Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: INNOMAG e.V. Dissertationspreis 2019 / Ph.D. Thesis Prize

MA 14.2: Vortrag

Dienstag, 2. April 2019, 10:00–10:30, H48

Spin-Orbit-Induced Dynamics of Chiral Magnetic Structures - Skyrmion Dynamics in Thin Film Devices at Varying Temperatures — •Kai Litzius — Institute of Physics, Johannes Gutenberg-University, 55099 Mainz, Germany — Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany — Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany

Magnetic skyrmions are nanoscale magnetic quasi-particles with spherical topology. They are promising candidates for future spintronic devices such as the skyrmion racetrack memory. Interfacial systems, as studied here, cannot only provide a Dzyaloshinskii-Moriya interaction that stabilizes skyrmions, but also efficient spin dynamics, making them extremely promising for applications. This talk will provide an overview over the progress within the field of skyrmionics during the past four years. Special focus will be placed on the discovery of a sizable and drive dependent skyrmion Hall angle (SkHA) and the different theoretical models that have been put forward for the creep [1,2] and viscous flow [3] regime to explain this behavior. By X-ray microscopy with temperature control, we find that the underlying mechanism of the SkHA is independent of the temperature and identify the different mechanisms that lead to distinctly different angles in the creep and the flow regimes. Furthermore, we find highly temperature dependent skyrmion speeds and that higher temperatures are beneficial for efficient skyrmion motion. References: [1] Jiang et al., Nat. Phys. 13, 162-169 (2017). [2] Reichhardt & Reichhardt, New J. Phys. 18, 095005 (2016). [3] Litzius et al., Nat. Phys. 13, 170-175 (2017).