SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.2: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Asymmetric skyrmion flow in a periodically modulated channel — •Klaus Raab1, Maarten A. Brems1, Maurice Schmidt1, Jan Rothörl1, Fabian Kammerbauer1, Peter Virnau1, and Mathias Kläui1,2 — 11Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany — 22Graduate School of Excellence Materials Science in Mainz, Staudingerweg 9, 55128 Mainz, Germany
We investigate the non-equilibrium flow behavior of skyrmions driven by spin-torques in complex channel geometries and construct functional building blocks for targeted manipulation of skyrmion flow. Poiseuille-like velocity flow-profiles usually occur due to no-slip boundary conditions, meaning moving particles do interfere with the boundary e.g. the wall of a geometry, reducing the velocity of particles closer to a wall. Skyrmions on the other hand should experience slip at the boundaries du to the repulsive nature of the skyrmion-edge and skyrmion-skyrmion interaction. Adding structured obstacles along the boundary may lead to partial or even no-slip behavior and thus to Poiseuille-like flow profiles while skyrmions are forced through a wire due to spin-torques. Selected edge shapes (sawtooth, triangles, ...) and the periodicity and amplitude of the modulation of the wire width influencing the flow were optimized and tested using simulations. Understanding flow dynamics and velocity profiles of skyrmions, their interaction with each other and their harboring geometry is essential for skyrmionic applications like the racetrack memory.