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Electromotive force and huge magnetoresistance in magnetic tunnel junctions

Author

Listed:
  • Pham Nam Hai

    (The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan)

  • Shinobu Ohya

    (The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
    Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi-shi 332-0012, Japan)

  • Masaaki Tanaka

    (The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
    Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi-shi 332-0012, Japan)

  • Stewart E. Barnes

    (University of Miami, Coral Gables, Florida 33124, USA
    TCM, Cavendish Laboratory, University of Cambridge)

  • Sadamichi Maekawa

    (Institute for Materials Research, Tohoku University
    CREST, Japan Science and Technology Agency)

Abstract

Taking Faraday for a spin When an electron passes through a circuit, a force will act on the charge to increase the electron's energy. This is the electromotive force (e.m.f.), and according to Faraday's law of induction, an e.m.f. cannot be induced by a static magnetic field. But there are other forces present that will act on an electron's spin, giving rise to the possibility of generating an e.m.f. of purely spin origin, even in a static magnetic field. Pham Nam Hai and colleagues have now realized such an effect using magnetic tunnel junctions containing nanoscale magnetic particles. The resulting conversion of magnetic to electrical energy in these structures gives rise to a usefully large magnetoresistive response (as high as 100,000%), and might also form the basis of a 'spin battery'.

Suggested Citation

  • Pham Nam Hai & Shinobu Ohya & Masaaki Tanaka & Stewart E. Barnes & Sadamichi Maekawa, 2009. "Electromotive force and huge magnetoresistance in magnetic tunnel junctions," Nature, Nature, vol. 458(7237), pages 489-492, March.
    • Handle: RePEc:nat:nature:v:458:y:2009:i:7237:d:10.1038_nature07879
    DOI: 10.1038/nature07879
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    Cited by:

    1. Piotr Chabecki & Dariusz Całus & Fedir Ivashchyshyn & Anna Pidluzhna & Orest Hryhorchak & Ihor Bordun & Oleksandr Makarchuk & Andriy V. Kityk, 2020. "Functional Energy Accumulation, Photo- and Magnetosensitive Hybridity in the GaSe-Based Hierarchical Structures," Energies, MDPI, vol. 13(17), pages 1-16, August.

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