A5103072190- Magnetic properties of thin films
- Multiferroics and related materials
- Magnetic Properties and Applications
- Quantum and electron transport phenomena
- Magneto-Optical Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Acoustic Wave Resonator Technologies
- Photonic Crystals and Applications
- Advanced Condensed Matter Physics
- Topological Materials and Phenomena
- Theoretical and Computational Physics
- Characterization and Applications of Magnetic Nanoparticles
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Magnetic Properties and Synthesis of Ferrites
- Heusler alloys: electronic and magnetic properties
- Graphene research and applications
- Advanced X-ray Imaging Techniques
- Neural Networks and Reservoir Computing
- Advanced Chemical Physics Studies
- Cryospheric studies and observations
- Fluid Dynamics and Thin Films
- Pigment Synthesis and Properties
- Liquid Crystal Research Advancements
University of Basel
2020-2025
German Red Cross
2025
Krankenhaus vom Roten Kreuz
2025
University of Duisburg-Essen
2012-2021
Helmholtz-Zentrum Dresden-Rossendorf
2014-2021
Fraunhofer Institute for Material and Beam Technology
2020
Technische Universität Dresden
2016-2019
Max Planck Institute for Chemical Physics of Solids
2010-2016
Max Planck Society
2010
Karlsruhe Institute of Technology
2010
Antiferromagnetic insulators are a prospective materials platform for magnonics, spin superfluidity, THz spintronics, and non-volatile data storage. A magnetomechanical coupling in antiferromagnets offers vast advantages the control manipulation of primary order parameter yet remains largely unexplored. Here, we discover new member family flexoeffects thin films Cr2O3. We demonstrate that gradient mechanical strain can impact magnetic phase transition resulting distribution Néel temperature...
Abstract Considering the growing interest in magnetic materials for unconventional computing, data storage, and sensor applications, there is active research not only on material synthesis but also characterisation of their properties. In addition to structural integral characterisations, imaging magnetisation patterns, current distributions fields at nano- microscale major importance understand responses qualify them specific applications. this roadmap, we aim cover a broad portfolio...
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...
Focused-electron-beam-induced deposition is a promising technique for patterning nanomagnets in single step. We fabricate cobalt such process and characterize their content, saturation magnetization, stray magnetic field profiles by using combination of transmission electron microscopy scanning nitrogen-vacancy (NV) magnetometry. find agreement between the measured magnetization with micromagnetic simulations. further domains grainy fields halo side-deposits. This work may aid evaluation Co...
A joint theoretical–experimental study focusing on the description of ferromagnetic resonance response thin films in presence periodic perturbations introduced upper film surface is presented. From viewpoint theory, these may exist form any kind one- or two-dimensional rectangular defect arrays patterned onto one magnetic film. Indeed, defects be pits bumps, ion-implanted regions with a lower saturation magnetization. The complete set functions, given by components frequency and wave-vector...
Abstract Thin films of the magnetoelectric insulator α ‐Cr 2 O 3 are technologically relevant for energy‐efficient magnetic memory devices controlled by electric fields. In contrast to single crystals, quality thin Cr is usually compromised presence point defects and their agglomerations at grain boundaries, putting into question application potential. Here, impact defect nanostructure, including sparse small‐volume complexes studied on properties films. By tuning deposition temperature,...
We demonstrate how planar microresonators (PMRs) can be utilized to investigate the angular dependent magnetic resonance response of single nanostructures. In contrast alternative detection schemes like electrical or optical detection, PMR approach provides a classical means investigating high frequency dynamics entities, enabling use well-established analysis methods ferromagnetic (FMR) spectroscopy. To performance PMR-based FMR setup for measurements, we microwave excited magnons in Co...
We present an experimental study of time refraction spin waves propagating in microscopic waveguides under the influence time-varying magnetic fields. Using space- and time-resolved Brillouin light scattering microscopy, we demonstrate that broken translational symmetry along coordinate can be used to in- or decrease energy during their propagation. This allows for a broadband controllable shift spin-wave frequency. integrated design waveguide current line generation strong, nanosecond-long,...
Magnons can transfer information in metals and insulators without Joule heating, therefore are promising for low-power computation. The on-chip magnonics however suffers from high losses due to limited magnon decay length. In metallic thin films, it is typically on the tens of micrometre length scale. Here, we demonstrate an ultra-long up one millimetre multiferroic/ferromagnetic BiFeO3(BFO)/La0.67Sr0.33MnO3(LSMO) heterostructures at room temperature. This attributed a magnon-phonon...
