Spin-transfer in diffusive ferromagnet-normal metal systems with spin-flip scattering

TL;DR

This paper analytically investigates how spin-flip scattering affects spin-transfer in disordered ferromagnet-normal metal systems, revealing that spin-flip in the center reduces transfer, while in outer metals it can enhance it.

Contribution

It provides an analytical calculation of spin-transfer considering spin-flip processes in complex ferromagnet-normal metal systems.

Findings

Spin-flip in the center reduces spin-transfer.

Spin-flip in outer normal metals can increase spin-transfer.

Analytical expressions for spin-transfer with spin-flip effects.

Abstract

The spin-transfer in biased disordered ferromagnet (F) - normal metal (N) systems is calculated by the diffusion equation. For F1-N2-F2 and N1-F1-N2-F2-N3 spin valves, the effect of spin-flip processes in the normal metal and ferromagnet parts are obtained analytically. Spin-flip in the center metal N2 reduces the spin-transfer, whereas spin-flip in the outer normal metals N1 and N3 can increase it by effectively enhancing the spin polarization of the device.