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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).