Spin Transfer Torques induced by Spin Hall Effect

TL;DR

This paper provides a theoretical analysis of how spin Hall effect induces spin accumulation and transfer torques in ferromagnetic-paramagnetic bi-layer structures, highlighting the potential for efficient torque generation and geometric optimization.

Contribution

It introduces analytical and numerical solutions for spin diffusion equations considering spin Hall effect, demonstrating how structure geometry influences spin torque efficiency.

Findings

Spin Hall effect can efficiently generate spin transfer torques.

Geometry modifications can enhance spin torque effects.

Theoretical models match potential experimental observations.

Abstract

Spin accumulation and spin transfer torques induced by Spin Hall Effect in bi-layer structures comprising ferromagnetic and paramagnetic materials are theoretically investigated. The charge and spin diffusion equations taking into account spin-flip and spin Hall effect are formulated and solved analytically and numerically for in structures with simplified and complex geometry, respectively. It is demonstrated that spin torques could be efficiently produced by means of Spin Hall effect which may be further enhanced by modifying structure geometry.