Spin orbit induced torque in collinear spin valve structuer and associated entropy

TL;DR

This paper predicts a spin-orbit interaction-induced torque in collinear spin valve structures and explores its effects on entropy and polarization transport using a scattering theory approach.

Contribution

It introduces a scattering theory for spin density matrices to quantitatively analyze spin-orbit induced torque and entropy behavior in spin valves.

Findings

Spin-orbit interaction causes torque even in parallel spin configurations.

Von-Neumann entropy exhibits non-linear and oscillatory behavior with respect to angle and SO strength.

Theoretical framework enables detailed analysis of spin transport phenomena.

Abstract

We predict that due to spin-orbit(SO) interaction there is a torque even for the parallel configuration of spin valve structure (F1/2DEG/F2). This torque arises due to spin orbit interaction. We develop a scattering theory for spin density matrix which allows us to study this effect quantitatively. Further we show that the von-Neumann entropy associated with transport of polarization can show non-linear behavior as a function of absolute angle and oscillator behavior as a function of SO interaction strength.