Voltage-controlled motion of transverse domain walls in cubic magnetostrictive materials under transverse magnetic field

Abstract

This work examines the dynamic features of Néel-type transverse domain walls within a thin cubic crystal magnetostrictive material tightly coupled with a thick piezoelectric actuator under the combined effects of transverse and axial (driving) magnetic fields, current density, voltage-generated electric field, magnetocrystalline anisotropy, magnetoelastic field and the crystal symmetry of the material. The investigation is performed within the framework of the one-dimensional Landau–Lifshitz–Gilbert equation. We introduce a trial function based on the Schryer and Walker approach and employ the small angle approximation technique to determine the explicit expression of key parameters such as domain wall profile, width, velocity, displacement, and excitation angle. Our results indicate that the transverse magnetic field significantly increases the domain wall velocity for the field-driven motion; however, it does not affect the velocity in the current-driven one. Moreover, magnetostriction, voltage-generated electric field, and cubic anisotropy provide additional control to suitably tune the domain wall width, velocity, and displacement. These factors can effectively manipulate field-driven DW mobility via DW width; however, do not alter current-driven DW one. Our findings show good qualitative agreement with recent observations.