A5033953131- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Quantum and electron transport phenomena
- Theoretical and Computational Physics
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Characterization and Applications of Magnetic Nanoparticles
- Photonic Crystals and Applications
- Strong Light-Matter Interactions
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Neural Networks and Reservoir Computing
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Nonlinear Photonic Systems
- Quantum, superfluid, helium dynamics
- Nonlinear Dynamics and Pattern Formation
- Magnetic Field Sensors Techniques
- Advanced Memory and Neural Computing
- Multiferroics and related materials
- Surface and Thin Film Phenomena
- Magnetic and transport properties of perovskites and related materials
- ZnO doping and properties
- Metallic Glasses and Amorphous Alloys
University of Münster
2014-2024
CeNTech
2016-2023
M.N. Mikheev Institute of Metal Physics
2014-2022
Centre National de la Recherche Scientifique
2017-2020
Institut polytechnique de Grenoble
2020
CEA Grenoble
2020
Spintronique et Technologie des Composants
2020
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2020
Université Grenoble Alpes
2020
Emory University
2015-2019
Magnonics is a young field of research and technology emerging at the interfaces between study spin dynamics, on one hand, number other fields nanoscale science technology, other. We review foundations recent achievements in magnonics view guiding further progress from studying fundamental magnonic phenomena towards applications. discuss major challenges that have to be addressed future order make pervasive technology.
The recently discovered oscillating exchange effect in iron–chromium multilayers can best be studied on an epitaxial iron sandwich with a wedge shaped chromium interlayer. Domain patterns are analyzed as well magnetization curves such samples using magnetooptical techniques. Unusual domains found zones around the transitions between ferromagnetic and antiferromagnetic exchange. Also for larger thickness show some peculiar features. interpretation of these invokes coupling layers which...
We show experimentally and by model calculations that in finite, nonellipsoidal, micrometer size magnetic thin film elements the dynamic eigenexcitations (spin waves) may exhibit strong spatial localization. This localization is due to formation of a potential well for spin waves highly inhomogeneous internal field within element.
Abstract In recent years, spin–orbit effects have been widely used to produce and detect spin currents in spintronic devices. The peculiar symmetry of the Hall effect allows creation a accumulation at interface between metal with strong interaction magnetic insulator, which can lead net pure current flowing from into insulator. This applies torque on magnetization, eventually be driven steady motion. Tailoring this experiment extended films has proven elusive, probably due mode competition....
We experimentally demonstrate magnetic nano-oscillators driven by pure spin current produced the Hall effect in a bow tie-shaped nanoconstriction. These devices exhibit single-mode auto-oscillation and generate highly-coherent electronic microwave signals with significant power spectral linewidth as low 6.2 MHz at room temperature. The proposed simple flexible device geometry is amenable to straightforward implementation of advanced spintronic structures such chains mutually coupled...
Abstract Magnonic nano-devices exploit magnons - quanta of spin waves to transmit and process information within a single integrated platform that has the potential outperform traditional semiconductor-based electronics. The main missing cornerstone this nanotechnology is an efficient scheme for amplification propagating waves. recent discovery spin-orbit torque provided elegant mechanism propagation losses compensation. While partial compensation spin-wave been achieved, true – exponential...
We show that dynamic magnetization at the lateral edges of a thin, axially magnetized magnetic element with finite in-plane size can be described by effective ``pinning'' boundary conditions. This pinning is purely dipolar nature, not related to magnetocrystalline surface anisotropy material, and determined inhomogeneity demagnetizing field near element. Eigenfunctions eigenvalues obtained using these conditions give quantitative description quantized spin wave spectra experimentally...
We report on the observation of quantized surface spin waves in periodic arrays magnetic ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$ wires by means Brillouin light scattering spectroscopy. At small transferred wave vectors $({q}_{\ensuremath{\Vert}}\ensuremath{\cong}0--1.0\ifmmode\times\else\texttimes\fi{}{10}^{5}{\mathrm{cm}}^{\ensuremath{-}1})$ several discrete, dispersionless modes with a frequency splitting up to 0.9 GHz were observed for vector oriented perpendicular wires. From frequencies...
We have studied experimentally the excitation of propagating spin-wave modes a microscopic Permalloy-film waveguide by stripe antenna. show that due to strong quantization spectrum, particular has essentially different frequency dependencies leading nonmonotonous variation modulation depth resulting beam as function frequency. In addition, we address effect nonreciprocity and found for case Permalloy microwaveguides this is much weaker pronounced than waveguides made from dielectric magnetic...
The study of collective spin excitations in magnetically ordered materials (so-called waves and the associated quasi-particles—magnons) has a successful history more than 60 years. Recently, it re-emerged new aspect under name magnonics, although exact definition its scope is still subject for debate. However, widely accepted that recent renaissance interest been driven by three major factors: rapid advance nanotechnology, development experimental techniques studying high-frequency...
We use microfocus Brillouin light scattering spectroscopy to study the interaction of spin current with magnetic fluctuations in a Permalloy microdisk located on top Pt strip carrying an electric current. show that can be efficiently suppressed or enhanced by different directions Additionally, we find effect is strongly influenced nonlinear magnon-magnon interactions. The observed phenomena used for controllable reduction thermal noise spintronic nanodevices.
We describe a new technique, micro-Brillouin light scattering spectroscopy, for investigation of spin wave dynamics in magnetic nanostructures. The technique offers advantages studies small squares with closure domain structure and nanoelements similar to those used random access memory. is particularly effective two-dimensional mapping waves excited by single nanocontact due the torque transfer effect.
It is demonstrated that the threshold current for damping compensation can be reached in a 5 μm diameter YIG(20 nm)|Pt(7 nm) disk. The demonstration rests upon measurement of ferromagnetic resonance linewidth as function I(dc) using magnetic force microscope (MRFM). shown losses spin-wave modes existing insulator reduced or enhanced by at least factor depending on polarity and intensity an in-plane dc flowing through adjacent normal metal with strong spin-orbit interaction. Complete...