Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Ultrafast Magnetization Effects II
MA 38.10: Talk
Wednesday, March 11, 2026, 17:30–17:45, POT/0361
All-optical stochastic switching of magnetisation textures in Fe3Sn2 — •Andras Kovacs1, Jonathan Weber2, Michalis Charilaou3, Rafal Dunin-Borkowski1, and Sascha Schaefer2 — 1Ernst Ruska-Centre, Forschungszentrum Jülich, Germany — 2Regensburg Center for Ultrafast Nanoscopy, University of Regensburg, Regensburg, Germany — 3Department of Physics, University of Louisiana at Lafayette, USA
We utilize femtosecond optical pulses to alter the helicity of the magnetic spin configuration in dipolar skyrmions formed in the kagome magnet Fe3Sn2 in the absence of an external magnetic field and at room temperature. In situ Lorentz transmission electron microscopy is used to visualise the light-induced stochastic switching process of chiral Néel caps, while the internal Bloch component of the dipolar skyrmions remains unchanged. To corroborate the spin states and the light-induced magnetisation dynamics, micromagnetic modelling and simulations of the resulting electron phase shift maps are conducted to elucidate the spin rearrangement induced by individual femtosecond optical pulses [1]. We acknowledge the scientific support to D. Kong, L. Prodan, V. Tsurkan, A. Schroder, N. Kiselev, I Kezsmarki, A. Tavabi and the financial support to EU grant No. 856538. [1] A. Kovacs etal, Comm. Mater. 6, 223 (2025)
Keywords: skyrmion; ultrafast magnetization; transmission electron microscopy; micromagnetics