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Spin–torque generator engineered by natural oxidation of Cu

Author

Listed:
  • Hongyu An

    (Keio University)

  • Yuito Kageyama

    (Keio University)

  • Yusuke Kanno

    (Keio University)

  • Nagisa Enishi

    (Keio University)

  • Kazuya Ando

    (Keio University
    PRESTO, Japan Science and Technology Agency)

Abstract

The spin Hall effect is a spin–orbit coupling phenomenon, which enables electric generation and detection of spin currents. This relativistic effect provides a way for realizing efficient spintronic devices based on electric manipulation of magnetization through spin torque. However, it has been believed that heavy metals are indispensable for the spin–torque generation. Here we show that the spin Hall effect in Cu, a light metal with weak spin–orbit coupling, is significantly enhanced through natural oxidation. We demonstrate that the spin–torque generation efficiency of a Cu/Ni81Fe19 bilayer is enhanced by over two orders of magnitude by tuning the surface oxidation, reaching the efficiency of Pt/ferromagnetic metal bilayers. This finding illustrates a crucial role of oxidation in the spin Hall effect, opening a route for engineering the spin–torque generator by oxygen control and manipulating magnetization without using heavy metals.

Suggested Citation

  • Hongyu An & Yuito Kageyama & Yusuke Kanno & Nagisa Enishi & Kazuya Ando, 2016. "Spin–torque generator engineered by natural oxidation of Cu," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13069
    DOI: 10.1038/ncomms13069
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    Cited by:

    1. Yunfeng You & Hua Bai & Xiaoyu Feng & Xiaolong Fan & Lei Han & Xiaofeng Zhou & Yongjian Zhou & Ruiqi Zhang & Tongjin Chen & Feng Pan & Cheng Song, 2021. "Cluster magnetic octupole induced out-of-plane spin polarization in antiperovskite antiferromagnet," Nature Communications, Nature, vol. 12(1), pages 1-8, December.

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