Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Skyrmions II
MA 21.3: Talk
Tuesday, March 10, 2026, 14:30–14:45, HSZ/0004
Skyrmion topological Hall effect in Ta/CoFeB/MgO at room temperature detected with Kerr microscopy — •Hauke Lars Heyen1, Michael Vogel2, Florian Gossing2, Jakob Walowski1, Jeffrey McCord2, and Markus Münzenberg1 — 1Institute of Physics, University Greifswald, Germany — 2Institute of Materials Science, Nanoscale Magnetic Materials and Magnetic Domains, CAU Kiel, Germany
The topological Hall effect is interesting for characterizing materials and their non-trivial spin structures. It arises from spin textures with a finite topological charge, such as skyrmions. In this work, we measured the topological Hall effect originating from topologically protected skyrmions in Ta/CoFeB/MgO single-layer films. Since the small topological Hall contribution appears on top of the dominating anomalous Hall effect, its direct detection in this material system is challenging. Electrical Hall effect measurements contain both effects and to separate these, Kerr-microscopy (MOKE) measurements are carried out simultaneously to Hall effect measurements. We further verify the results with thermal and electrical transport measurements to calculate a topological quantity that contains the topological Nernst and Hall effect respectively. Those measurements are conducted using the experimental scheme introduced in [1].
[1] R. Schlitz et al. All Electrical Access to Topological Transport Features in Mn1.8PtSn Films. Nano Letters, 19(4):2366-2370, March 2019.
Keywords: Skyrmion; Topological Hall effect; Ta/CoFeB/MgO; Nernst effect