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Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films

Author

Listed:
  • Qiming Shao

    (University of California)

  • Chi Tang

    (University of California)

  • Guoqiang Yu

    (University of California
    Chinese Academy of Sciences)

  • Aryan Navabi

    (University of California)

  • Hao Wu

    (Chinese Academy of Sciences)

  • Congli He

    (University of California)

  • Junxue Li

    (University of California)

  • Pramey Upadhyaya

    (University of California)

  • Peng Zhang

    (University of California)

  • Seyed Armin Razavi

    (University of California)

  • Qing Lin He

    (University of California)

  • Yawen Liu

    (University of California)

  • Pei Yang

    (University of California
    Nanjing University)

  • Se Kwon Kim

    (University of California)

  • Cheng Zheng

    (University of California)

  • Yizhou Liu

    (University of California)

  • Lei Pan

    (University of California)

  • Roger K. Lake

    (University of California)

  • Xiufeng Han

    (Chinese Academy of Sciences)

  • Yaroslav Tserkovnyak

    (University of California)

  • Jing Shi

    (University of California)

  • Kang L. Wang

    (University of California
    University of California)

Abstract

Magnetic insulators (MIs) attract tremendous interest for spintronic applications due to low Gilbert damping and the absence of Ohmic loss. Spin-orbit torques (SOTs) on MIs are more intriguing than magnetic metals since SOTs cannot be transferred to MIs through direct injection of electron spins. Understanding of SOTs on MIs remains elusive, especially how SOTs scale with the MI film thickness. Here, we observe the critical role of dimensionality on the SOT efficiency by studying the MI layer thickness-dependent SOT efficiency in tungsten/thulium iron garnet (W/TmIG) bilayers. We show that the TmIG thin film evolves from two-dimensional to three-dimensional magnetic phase transitions as the thickness increases. We report the significant enhancement of the measured SOT efficiency as the TmIG thickness increases, which is attributed to the increase of the magnetic moment density. We demonstrate the current-induced SOT switching in the W/TmIG bilayers with a TmIG thickness up to 15 nm.

Suggested Citation

  • Qiming Shao & Chi Tang & Guoqiang Yu & Aryan Navabi & Hao Wu & Congli He & Junxue Li & Pramey Upadhyaya & Peng Zhang & Seyed Armin Razavi & Qing Lin He & Yawen Liu & Pei Yang & Se Kwon Kim & Cheng Zhe, 2018. "Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-06059-7
    DOI: 10.1038/s41467-018-06059-7
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