Domain wall motion in a diffusive weak ferromagnet

TL;DR

This paper investigates how spin currents from a strong ferromagnet can induce and control domain wall motion in a disordered weak ferromagnet, providing theoretical insights and a potential measurement method.

Contribution

It offers a theoretical framework for understanding domain wall dynamics driven by spin currents in disordered weak ferromagnets, including a proposed detection technique.

Findings

Calculated force and torque on domain walls due to spin currents

Analyzed domain wall dynamics in disordered weak ferromagnets

Suggested a measurement method via resistance changes

Abstract

We study the domain wall motion in a disordered weak ferromagnet, induced by injecting a spin current from a strong ferromagnet. Starting from the spin diffusion equation describing the spin accumulation in the weak ferromagnet, we calculate the force and torque acting on the domain wall. We also study the ensuing domain wall dynamics, and suggest a possible measurement method for detecting the domain wall motion via measuring the additional resistance.