Electromotive force and huge magnetoresistance in magnetic tunnel junctions

Pham Nam Hai, Shinobu Ohya, Masaaki Tanaka (), Stewart E. Barnes and Sadamichi Maekawa
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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
Masaaki Tanaka: The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Stewart E. Barnes: University of Miami, Coral Gables, Florida 33124, USA
Sadamichi Maekawa: Institute for Materials Research, Tohoku University

Nature, 2009, vol. 458, issue 7237, 489-492

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'.

Date: 2009
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DOI: 10.1038/nature07879

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