Shot noise in a diffusive F-N-F spin valve

TL;DR

This paper investigates how spin-flip scattering in a diffusive ferromagnet-normal-ferromagnet spin valve significantly increases shot noise, approaching Poissonian levels, especially in the giant magnetoresistance regime.

Contribution

It reveals a new source of shot noise enhancement due to spin-flip scattering in diffusive spin valves, expanding understanding of current fluctuations in spintronic devices.

Findings

Spin-flip scattering strongly enhances shot noise.

Fano factor approaches Poissonian value under certain conditions.

Shot noise is significantly affected in the giant magnetoresistance regime.

Abstract

Fluctuations of electric current in a spin valve consisting of a diffusive conductor connected to ferromagnetic leads and operated in the giant magnetoresistance regime are studied. It is shown that a new source of fluctuations due to spin-flip scattering enhances strongly shot noise up to a point where the Fano factor approaches the full Poissonian value.