Electric field control of magnon-induced magnetization dynamics in multiferroics

TL;DR

This paper theoretically demonstrates that electric fields can significantly control magnetization dynamics and domain wall motion in multiferroics through magnon-mediated effects, enabling efficient low-dissipation magnetic switching.

Contribution

It introduces a theoretical model showing electric field control of magnetization and domain walls in multiferroics via magnon-induced torques, with enhanced effects compared to other systems.

Findings

Electric fields induce large magnetization reorientation.

Electric tuning of domain wall speed and direction.

Magnon-mediated effects produce velocities several times zero-field speed.

Abstract

We consider theoretically the effect of an inhomogeneous magnetoelectric coupling on the magnon-induced dynamics of a ferromagnet. The magnon-mediated magnetoelectric torque affects both the homogeneous magnetization and magnon-driven domain wall motion. In the domains, we predict a reorientation of the magnetization, controllable by the applied electric field, which is almost an order of magnitude larger than that observed in other physical systems via the same mechanism. The applied electric field can also be used to tune the domain wall speed and direction of motion in a linear fashion, producing domain wall velocities several times the zero field velocity. These results show that multiferroic systems offer a promising arena to achieve low-dissipation magnetization rotation and domain wall motion by exciting spin-waves.