Implementation of a non-equilibrium Green's function method to calculate spin transfer torque

TL;DR

This paper introduces a Green's function-based method using the Keldysh approach to compute spin transfer torque in magnetic junctions, demonstrated on Co/Cu/Co systems.

Contribution

The paper presents a novel implementation of the steady state Keldysh Green's function approach within a multiple scattering scheme for calculating non-equilibrium spin densities and torques.

Findings

Successfully computed spin transfer torque in Co/Cu/Co junctions.

Demonstrated the method's effectiveness in systems with magnetoresistance.

Provided insights into spin dynamics in metallic magnetic junctions.

Abstract

We present an implementation of the steady state Keldysh approach in a Green's function multiple scattering scheme to calculate the non-equilibrium spin density. This density is used to obtain the spin transfer torque in junctions showing the magnetoresistance effect. We use our implementation to study the spin transfer torque in metallic Co/Cu/Co junctions.