SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.7: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Current driven skyrmion movement and their electrical detection in Ta/CoFeB/MgO — •Hauke Lars Heyen1, Malte Römer-Stumm2, Jakob Walowski1, Christian Denker1, Kornel Richter2, Jeffey McCord2, and Markus Münzenberg1 — 1Institute of Physics, University of Greifswald, Felix-Hausdorff-Straße 6, 17489 Greifswald, Germany — 2Christian-Albrechts-University in Kiel, Institute for Materials Science, Nanoscale Magnetic Materials and Magnetic Domains, 24143 Kiel, Germany
Magnetic skyrmions, the two-dimensional topological protected round spin structures, have a strong potential for implementation into future storage devices as information bits e.g., in the conceptual racetrack memory. For this purpose, the dynamics of skyrmion motion and their detection is an essential tool. Skyrmions can be generated in Ta/CoFeB/MgO layer stacks at room temperature. Using current pulses in the nanosecond range, it is possible to move the skyrmions with current densities of 10^12 - 10^13 A/m^2. The dynamic trajectories hint to the skyrmion-Hall-effect and superdiffusion, requiring special racetrack design. 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 to build MTJs into skyrmion samples. But this integration of MTJs remains challenging, even though they work fine independently.