Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.12: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster C
Current driven skyrmion movement and their electrical detection in Ta/CoFeB/MgO — •Hauke Lars Heyen1, Malte Römer-Stumm2, Jakob Walowski1, Christian Denker1, Kornel Richter2, Jeffrey McCord2, and Markus Münzenberg1 — 1Institute for Physics, University Greifswald, Germany — 2Institute for Materials Science, Nanoscale Magnetic Materials and Magnetic Domains, CAU Kiel, Germany
Magnetic skyrmions are two-dimensional topological protected round spin structures. They have a strong potential for application in future storage devices like the conceptual skyrmion race-track memory. Such an implementation requires fundamental control over the dynamics of skyrmion motion and reliable tools for their detection. Skyrmions can be generated in Ta/CoFeB/MgO layer stacks at room temperature. Nanosecond electric current pulses on the nanosecond scale enable relocating the skyrmions using current densities from 10^12 - 10^13 A/m^2. The dynamic trajectories hint at the skyrmion-Hall effect and superdiffusion. The skyrmion-Hall effect results from the skyrmion topology, and the superdiffusion occurs due to defects on the motion path. Magnetic tunnel junctions (MTJ) are a promising tool to detect small magnetization changes. The selected Ta/CoFeB/MgO material system allows integrating MTJs into skyrmion samples. However, this integration of MTJs remains challenging, even though they work fine independently.
Keywords: Ta/CoFeB/MgO; Skyrmion-Hall effect; Superdiffusion; MTJ; Skyrmion movement