Berlin 2024 – wissenschaftliches Programm

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SYSD: Symposium SKM Dissertation Prize 2024

SYSD 1: SKM Dissertation Prize

SYSD 1.2: Hauptvortrag

Montag, 18. März 2024, 10:00–10:30, H 1012

Controlled Manipulation of Magnetic Skyrmions: Generation, Motion and Dynamics — •Lisa-Marie Kern — Max Born Institute, Berlin, Germany

The controlled manipulation of spins is central in spintronics research. Competing interactions can lead to complex nanoscale spin textures, potentially, stabilized by a non-trivial topology. The magnetic skyrmion is the prototypical topological spin texture, possessing unity topological charge. In view of applications in data storage and processing and for their investigation as ideal test ground for topological textures in general, a reliable position control is typically required. We thus developed two control mechanisms based on reflective masks or via focused ion beam irradiation to demonstrate the deterministic formation and manipulation of current- and laser-induced magnetic skyrmions in cobalt-based multilayers. With the level of precision achieved, individual skyrmions can now be controlled on the nanometer-scale and their motion be guided in desired ways. Further, their deterministic generation allowed us to record movies of a spin-orbit torque driven skyrmion interacting with a tailored anisotropy defect, thereby accessing the fundamental character of the topological charge and its magnetization dynamics. Together with my colleagues, I investigated these magnetic skyrmions in real-space soft-x-ray imaging experiments. We established a promising platform to study isolated topological textures under controlled conditions which may improve our general understanding of their emergence and intrinsic magnetization dynamics on ps-timescales and with nm-spatial resolution.

Keywords: magnetic skyrmions; magnetic thin films; x-ray imaging