Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Skyrmions III (joint session MA/TT)

TT 45.7: Vortrag

Mittwoch, 18. März 2020, 16:30–16:45, POT 6

Tuning the topology flip of magnetic skyrmions by an in-plane magnetic fieldFlorian Muckel1, Stephan von Malottki2, Christian Holl1, Benjamin Pestka1, Marco Pratzer1, Pavel F. Bessarab3, Stefan Heinze2, and •Markus Morgenstern11II. Institute of Physics B, RWTH Aachen University and JARA-FIT, Germany — 2Institute of Theoretical Physics and Astrophysics, University of Kiel, Germany — 3University of Iceland, Reykjavík, Iceland and ITMO University, St. Petersburg, Russia

Topological protection of magnetic skyrmions on a discrete lattice manifests itself in an energy barrier that can be overcome by local heating, for example by a tunneling electron. Here we use spin polarized scanning tunneling microscopy at 7 K to probe the current induced collapse of magnetic skyrmions in the Pd/Fe bilayer on Ir(111) as a function of the in-plane magnetic field B .The collapse rate caused by single hot electrons is tuned by four orders of magnitude via B. We aim a more detailed understanding of the skyrmion collapse mechanism by locally mapping the collapse rate and deduce a change from a radially symmetric shrinkage of the skyrmion [1] towards a zipper-like Chimera collapse mechanism predicted by theory [2].

[1] Bessarab et. al. Comp. Phys. Comm. 196, (2015). [2] Meyer et. al. Nat. Commun. 10, (2019)

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