Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 12: Skyrmions 1 (joint session MA/KFM)

KFM 12.2: Vortrag

Dienstag, 6. September 2022, 10:00–10:15, H37

Controlling Magnetic Skyrmion Nucleation and Motion — •Lisa-Marie Kern1, Victor Deinhart1,4, Kathinka Gerlinger1, Michael Schneider1, Dieter Engel1, Christian Günther2,3, Katja Höflich4,5, Riccardo Batistelli4, Daniel Metternich4, Felix Büttner4, Bastian Pfau1, and Stefan Eisebitt1,31Max-Born-Institut, Berlin, Germany — 2Zentraleinrichtung für Elektronenmikroskopie (ZELMI), Technische Universität, Berlin, Germany — 3Institut für Optik und Atomare Physik, Technische Universität, Berlin, Germany — 4Helmholtz Zentrum für Materialien und Energie, Berlin, Germany — 5Ferdinand-Braun-Institut, Berlin, Germany

Magnetic skyrmions are topological quasiparticles, stabilized in out-of-plane magnetized multilayers. Great advances have been reported in generating, annihilating and shifting skyrmions via spin-orbit torque from spin-polarized currents. Optical nucleation with single laser pulses offers a possibly faster and more energy-efficient alternative. While the underlying mechanisms of the nucleation are different, both methods suffer from a certain stochasticity in the spatial distribution of the skyrmions nucleated. However, in view of scientific and practical applications, a controllable localization of the skyrmion's nucleation site is typically required. Nanopatterning of a tailored magnetic anisotropy landscape using He+-ions provides a promising platform for enhanced control of skyrmions in thin films. Based on this technique, we have recently demonstrated reproducible skyrmion nucleation and motion - a prerequisite for any fundamental or applied research on topological structures.

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