Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Skyrmions III

MA 55.8: Talk

Friday, March 13, 2026, 11:30–11:45, HSZ/0004

Current-Induced Skyrmion Dynamics and Diffusion — •Leonie-Charlotte Dany, Maarten Brems, Simon Fröhlich, Tobias Sparmann, Fabian Kammerbauer, Sachin Krishnia, Peter Virnau, and Mathias Kläui — Institute of Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany

Magnetic skyrmions, nanoscale chiral spin textures with particle-like behavior, are promising candidates for information storage and unconventional computing due to their robustness and efficient current-driven motion [1-3]. In Ta/CoFeB/MgO multilayers, we investigate the transition of current-driven skyrmion motion from creep, through depinning, to the viscous flow regime driven by a unipolar, pulsed current. By varying current density, pulse width, and frequency, we demonstrate how external stimulation overcomes pinning potentials and enables skyrmions to enter into a regime characterized by linear velocity-current relations, i.e., the viscous flow regime. Additional studies with an alternating, net-zero current drive reveal an exponential increase of the diffusion coefficient with current density, while higher frequencies suppress diffusion following a power-law dependence. These findings provide quantitative insight into controlling skyrmion mobility and diffusion, essential for spintronic device design [4].

[1] G. Beneke et al., Nat. Commun., 15, 8103 (2024).

[2] K. Raab et al., Nat. Commun., 13, 6982 (2022).

[3] K. Everschor-Sitte et al., J. Appl. Phys., 124, 24, 240901 (2018).

[4] L. Dany et al., under preparation.

Keywords: Skyrmion Dynamics; Skyrmion Diffusion; Current-Induced Motion