Strain-induced domain wall motion in ferrimagnetic nanowire

Abstract

Controllable magnetic domain walls in ferrimagnets offer great promise as information carriers for future spintronic devices. It is crucial to find low-power-consuming and efficient methods of controlling domain walls. In this work, we propose to use the strain to drive the wall motion in ferrimagnets, and we theoretically reveal the important role of the net angular momentum. When the strain is applied, an anisotropy gradient is induced and effectively drives the wall motion. For a nonzero net angular momentum, the precession torques acting on the two sublattices cannot cancel out each other, which induces a rotation of the wall plane and speed down the wall propagation. Furthermore, the wall dynamics depends on several internal and external parameters, which allows one to manipulate the wall motion through tuning these parameters. Our work provides clear insight into the strain-induced domain wall motion in ferrimagnets, which is meaningful for future spintronic experiments and applications.