Current induced distortion of a magnetic domain wall

TL;DR

This paper investigates how a ballistic current induces spin torque on a magnetic domain wall, causing it to distort and develop a periodic structure due to internal spin precession effects.

Contribution

It introduces the concept of internal torque structure caused by electron spin precession, leading to domain wall distortion under current flow.

Findings

Domain wall profile becomes periodically distorted under current.

Internal spin precession significantly influences domain wall behavior.

Current induces a complex torque structure beyond simple pressure.

Abstract

We consider the spin torque induced by a current flowing ballistically through a magnetic domain wall. In addition to a global pressure in the direction of the electronic flow, the torque has an internal structure of comparable magnitude due to the precession of the electrons' spins at the "Larmor" frequency. As a result, the profile of the domain wall is expected to get distorted by the current and acquires a periodic sur-structure.