Spin Hall Effect-driven Spin Torque in Magnetic Texture

TL;DR

This paper theoretically investigates how the spin Hall effect influences spin torque and magnetization dynamics in magnetic textures, revealing significant modifications to domain wall motion due to the interplay of Hall angle and non-adiabaticity.

Contribution

It introduces a new form of spin torque induced by the spin Hall effect in magnetic textures and analyzes its impact on domain wall dynamics.

Findings

Spin Hall effect induces a significant spin torque in magnetic textures.

The new torque can alter the dynamics of transverse and vortex domain walls.

The effects depend on the Hall angle and non-adiabaticity parameter.

Abstract

Current-induced spin torque and magnetization dynamics in the presence of spin Hall effect in magnetic textures is studied theoretically. The local deviation of the charge current gives rise to a current-induced spin torque of the form (1-\beta{\bf M})x[({\bf u}_0+\alpha_H{\bf u}_0x\bf M})\cdot{\bm \nabla}]{\bf M}, where {\bf u}_0 is the direction of the injected current, \alpha_H is the Hall angle and \beta is the non-adiabaticity parameter due to spin relaxation. Since \alpha_H and \beta can have a comparable order of magnitude, we show that this torque can significantly modify the current-induced dynamics of both transverse and vortex walls.