Tunnel-MR and spin electronics in metal-nonmetal granular systems

S. Mitani, H. Fujimori, K. Takanashi, K. Yakushiji, J. G. Ha, S. Takahashi, S. Maekawa, S. Ohnuma, N. Kobayashi, T. Masumoto, M. Ohnuma, K. Hono

Research output: Contribution to journalConference articlepeer-review

66 Citations (Scopus)

Abstract

Recent advances in the researches of tunnel-magnetoresistance (tunnel-MR) in metal-nonmetal granular systems are overviewed, showing mainly our results on Co-Al-O films. Electron microscopy observations revealed that sputter-deposited Co-Al-O films possess well-defined metal-nonmetal granular structures with Co granules of 2-3 nm in diameter. Anomalous temperature and bias-voltage dependence of MR was found in Co-Al-O granular films, and was explained by a theory of spin-dependent higher-order tunneling. Magnetic field sensitivity of tunnel-MR in metal-nonmetal granular systems was dramatically improved by means of granular-in-gap (GIG) structures. Perspectives for the future application are also discussed with GIGs.

Original languageEnglish
Pages (from-to)179-184
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume198
DOIs
Publication statusPublished - 1999 Jun 1
EventProceedings of the 1998 3rd International Symposium on Metallic Multilayers (MML-98) - Vancouver, BC, Can
Duration: 1998 Jun 141998 Jun 19

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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