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Unidirectional spin-Hall and Rashba−Edelstein magnetoresistance in topological insulator-ferromagnet layer heterostructures

Author

Listed:
  • Yang Lv

    (University of Minnesota)

  • James Kally

    (The Pennsylvania State University)

  • Delin Zhang

    (University of Minnesota)

  • Joon Sue Lee

    (The Pennsylvania State University)

  • Mahdi Jamali

    (University of Minnesota)

  • Nitin Samarth

    (The Pennsylvania State University)

  • Jian-Ping Wang

    (University of Minnesota)

Abstract

The large spin−orbit coupling in topological insulators results in helical spin-textured Dirac surface states that are attractive for topological spintronics. These states generate an efficient spin−orbit torque on proximal magnetic moments. However, memory or logic spin devices based upon such switching require a non-optimal three-terminal geometry, with two terminals for the writing current and one for reading the state of the device. An alternative two-terminal device geometry is now possible by exploiting the recent discovery of the unidirectional spin Hall magnetoresistance in heavy metal/ferromagnet bilayers and unidirectional magnetoresistance in magnetic topological insulators. Here, we report the observation of such unidirectional magnetoresistance in a technologically relevant device geometry that combines a topological insulator with a conventional ferromagnetic metal. Our devices show a figure of merit (magnetoresistance per current density per total resistance) that is more than twice as large as the highest reported values in all-metal Ta/Co bilayers.

Suggested Citation

  • Yang Lv & James Kally & Delin Zhang & Joon Sue Lee & Mahdi Jamali & Nitin Samarth & Jian-Ping Wang, 2018. "Unidirectional spin-Hall and Rashba−Edelstein magnetoresistance in topological insulator-ferromagnet layer heterostructures," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-017-02491-3
    DOI: 10.1038/s41467-017-02491-3
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    Cited by:

    1. Zhaowei Zhang & Naizhou Wang & Ning Cao & Aifeng Wang & Xiaoyuan Zhou & Kenji Watanabe & Takashi Taniguchi & Binghai Yan & Wei-bo Gao, 2022. "Controlled large non-reciprocal charge transport in an intrinsic magnetic topological insulator MnBi2Te4," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    2. Qi Zhang & Kun Tao & Chenglong Jia & Guofu Xu & Guozhi Chai & Yalu Zuo & Baoshan Cui & Dezheng Yang & Desheng Xue & Li Xi, 2024. "Large unidirectional spin Hall magnetoresistance in FeNi/Pt/Bi2Se3 trilayers by Pt interfacial engineering," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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