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, and Sebastian T. B. Goennenwein
Phys. Rev. B 92, 144411 – Published 9 October 2015

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.

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  • Received 3 March 2015
  • Revised 28 July 2015

DOI:https://doi.org/10.1103/PhysRevB.92.144411

©2015 American Physical Society

Authors & Affiliations

Michael Schreier1,2,*, Takahiro Chiba3, Arthur Niedermayr1,2, Johannes Lotze1,2, Hans Huebl1,4, Stephan Geprägs1, Saburo Takahashi3, Gerrit E. W. Bauer3,5,6, Rudolf Gross1,2,4, and Sebastian T. B. Goennenwein1,4

  • 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
  • 2Physik-Department, Technische Universität München, 85748 Garching, Germany
  • 3Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
  • 4Nanosystems Initiative Munich, 80799 Munich, Germany
  • 5WPI Advanced Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
  • 6Kavli Institute of NanoScience, Delft University of Technology, 2628 CJ Delft, The Netherlands

  • *michael.schreier@wmi.badw.de

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Issue

Vol. 92, Iss. 14 — 1 October 2015

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