Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Spin Dynamics and Transport: Domain Walls
MA 28.1: Vortrag
Dienstag, 21. März 2017, 14:00–14:15, HSZ 401
Inertia-Free Thermally Driven Domain-Wall Motion in Antiferromagnets — •Severin Selzer1, Unai Atxitia1, Ulrike Ritzmann2, Denise Hinzke1, and Ulrich Nowak1 — 1Universität Konstanz — 2Johannes Gutenberg-Universität Mainz
Induced domain wall motion is the key to an efficient and fast control of magnetic nanostructures. Due to their complex spin structures leading to higher spin dynamics than in ferromagnets, antiferromagnets are promising candidates as materials for future devices.
Domain-wall motion in antiferromagnets triggered by thermally induced magnonic spin currents is studied theoretically. It is shown by numerical calculations based on a classical spin model that the wall moves towards the hotter regions, as in ferromagnets. However, for larger driving forces the so-called Walker breakdown - which usually speeds down the wall - is missing. This is due to the fact that the wall is not tilted during its motion. For the same reason antiferromagnetic walls have no inertia and, hence, no acceleration phase leading to higher effective mobility (Phys. Rev. Lett. 117, 107201).