Spin-dependent coulomb blockade in ferromagnet/normal-metal/ferromagnet double tunnel junctions

Hiroshi Imamura, Saburo Takahashi, Sadamichi Maekawa

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

We study theoretically the spin-dependent transport in ferromagnet/normal-metal/ferromagnet double tunnel junctions by special attention to cotunneling in the Coulomb blockade region. The spin accumulation caused by cotunneling squeezes the Coulomb blockade region when the magnetizations in the ferromagnetic electrodes are antiparallel. Outside the squeezed Coulomb blockade region, we propose an anomalous region where the sequential tunneling in one of the spin bands is suppressed by the Coulomb blockade and that in the other is not. In this region, the tunnel magnetoresistance oscillates as a function of bias voltage. The temperature dependences of the tunnel magnetoresistance and the magnitude of the spin accumulation are calculated.

Original languageEnglish
Pages (from-to)6017-6020
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number9
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Spin-dependent coulomb blockade in ferromagnet/normal-metal/ferromagnet double tunnel junctions'. Together they form a unique fingerprint.

Cite this