Transmission of electrical signals by spin-wave interconversion in a magnetic insulator

Y. Kajiwara, K. Harii, S. Takahashi, J. Ohe, K. Uchida, M. Mizuguchi, H. Umezawa, H. Kawai, K. Ando, K. Takanashi, S. Maekawa and E. Saitoh ()
Additional contact information
Y. Kajiwara: Institute for Materials Research, Tohoku University
K. Harii: Institute for Materials Research, Tohoku University
S. Takahashi: Institute for Materials Research, Tohoku University
J. Ohe: Institute for Materials Research, Tohoku University
K. Uchida: Institute for Materials Research, Tohoku University
M. Mizuguchi: Institute for Materials Research, Tohoku University
H. Umezawa: FDK Corporation
H. Kawai: FDK Corporation
K. Ando: Institute for Materials Research, Tohoku University
K. Takanashi: Institute for Materials Research, Tohoku University
S. Maekawa: Institute for Materials Research, Tohoku University
E. Saitoh: Institute for Materials Research, Tohoku University

Nature, 2010, vol. 464, issue 7286, 262-266

Abstract: Spinning a message An insulator does not conduct electricity, and so cannot in general be used to transmit an electrical signal. However, the electrons within an insulator possess spin as well as charge, so it is possible for them to transmit a signal in the form of a spin wave. Kajiwara et al. have now developed a hybrid metal–insulator–metal structure in which an electrical signal in one metal layer is directly converted to a spin wave in the insulating layer. This wave is then transmitted to the second metal layer, where the signal can be directly recovered as an electrical voltage. The observation of voltage transmission in an insulator raises the prospect of insulator-based spintronics and other novel forms of signal delivery.

Date: 2010
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DOI: 10.1038/nature08876

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