Electric-Field Control over Spin-Wave and Current Induced Domain Wall Motion and Magnonic Torques in Multiferroics

TL;DR

This paper demonstrates how electric fields can control spin-wave induced domain wall motion and magnetization dynamics in multiferroics, revealing new electrical manipulation methods for magnetic textures.

Contribution

It introduces a novel mechanism for electric-field control of spin-waves and domain walls in multiferroics, including the interaction with electric currents and the scaling of Walker breakdown threshold.

Findings

Spin-waves can induce domain wall motion and magnetization dynamics.

Electric fields can control the direction and behavior of domain walls.

The Walker breakdown threshold scales with perpendicular electric field.

Abstract

We discover that the way spin-waves exert magnetic torques in multiferroic materials can cause not only domain wall motion, but also magnetization dynamics for homogeneous magnetization textures. Interestingly, the domain wall motion can be controlled via purely electrical means with the spin-waves being generated by an ac electric field $E$ while the direction of the wall motion also is sensitive to an applied dc $E$ field. Moreover, we determine the interaction between spin-transfer torque from an electric current and a magnetic domain wall in multiferroics and show that the Walker breakdown threshold scales with the magnitude of a perpendicular electric field, offering a way to control the properties of domain wall propagation via electric gating.