Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 34: Magnetic textures: Transport and dynamics II

MA 34.12: Vortrag

Mittwoch, 3. April 2019, 18:15–18:30, H37

Maximizing Skyrmion Device Efficiency by Engineering the Drive and Temperature Dependence of Skyrmion Dynamics and the Resulting Skyrmion Hall Effect — Kai Litzius^1,2,3, Jonathan Leliaert⁴, Pedram Bassirian¹, Davi Rodrigues¹, Sascha Kromin¹, Ivan Lemesh⁵, Jakub Zazvorka¹, Kyu-Joon Lee¹, Jeroen Mulkers^4,6, •Nico Kerber^1,2, Daniel Heinze¹, Niklas Keil¹, Robert M. Reeve^1,2, Markus Weigand³, Bartel Van Waeyenberge⁴, Gisela Schütz³, Karin Everschor-Sitte^1,2, Geoffrey S. D. Beach⁵, and Mathias Kläui^1,2 — ¹Johannes Gutenberg-University Mainz, 55099 Mainz, Germany — ²Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany — ³Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany — ⁴Ghent University, B-9000 Ghent, Belgium — ⁵Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA — ⁶University of Antwerp, B-2020 Antwerp, Belgium

To reveal the origin of the Skyrmion Hall Angle (SkHA) and the temperature-dependence of the skyrmion dynamics, we investigate skyrmion trajectories at different temperatures and drive-amplitudes. We find the velocities to be strongly temperature-dependent, whereas the mechanism of the SkHA is independent of temperature, with different slopes in the depinning and viscous flow regimes. We explain these slopes by revealing the different underlying mechanisms including skyrmion surface tension and -deformation that sets the limit of the maximum velocity in ferromagnetic devices unless counteracted.