Enhanced Magnetoresistance in Insulating Granular Systems: Evidence for Higher-Order Tunneling

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

Research output: Contribution to journalArticlepeer-review

296 Citations (Scopus)

Abstract

We study the temperature and bias-voltage dependence of the magnetoresistance (MR) in insulating Co-Al-O granular films. The MR exhibits strong temperature dependence and is enhanced more than 20% at low temperatures, while it has no appreciable change in the bias-voltage dependence. The results provide clear evidence for the successive onset of higher-order processes of spin-dependent tunneling between large granules through intervening small ones with strong Coulomb blockade. The remarkable contrast between the temperature and bias-voltage dependence of the MR is consistently explained.

Original languageEnglish
Pages (from-to)2799-2802
Number of pages4
JournalPhysical Review Letters
Volume81
Issue number13
DOIs
Publication statusPublished - 1998 Sep 28

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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