Current-induced motion of a domain wall in magnetic nanowires

TL;DR

This paper investigates the dynamics of current-induced magnetic domain wall motion in nanowires, focusing on the effects of spin torque components on the wall's movement and shape distortion.

Contribution

It provides a detailed calculation of spin torque effects on sharp domain walls in ferromagnetic nanowires, highlighting the roles of different torque components.

Findings

Identified two components of spin torque affecting domain wall motion.

Demonstrated how current influences domain wall shape and position.

Analyzed the impact of anisotropy on domain wall dynamics.

Abstract

The dynamics of current-induced motion of a magnetic domain wall in a quasi-one-dimensional ferromagnet with both easy-axis and easy-plane anisotropy, is studied. We pay a special attention to the case of a sharp domain wall, and calculate the spin torque created by the electric current. The torque has two components, one of which is acting as a driving force for the motion of the domain wall while the other distorts its shape, forcing thus the magnetic moments to deviate from the easy plane.