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MA: Fachverband Magnetismus

MA 6: Skyrmions I

MA 6.7: Vortrag

Montag, 17. März 2025, 17:00–17:15, H16

Skyrmion size manipulation by external force — Klaus Raab, Kilian Leutner, •Leonie-Charlotte Dany, Simon Fröhlich, Grischa Beneke, Duc Minh Tranh, Sachin Krishnia, Robert Frömter, Peter Virnau, and Mathias Kläui — Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany

Magnetic skyrmions, spin textures with quasi-particle like properties, exhibit highly promising potential as information carriers in applications like storage or non-conventional computing.^1,2

We experimentally investigate how the size of skyrmions is influenced by a combination of spin-orbit torques and repulsion from a structural barrier in a Ta/CoFeB/MgO based magnetic thin film. By employing Ga⁺ ion implantation to modify the effective anisotropy of the magnetic layer, we create artificial barriers that serve as additional tools for manipulating skyrmions. Furthermore, the resulting changes in the formation of skyrmions lattice is characterized.

Based on the experimental finding, we then develop a new theoretical model within the framework of Thiele equation approach to describe the change in the skyrmions’ size and their trajectories. Thiele equation accounts for the skyrmion size and skyrmion-skyrmion distance of an ensemble of skyrmions to an external stimulus, such as spin-orbit torques.

1. Raab, K. et al., Nat. Commun. 13, 6982 (2022).

2. Beneke, G. et al., Nat. Commun. 15, 8103 (2024).

Keywords: Skyrmion size; skyrmion lattice; skyrmion compression