Topological mass of magnetic Skyrmions probed by ultrafast dynamic imaging
- In this thesis, we investigate the GHz dynamics of skyrmionic spin structures byrnmeans of pump-probe dynamic imaging to determine the equation of motion thatrngoverns the behavior of these technologically relevant spin structures. To achieve this goal, we first designed and optimized a perpendicular magnetic anisotropy CoB/Pt multilayer material for low magnetic pinning, as required for ultrafast pump-probe imaging experiments. Second, we developed an integrated sample design for x-ray holography capable of tracking relative magnetic positional changes down to 3 nm spatial resolution. These advances enabled us to image the trajectory of a single magnetic Skyrmion. We find that the motion is comprised of two gyrotropic modes, one clockwise and one counterclockwise. The existence of two modes shows that Skyrmions are massive quasiparticles. From their derived frequencies we find an inertial mass for the Skyrmion which is a factor of five larger than expected based on existing models forIn this thesis, we investigate the GHz dynamics of skyrmionic spin structures byrnmeans of pump-probe dynamic imaging to determine the equation of motion thatrngoverns the behavior of these technologically relevant spin structures. To achieve this goal, we first designed and optimized a perpendicular magnetic anisotropy CoB/Pt multilayer material for low magnetic pinning, as required for ultrafast pump-probe imaging experiments. Second, we developed an integrated sample design for x-ray holography capable of tracking relative magnetic positional changes down to 3 nm spatial resolution. These advances enabled us to image the trajectory of a single magnetic Skyrmion. We find that the motion is comprised of two gyrotropic modes, one clockwise and one counterclockwise. The existence of two modes shows that Skyrmions are massive quasiparticles. From their derived frequencies we find an inertial mass for the Skyrmion which is a factor of five larger than expected based on existing models for inertia in magnetism. Our results demonstrate that the mass of Skyrmions is based on a novel mechanism emerging from their confined nature, which is a direct consequence of their topology.…
Author: | Felix BüttnerORCiDGND |
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URN: | urn:nbn:de:bvb:384-opus4-989579 |
Frontdoor URL | https://opus.bibliothek.uni-augsburg.de/opus4/98957 |
URL: | https://openscience.ub.uni-mainz.de/handle/20.500.12030/1790 |
Advisor: | Mathias Kläui, Stefan Eisebitt |
Type: | Book |
Language: | English |
Year of first Publication: | 2013 |
Publishing Institution: | Universität Augsburg |
Granting Institution: | Universität Augsburg |
Date of final exam: | 2013/08/30 |
Release Date: | 2022/11/02 |
Pagenumber: | 101 |
Note: | Dissertation: Johannes Gutenberg-Universität, Mainz, 2013 |
DOI: | https://doi.org/10.25358/openscience-1788 |
Institutes: | Mathematisch-Naturwissenschaftlich-Technische Fakultät |
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik | |
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik V | |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Licence (German): | Deutsches Urheberrecht |