Abstract Background A significant proportion of false positive recalls mammography‐screened women is due to benign breast cysts and simple fibroadenomas. These lesions appear mammographically as smooth‐shaped dense masses require the recalling for a ultrasound obtain complementary imaging information. They can be identified safely by with no need further assessment or treatment. Purpose Grating‐based x‐ray dark‐field allows contrast formation based on both attenuation small‐angle scattering...
The magnetization dynamics of individual Fe-filled multiwall carbon-nanotubes (FeCNT), grown by chemical vapor deposition, are investigated microresonator ferromagnetic resonance (FMR) and Brillouin light scattering (BLS) microscopy corroborated micromagnetic simulations. Currently, only static magnetometry measurements available. They suggest that the FeCNTs consist a single-crystalline Fe nanowire throughout length. number structure FMR lines abrupt decay spin-wave transport seen in BLS...
Metastable face-centered-cubic $\mathrm{F}{\mathrm{e}}_{78}\mathrm{N}{\mathrm{i}}_{22}$ thin films are excellent candidates for focused ion beam direct writing of magnonic structures due to their favorable magnetic properties after ion-beam-induced transformation. The transforms the originally nonmagnetic fcc phase into ferromagnetic bcc with additional control over direction uniaxial in-plane anisotropy and saturation magnetization. Local eliminates need external fields, paving way towards...
Abstract In order to separate small magnetizable particles down the micro‐ and nanometer scale, high‐gradient magnetic separation is a well‐established process. The superposition of filtration with centrifugation, called field‐enhanced permits continuous separation. efficiency filters prediction described. one single stage could be enhanced from 51 78 % by increasing wire number improving cross section. on different particle sizes at filter numbers comparison based forces fluid drag force...
Abstract Spin Hall oscillators (SHO) are promising candidates for the generation, detection and amplification of high frequency signals, that tunable through a wide range operating frequencies. They offer to be read out electrically, magnetically optically in combination with simple bilayer design. Here, we experimentally study spatial dependence spectral properties auto-oscillations SHO devices based on Pt(7 nm)/Ni 80 Fe 20 (5 nm) tapered nanowires. Using Brillouin light scattering...
In this letter, we present a numerical approach to obtain the ferromagnetic resonance spectra of micrometer- and nanometer-sized magnetic elements by micromagnetic simulations. By mimicking common experimental conditions, applied static field used linearly polarized oscillating excite magnetization dynamics. A continuous single-frequency excitation is utilized, which permits study steady-state dynamics in space time domain. This gives direct access fields, linewidths, relative amplitudes as...
We determined the magnetic anisotropy energy and g-factor of an uncapped 10 nm thick Fe/GaAs(110) film using a setup that allows frequency (1.5–26.5 GHz) as well angular dependent ferromagnetic resonance measurements under ultrahigh vacuum conditions. The g=2.61±0.1 is unusually high at room temperature can be interpreted result increased orbital moment due to strain. This interpretation supported by more surface sensitive x-ray circular dichroism which yield g=2.21±0.02 measured remanence....
An all-electrical method is presented to determine the exchange constant of magnetic thin films using ferromagnetic resonance. For 20 nm thickness and below, determination A, a fundamental quantity, anything but straightforward. Among others, most common methods are based on characterization perpendicular standing spin-waves. These approaches however challenging, due (i) very high energies (ii) rather small intensities in this regime. In approach, surface patterning applied permalloy...
The reciprocity of spin-wave propagation in 180° Néel walls and surrounding domains is studied. For this, the dispersion relation, phase fronts, intensities are analyzed via micromagnetic simulations. Despite in-plane curling magnetization, domain wall itself acts as a reciprocal channel, whereas nonreciprocal found within domains. Because localization depends on selected frequency, this may allow control degree asymmetry.
Magnetism of oxide antiferromagnets (AFMs) has been studied in single crystals and extended thin films. The properties AFM nanostructures still remain underexplored. Here, we report on the fabrication magnetic imaging granular 100 nm-thick magnetoelectric Cr
Antiferromagnetic (AFM) spin-orbitronics and data storage rely on the motion of AFM solitons (domain walls skyrmions) in thin films consisting nanocrystalline grains. The design high-performance antiferromagnet-based memory logic devices has been limited by a lack knowledge about interaction with grain boundaries. authors develop model material (e.g. magnetoelectric Cr${}_{2}$O${}_{3}$), including proper intergrain exchange. Their approach provides rules for granular devices, should...
We present a numerical approach to simulate the Ferromagnetic Resonance (FMR) of micron and nanosized magnetic elements by micromagnetic finite difference method. In addition static field linearly polarized oscillating is utilized excite analyze spin wave excitations observed in space- time-domain. Our continuous (CW) provides an alternative common simulation method, which uses pulsed excitation system. It directly models conventional FMR-experiments permits determination real imaginary part...