Domain-wall-controlled transverse spin injection

TL;DR

This paper introduces a novel effect where domain walls in ferromagnets enable electric currents to inject pure spin currents into adjacent metals, affecting spin transfer and domain-wall motion, with potential for device control.

Contribution

It proposes a new mechanism for spin injection via domain walls and analyzes its impact on spin transfer and domain-wall dynamics in layered magnetic systems.

Findings

Calculated inverse spin-Hall voltage from spin currents at domain walls.

Showed how this effect modifies parameters governing domain-wall motion.

Demonstrated potential for controlling spin-current injection locations in devices.

Abstract

We propose an effect whereby an electric current along the interface between a ferromagnetic and normal metal leads to injection of pure spin current into the normal metal, if the magnetization-direction in the ferromagnet varies along the direction of current. For the specific example of a ferromagnetic domain wall, we compute the inverse spin-Hall effect voltage this spin current gives rise to when injected into a Pt layer. Furthermore, we show that this pure spin current leads to modification of the parameters that govern spin transfer and current-driven domain-wall motion, which can be use to optimize the latter in layered magnetic systems. This effect in principle enables control over the location of spin-current injection in devices.