A5086481721- Magnetic properties of thin films
- Metallic Glasses and Amorphous Alloys
- Magnetic Properties and Applications
- Magneto-Optical Properties and Applications
- Theoretical and Computational Physics
- Characterization and Applications of Magnetic Nanoparticles
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Photonic Crystals and Applications
- Pancreatic and Hepatic Oncology Research
- Advanced Memory and Neural Computing
- Advanced Data Storage Technologies
- Adhesion, Friction, and Surface Interactions
- HER2/EGFR in Cancer Research
- Superconducting Materials and Applications
- Anodic Oxide Films and Nanostructures
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Gas Sensing Nanomaterials and Sensors
- PI3K/AKT/mTOR signaling in cancer
- Pleural and Pulmonary Diseases
- Cellular Automata and Applications
- Boron and Carbon Nanomaterials Research
- Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
- Pneumothorax, Barotrauma, Emphysema
Fachhochschule Kiel
2019-2023
University of Pavol Jozef Šafárik
2010-2023
Institute of Physics of the Slovak Academy of Sciences
2008-2021
Kiel University
1999-2021
Johannes Gutenberg University Mainz
2015-2017
Laboratoire de physique des Solides
2013-2017
Université Paris-Sud
2014-2017
Centre National de la Recherche Scientifique
2017
Instituto de Ciencia de Materiales de Madrid
2010
Integrated magneto-optical components require magnetic thin films for tuning of their parameters, and many applications yttrium iron garnet (YIG) is the material choice. The authors study high-quality cerium-substituted YIG grown by pulsed laser deposition, which possess tunable anisotropy a greatly enhanced magneto-optic Kerr effect, compared to conventional films. This discovery presents new opportunities engineering tomorrow's spintronic logic devices.
The dynamics of emergent magnetic quasiparticles, such as vortices, domain walls, and bubbles are studied by scanning transmission x-ray microscopy (STXM), combining (XMCD) contrast with about 25 nm lateral resolution well 70 ps time resolution. Essential progress in the understanding vortex is achieved core reversal observed sub-GHz excitation gyromode, either ac fields or spin transfer torque. basic switching scheme for this generation a vortex-antivortex pair. Much faster obtained...
We have studied the domain wall longitudinal propagation and its dynamics under influence of transverse magnetic field in thin wires. A different behavior was observed for strong weak fields. In Ht, depends on direction Ht. Transverse applied one increases Walker limit shifts existence to higher axial field. opposite decreases favors vortex even at low Different obtained which speeds up velocity saturation value 9 km/s independently orientation
We present the domain wall dynamics in amorphous glass-coated microwires. It is described by linear dependence of velocity on applied magnetic field. For higher Ni content microwires, consists two regions: at low field, has mobility and a negative critical propagation At fields, increases as result structure change. The this range positive field high mobility, which allows to reach very more than 10\thinspace 000 m/s. Such fast exceeds sound interaction with phonons observed when approaches limit.
A ring-shaped magnetic logic device offers two vortex states (clockwise and counterclockwise) to encode bits, with relative stability against external fields. The dynamics of magnetization switching in such structures, though, still need unraveling. authors present direct experimental visualization reproducible, robust rings via domain-wall automotion, which does not require an applied field. Simulations reveal that annihilation domain walls through automotion always occurs, the detailed...
We report time-resolved observations of field-induced domain wall nucleation in asymmetric ferromagnetic rings using single direction field pulses and rotating fields. show that the geometry a ring allows for controlling position events, when is nucleated by magnetic field. Direct observation scanning transmission x-ray microscopy (STXM) reveals walls occurs through creation transient ripplelike structures. This magnetization state found to exhibit surprisingly high reproducibility even at...
Abstract In the present work we give an overview on domain‐wall dynamics in amorphous glass‐coated microwires with positive magnetostriction. They are characterized by a peculiar domain structure that allows us to study magnetization process of single wall. The is at least 4 regimes. At low field, interaction wall defects observed characteristic for adiabatic regime. medium moves viscous regime, where velocity proportional applied magnetic‐field amplitude. higher fields, mobility steeply...
