Reversal and Termination of Current-Induced Domain Wall Motion via Magnonic Spin-Transfer Torque

TL;DR

This paper explores how magnonic spin-transfer torque can reverse or stop current-induced domain wall motion in ferromagnetic wires, considering effects of spin-orbit coupling, offering new ways to control magnetic domain walls.

Contribution

It demonstrates the ability to reverse or terminate domain wall motion using magnonic spin-transfer torque, incorporating effects of Rashba spin-orbit interactions, which is a novel control mechanism.

Findings

Current-induced domain wall motion can be reversed by magnonic spin-transfer torque.

Domain walls can be pinned or stopped by generating spin-waves.

Strong spin-orbit interactions influence the domain wall dynamics.

Abstract

We investigate the domain wall dynamics of a ferromagnetic wire under the combined influence of a spin-polarized current and magnonic spin-transfer torque generated by an external field, taking also into account Rashba spin-orbit coupling interactions. It is demonstrated that current-induced motion of the domain wall may be completely reversed in an oscillatory fashion by applying a magnonic spin-transfer torque as long as the spin-wave velocity is sufficiently high. Moreover, we show that the motion of the domain wall may be fully terminated by means of the generation of spin-waves, suggesting the possibility to pin the domain-walls to predetermined locations. We also discuss how strong spin-orbit interactions modify these results.