Spin effects in ferromagnetic single-electron transistors
Abstract
Electron tunneling in ferromagnetic single-electron transistors is considered theoretically in the sequential tunneling regime. A new formalism is developed, which operates in a two-dimensional space of states, instead of one-dimensiona space used in the spinless case. It is shown that spin fluctuations can be significantly larger than the charge fluctuations. The influence of discrete energy spectrum of a small central electrode on tunneling current, charge and spin accumulation, charge and spin fluctuations, and on tunnel magnetoresistance is analyzed in details. Two different scales are found in the bias dependence of the basic transport characteristics; the shorter one originates from the discrete energy spectrum and the longer one from discrete charging of the central electrode. The features due to discrete spectrum and discrete charging disappear at high temperatures.
Keywords
Cite
@article{arxiv.cond-mat/0010256,
title = {Spin effects in ferromagnetic single-electron transistors},
author = {J. Barnas and J. Martinek and G. Michalek and B. R. Bulka and A. Fert},
journal= {arXiv preprint arXiv:cond-mat/0010256},
year = {2009}
}
Comments
RevTeX, 25 pages, 10 figures, revised and accepted by Phys. Rev. B