Tunnel magnetoresistance oscillations in current perpendicular to plane geometry of CoAlO granular thin films

K. Yakushiji, S. Mitani, K. Takanashi, H. Fujimori

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

We have fabricated current-perpendicular-to-plane geometry samples consisting of a thin CoAlO granular film sandwiched by top and bottom electrodes with a submicron-sized contact area, and measured magnetotransport properties at 4.2 K. Clear Coulomb staircases due to the charging effect of Co granules are observed by the addition of an Al-O bottleneck layer which leads to an asymmetric configuration of tunnel resistances. Furthermore, tunnel magnetoresistance (TMR) shows oscillatory behavior associated with the Coulomb staircase. It is considered that the TMR oscillation is based on the interplay of spin-dependent tunneling and single electron tunneling.

Original languageEnglish
Pages (from-to)7038-7040
Number of pages3
JournalJournal of Applied Physics
Volume91
Issue number10 I
DOIs
Publication statusPublished - 2002 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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