Enhanced tunnel magnetoresistance in granular nanobridges

K. Yakushiji, S. Mitani, K. Takanashi, S. Takahashi, S. Maekawa, H. Imamura, H. Fujimori

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

We have fabricated granular nanobridge structures consisting of electrodes separated by a nanometer-sized gap in which a thin insulating CoAlO granular film is filled, and measured the current-bias voltage characteristics in a magnetic field to investigate the spin-dependent transport. The Coulomb blockade with a clear threshold voltage (Vth) is observed at 4.2 K. Tunnel magnetoresistance (TMR) is enhanced by fabricating nanobridges. TMR shows a maximum exceeding about 30% at the voltage slightly above Vth. This enhancement is explained by the orthodox theory of single, electron tunneling in ferromagnetic multiple tunnel junctions.

Original languageEnglish
Pages (from-to)515-517
Number of pages3
JournalApplied Physics Letters
Volume78
Issue number4
DOIs
Publication statusPublished - 2001 Jan 22

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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