Spin-accumulation in small ferromagnetic double barrier junctions

TL;DR

This paper investigates how non-equilibrium spin accumulation affects transport in small ferromagnetic double barrier junctions, revealing enhanced magnetoresistance and transient effects that serve as experimental signatures of spin accumulation.

Contribution

It introduces a generalized theory of Coulomb blockade to describe spin accumulation effects in small ferromagnetic junctions, predicting unique transient transport phenomena.

Findings

Spin accumulation enhances magnetoresistance.

Reversed current observed on spin-flip relaxation times.

Transient non-linear transport provides evidence of spin accumulation.

Abstract

The non-equilibrium spin accumulation in ferromagnetic double barrier junctions is shown to govern the transport in small structures. Transport properties of such systems are described by a generalization of the theory of the Coulomb blockade. The spin accumulation enhances the magnetoresistance. The transient non-linear transport properties are predicted to provide a unique experimental evidence of the spin-accumulation in the form of a reversed current on time scales of the order of the spin-flip relaxation time.