Theory of spin effect on Coulomb blockade of single-electron tunneling in ferromagnetic system

TL;DR

This paper presents a theoretical model exploring how spin effects influence Coulomb blockade phenomena in ferromagnetic single-electron tunneling systems, highlighting spin accumulation and fluctuations.

Contribution

A new theoretical framework incorporating charge and spin degrees of freedom for analyzing spin-dependent tunneling in ferromagnetic junctions.

Findings

Identification of spin accumulation effects

Prediction of spin fluctuations impact

Enhanced understanding of spin-dependent Coulomb blockade

Abstract

Spin dependent single electron tunneling in a ferromagnetic double junction is investigated theoretically in the limit of incoherent sequential tunneling. The junction consists of a small nonmagnetic metallic grain with discrete energy levels, which is connected to two ferromagnetic electrodes. We have developed a new theoretical model taking into account charge as well as spin degrees of freedom. The model allows us to investigate new phenomena such as spin accumulation and spin fluctuations.