the states. The ability switch between these is basis for wide range applications, particularly memory logic operations. Here, we present approach achieve bistable switching magnonics, field processing data using spin waves. A pronounced window observed 1 μm magnonic conduit under an external rf drive....
It is demonstrated that collective spin waves (SWs) propagating in complex periodic arrays of dipolarly coupled magnetic nanopillars existing a saturated (single-domain) ground state zero bias field could be nonreciprocal. To guarantee the SW nonreciprocity, two conditions should fulfilled: (i) existence nonzero out-of-plane component pillars' static magnetization and (ii) periodicity array's with at least elements per primitive cell, if are different, three identical.
Abstract Spin-Hall oscillators (SHO) are promising sources of spin-wave signals for magnonics applications, and can serve as building blocks magnonic logic in ultralow power computation devices. Thin magnetic layers used “free” SHO contact with heavy metals having large spin-orbital interaction, and, therefore, could be subject to the spin-Hall effect (SHE) interfacial Dzyaloshinskii-Moriya interaction ( i -DMI), which may lead nonreciprocity excited spin waves other unusual effects. Here,...
Abstract Spin torque oscillators (STOs) are compact, tunable sources of microwave radiation that serve as a test bed for studies nonlinear magnetization dynamics at the nanometer length scale. The spin in an STO can be created by spin-orbit interaction, but low spectral purity signals generated orbit hinders practical applications these magnetic nanodevices. Here we demonstrate method decreasing phase noise based on Pt/Ni 80 Fe 20 nanowires. We experimentally tapering nanowire, which serves...
Abstract Magnetoelastic coupling is considered as one of the most reliable method to induce nonreciprocity propagation losses microwave‐frequency surface acoustic waves (SAW) and other modes propagating in nonmagnetic‐ferromagnetic heterostructures. Here, it demonstrated theoretically that magnetoelastic can also phase SAW, which necessary for development SAW circulators nonreciprocal solid‐state‐acoustic devices. In contrast previous studies, induction requires a strongly spin wave (SW),...
Nonlinear phenomena are crucial for magnon-based information processing, but the nonlinear interaction between two spin-wave signals requires their spatiotemporal overlap, which can be challenging directional processing devices. Our study focuses on a gallium-substituted yttrium iron garnet film, exhibits an exchange-dominated dispersion relation and, thus, provides particularly broad range of group velocities compared to pure YIG. Using time- and space-resolved Brillouin light scattering...