Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 6: Skyrmions I
MA 6.2: Talk
Monday, March 17, 2025, 15:30–15:45, H16
Skyrmion dynamics in Ta/CoFeB/MgO at room temperature — •Hauke Lars Heyen1, Malte Römer-Stumm2, Michael Vogel2, Florian Gossing2, Jakob Walowski1, Ethan Andrew Mullen3, Christian Denker1, Karin Dahmen3, Jeffrey McCord2, and Markus Münzenberg1 — 1Institute of Physics, University Greifswald, Germany — 2Institute of Materials Science, Nanoscale Magnetic Materials and Magnetic Domains, CAU Kiel, Germany — 3Department of Physics, The Grainger College of Engineering, University of Illinois Urbana-Champaign, USA
Applications in future storage devices, like the conceptual skyrmion race-track memory, require fundamental control over the skyrmion dynamics. We use Ta/CoFeB/MgO layer stacks to generate skyrmions at room temperature. The skyrmions are moved by applying nanosecond electric current pulses with current densities of around 5 · 1010 A/m2 and are imaged with the magneto optical Kerr effect (MOKE). With a tracking algorithm the trajectories are determined and they hint at two diffusion types and the skyrmion-Hall effect. The latter occurs simultaneously with the topological Hall-effect that can be measured electrically. Combining the electrical measurements with MOKE allows us to separate the anomalous and the weak topological Hall effect. This allows for a differentiation between topological and non-topological stabilized magnetic structures.
Keywords: Skyrmion; Dynamics; Room temperature; MOKE; Hall-effect