Spin effects in single-electron tunneling in magnetic junctions

TL;DR

This paper theoretically analyzes spin-dependent single-electron tunneling in ferromagnetic double junctions, focusing on how the discrete energy spectrum affects spin accumulation, fluctuations, and tunnel magnetoresistance, especially in nonmagnetic islands.

Contribution

It provides a numerical analysis of the influence of discrete energy spectra on spin effects in single-electron tunneling, including spin fluctuations in magnetic and nonmagnetic junctions.

Findings

Spin fluctuations are significant in both magnetic and nonmagnetic junctions.

Discrete energy spectrum influences spin accumulation and tunnel magnetoresistance.

Numerical results highlight the role of energy quantization in spin-dependent tunneling.

Abstract

Spin dependent single electron tunneling in ferromagnetic double junctions is analysed theoretically in the limit of sequential tunneling. The influence of discrete energy spectrum of the central electrode (island)on the spin accumulation, spin fluctuations and tunnel magnetoresistance is analysed numerically in the case of a nonmagnetic island. It is shown that spin fluctuations are significant in magnetic as well as in nonmagnetic junctions.