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O: Fachverband Oberflächenphysik
O 25: Poster Session II: Surface magnetism II
O 25.4: Poster
Monday, March 1, 2021, 13:30–15:30, P
Chimera-type skyrmion collapse revealed by sub-nm maps of the transition rate — •Stephan von Malottki1, Florian Muckel2, Christian Holl2, Benjamin Pestka2, Marco Pratzer2, Pavel F. Bessarab3,4, Stefan Heinze1, and Markus Morgenstern2 — 1ITAP, University of Kiel — 2Institute of Physics B and JARA-FIT, RTWH Aachen University — 3University of Iceland, Reykjavík — 4ITMO University, St. Petersburg
In addition to the conventional radial symmetric collapse of magnetic skyrmions, recent studies predicted the occurrence of skyrmion annihilation processes via the chimera skyrmion state [1-3]. Here, we demonstrate the realization of both the radial symmetric and the chimera transition mechanism in the ultra-thin film system fcc-Pd/Fe/Ir(111) [4]. Scanning tunneling microscopy is used to create transition rate maps of magnetic switching events induced by single electron events. In combination with energy density maps of the transition states obtained by atomistic spin simulations parametrized from first principles, they allow for the identification of both annihilation mechanisms. It is further shown, that a transition between both mechanisms can be achieved by the application of external in- and out-of-plane magnetic fields, yielding a sound agreement between experiment and theory.
[1] Meyer et al., Nat. Commun. 10, 3823 (2019)
[2] Heil et al., Phys. Rev. B 100, 134424 (2019)
[3] Desplat et al., Phys. Rev. B 99, 174409 (2019)
[4] Muckel et al., Nat. Phys. (2021)
https://doi.org/10.1038/s41567-020-01101-2