Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 29: Skyrmions II
MA 29.8: Vortrag
Mittwoch, 19. März 2025, 17:00–17:15, H20
Imaging Topological Defect Dynamics Mediating 2D Skyrmion Lattice Melting — Maarten A. Brems1, Tobias Sparmann1, •Simon M. Fröhlich1, Leonie-C. Dany1, Jan Rothörl1, Fabian Kammerbauer1, Elizabeth M. Jefremovas1, Oded Farago2, Mathias Kläui1, and Peter Virnau1 — 1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Ger many — 2Biomedical Engineering Department, Ben Gurion University of the Negev, Be’er Sheva 84105, Israel
We demonstrate fully quantitative Thiele model simulations of magnetic skyrmion dynamics on previously unattainable experimentally relevant large length and time scales by ascertaining the key missing parameters needed to calibrate the experimental and simulation time scales and current-induced forces. Our work allows us to determine complete spatial pinning energy landscapes that enable quantification of experimental studies of diffusion in arbitrary potentials within the Lifson-Jackson framework. Our method enables us to ascertain the time scales, and by isolating the effect of ultra-low current density (order 106 A/m2) generated torques we directly infer the total force acting on the skyrmion for a quantitative modelling. [2]
[1] S. Lifson and J. L. Jackson, J. Chem. Phys. 36, 2410 (1962). [2] M. A. Brems et al., Phys. Rev. Lett., (2024) (accepted for publication)
Keywords: Skyrmion Pinning; Thiele-Model Simulation; Current-induced Force; Skyrmions; Simulation Time Scale