A5078359024- Magnetic properties of thin films
- Magnetic Properties and Applications
- Metallic Glasses and Amorphous Alloys
- Physics of Superconductivity and Magnetism
- Soil and Unsaturated Flow
- Theoretical and Computational Physics
- Radioactive element chemistry and processing
- Clay minerals and soil interactions
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Sports Dynamics and Biomechanics
- Advanced Electron Microscopy Techniques and Applications
- Semiconductor materials and devices
- Music Technology and Sound Studies
- NMR spectroscopy and applications
- Experimental and Theoretical Physics Studies
- Magnetic Properties of Alloys
- Groundwater flow and contamination studies
Universität Hamburg
2015-2018
Institut des Sciences de la Terre
2014-2015
Université Gustave Eiffel
2015
Centre National de la Recherche Scientifique
2015
Institut Laue-Langevin
2014-2015
Université Grenoble Alpes
2015
Université Joseph Fourier
2014
University of L'Aquila
2011-2013
We demonstrate the feasibility of investigating periodically driven magnetization dynamics in a scanning electron microscope with polarization analysis based on spin-polarized low-energy diffraction. With present setup, analyzing time structure scattering events, we obtain temporal resolution 700 ps, which is demonstrated by means imaging field-driven 100 MHz gyration vortex soft-magnetic FeCoSiB square. Owing to efficient intrinsic timing scheme, high-quality movies, giving two components...
Using time-resolved scanning electron microscopy with polarization analysis (TR-SEMPA) the dynamics of magnetic vortices and antivortices in a cross-tie wall is investigated. Under quasistatic external field drive both quasiparticles oscillate at opposite phase to each other (in analogy an optical mode). An additional common motion, which stems from finite boundary conditions patterned FeCoSiB rectangle, observed acoustic mode), leading total stronger field-dependent displacement for...
Magnetization hysteresis loops are measured on FeMn/FeCo bilayers. The existence of the exchange bias effect up to room temperature is guaranteed by presence copper as a seed layer. We demonstrate that choice growth parameters for Cu allows control magnetic response structure, tuning coercivity and field. switching field distribution suggests different magnetization reversal mechanisms during ascending descending branches loop. evident noisy character data, with respect initially set...
We investigate the dynamics of a one-dimensional oscillator made mass connected to circular spring under uniaxial extension. The functional dependence elastic energy on strain is obtained by solving differential equations resulting from variational formalism common Euler’s elastica problem. calculated nonlinear force agrees with experiment, confirming anharmonic nature oscillator.
Ferromagnetic (FM) FeCo is investigated in exchange bias systems. The ferromagnetic layer grown on a FeMn antiferromagnetic (AFM) layer. Partial superficial oxidation of observed. standard field cooling procedure results large room temperature effect. However, the training effect observed when hysteresis loops are repeated does not have saturating trend. This behavior related to evolution pinned moments at FM/AFM interface. X-ray circular magnetic dichroism technique used clarify this mechanism.
With respect to exchange bias systems it is mainly agreed on that pinned and unpinned uncompensated moments at the interface play an important role [1,2], while full picture of all underlying microscopic mechanisms yet has be developed. The amount nature depend among others quality. This influences coercivity enhancement, maximum field, accordingly required field cooling procedure. Therefore, purpose this work elucidate subject in a well known EB system, namely FeMn/FeCo system [3]....