Geometry-induced motion of magnetic domain walls in curved nanostripes

Kostiantyn V. Yershov, Volodymyr P. Kravchuk, Denis D. Sheka, Oleksandr V. Pylypovskyi, Denys Makarov, Yuri Gaididei

Published 2018-05-11Version 1

Dynamics of topological magnetic textures are typically induced externally by, e.g.~magnetic fields or spin/charge currents. Here, we demonstrate the effect of the internal-to-the-system geometry-induced motion of a domain wall in a curved nanostripe. Being driven by the gradient of the curvature of a biaxial stripe, transversal domain walls acquire remarkably high velocities of up to 100 m/s and do not exhibit any Walker-type speed limit. We pinpoint that the inhomogeneous distribution of the curvature-induced Dzyaloshinskii--Moriya interaction is a driving force for the motion of a domain wall. Although we showcase our approach on the specific Euler spiral geometry, the approach is general and can be applied to a wide class of geometries.