Authors:	Gruber, Raphael Zázvorka, Jakub Brems, Maarten A. Rodrigues, Davi R. Dohi, Takaaki Kerber, Nico Seng, Boris Vafaee, Mehran Everschor-Sitte, Karin Virnau, Peter Kläui, Mathias
Title:	Skyrmion pinning energetics in thin film systems
Online publication date:	1-Aug-2022
Year of first publication:	2022
Language:	english
Abstract:	Skyrmions, topological spin textures, can be pinned by defects present in the material that hosts them, influencing their motion. Here, Gruber et al show that the skyrmions are pinned at their boundary where the finite size of the skyrmions governs their pinning, and they demonstrate that certain pinning sites can switched on and off in-situ. A key issue for skyrmion dynamics and devices are pinning effects present in real systems. While posing a challenge for the realization of conventional skyrmionics devices, exploiting pinning effects can enable non-conventional computing approaches if the details of the pinning in real samples are quantified and understood. We demonstrate that using thermal skyrmion dynamics, we can characterize the pinning of a sample and we ascertain the spatially resolved energy landscape. To understand the mechanism of the pinning, we probe the strong skyrmion size and shape dependence of the pinning. Magnetic microscopy imaging demonstrates that in contrast to findings in previous investigations, for large skyrmions the pinning originates at the skyrmion boundary and not at its core. The boundary pinning is strongly influenced by the very complex pinning energy landscape that goes beyond the conventional effective rigid quasi-particle description. This gives rise to complex skyrmion shape distortions and allows for dynamic switching of pinning sites and flexible tuning of the pinning.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-7470
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Nature Communications 13
Pages or article number:	3144
Publisher:	Nature Publishing Group UK
Publisher place:	London
Issue date:	2022
ISSN:	2041-1723
Publisher DOI:	10.1038/s41467-022-30743-4
Appears in collections:	DFG-491381577-G