Current-induced spin torque resonance of a magnetic insulator

Michael Schreier, Takahiro Chiba, Arthur Niedermayr, Johannes Lotze, Hans Huebl, Stephan Geprägs, Saburo Takahashi, Gerrit E.W. Bauer, Rudolf Gross, Sebastian T.B. Goennenwein

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Abstract

We report the observation of current-induced spin torque resonance in yttrium iron garnet/platinum bilayers. An alternating charge current at GHz frequencies in the platinum gives rise to dc spin pumping and spin Hall magnetoresistance rectification voltages, induced by the Oersted fields of the ac current and the spin Hall effect-mediated spin transfer torque. In ultrathin yttrium iron garnet films, we observe spin transfer torque actuated magnetization dynamics which are significantly larger than those generated by the ac Oersted field. Spin transfer torques thus efficiently couple charge currents and magnetization dynamics also in magnetic insulators, enabling charge current-based interfacing of magnetic insulators with microwave devices.

Original languageEnglish
Article number144411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number14
DOIs
Publication statusPublished - 2015 Oct 9

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Schreier, M., Chiba, T., Niedermayr, A., Lotze, J., Huebl, H., Geprägs, S., Takahashi, S., Bauer, G. E. W., Gross, R., & Goennenwein, S. T. B. (2015). Current-induced spin torque resonance of a magnetic insulator. Physical Review B - Condensed Matter and Materials Physics, 92(14), [144411]. https://doi.org/10.1103/PhysRevB.92.144411