We deal with the influence of applied stress on domain wall velocity in glass-coated magnetic microwires. In general, decreases tensile stress. Four regimes dynamics appear: (1) diffusion-damped, (2) a regime variable width, (3) viscous and (4) vortex regime. Detailed analysis parameters shows that structural relaxation plays an important role even at ambient temperatures if high is present. At higher fields (viscous regime), most damping arises from moments. Finally, steeply increases...
Amorphous glass-coated microwires are well known by high domain wall velocities that reach up to 15 km/s. Previous works have shown such fast dynamics can be manipulated properly selected conditions of thermal annealing. Along with the magnetic anisotropy, velocity is strongly influenced surface shell domains too. Here, magneto-optical study reversal process in microwire carried out Kerr effect (MOKE) microscopy. It nonplanar cylindrical samples gives rise a complex MOKE. Trapping potential,...
Ferromagnetic La0.7Sr0.3Mn1-xRuxO3 epitaxial multilayers with controlled variation of the Ru/Mn content were synthesized to engineer canted magnetic anisotropy and variable exchange interactions, explore possibility generating a Dzyaloshinskii-Moriya interaction. The ultimate aim multilayer design is provide conditions for formation domains nontrivial topology in an oxide thin film system. Employing force microscopy Lorentz transmission electron varying perpendicular fields, stripe separated...
One vein of spintronics research seeks to harness propagating magnetic domain walls for information processing. The authors engineer a potential landscape via local variations in ring geometry, and image the motion rotating fields quantify contribution spatially varying wall dynamics. Domain-wall velocity depends on width, being highest where is widest, such thus could be selected synchronize velocities enable applications.
The nonplanar sample surface is a crucial feature that must be taken into account for good interpretation of magneto-optical observations magnetic cylindrical microwires. This due to the fact curved topography gives rise spatial distribution local planes incidence as function position on circumference cylinder. Analytical calculations contrast cylinders spontaneously magnetized in axial direction reveal an magnetization reversal produces characteristic black-and-white and it does not...
Amorphous glass-coated microwires are magnetic materials well-known by very high domain wall velocities reaching up to 15 km/s. In the previous works was shown, that dynamics in could be effectively tuned biasing of additional anisotropies. Here we show possibility inducing anisotropy microwires. Thermal annealing at 300 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$^{\circ}{\rm C}$</tex></formula>...
Abstract In the present contribution, we deal with two anomalous effects that have been found in magnetic microwires during domain‐wall dynamics study. First, there is a negative critical propagation field H 0 . Its frequency and temperature dependence dealt terms of potential minima separated by energy barrier. Secondly, it mobility S appears as result stabilization domain structure through structural relaxation. The can be tuned from to positive values properly setting measuring condition...
Magnetic properties of highly magnetostrictive amorphous glass-coated microwires are strongly correlated to the presence a glass coating that introduces spatially inhomogeneous stress field distribution. We investigate influence mechanical stresses on inclination magnetic domain walls in microwires. Magneto-optical Kerr effect imaging is used compare tilted orientation wall shape as-cast and annealed Angular dependencies magnetization loops measured by alternating gradient magnetometry...
We have studied the domain wall dynamics in thin amorphous glass-coating microwires under influence of both axial and transversal magnetic fields. Two different regions been found according to amplitude applied field rotated out wire's axis. At low amplitude, effect rotation is reduced reduction its component velocity decreases. For high amplitudes field, maximum was when forms angle -20° with The results are explained terms structure, being for vortex
The paper deals with the influence of an external perpendicular magnetic field on a domain wall motion in glass-coated amorphous microwires.The dependence velocity axial is measured at presence field.Subsequently, microwire rotated field.The results show that rotation increases certain rotations.At same time, it shows mobility varies periodically microwire.The are discussed terms anisotropy.