Spin accumulation in a quantum cluster resolved in tunnel junctions

A. Brataas, M. Hirano, J. Inoue, Y. V. Nazarov, G. E.W. Bauer

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Transport through a small metal island attached to two ferromagnetic reservoirs by tunnel junctions is considered. The discrete energy levels due to size quantization, the Coulomb charging energy and the non-equilibrium spin accumulation due to the spin-dependent tunneling rates are taken into account. Analytical results for the zero-bias conductance and magnetoresistance are found. In the nonlinear current-voltage regime, numerical calculations reveal discrete jumps in the tunnel magnetoresistance when the applied voltage is in resonance with the energy difference associated with tunneling of an electron into the ground or excited states of the quantum cluster. Effects of spin-dependent discrete energy levels in magnetic quantum clusters on the tunnel magnetoresistance are studied in detail.

Original languageEnglish
Pages (from-to)2329-2335
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume40
Issue number4 A
Publication statusPublished - 2001 Apr 1
Externally publishedYes

Keywords

  • Coulomb blockade
  • Ferromagnetic tunnel junction
  • Magnetoresistance
  • Spin accumulation

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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