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Magnetization switching in polycrystalline Mn3Sn thin film induced by self-generated spin-polarized current

Author

Listed:
  • Hang Xie

    (National University of Singapore)

  • Xin Chen

    (National University of Singapore)

  • Qi Zhang

    (National University of Singapore
    Southern University of Science and Technology, Xueyuan Rd. 1088)

  • Zhiqiang Mu

    (Chinese Academy of Sciences)

  • Xinhai Zhang

    (Southern University of Science and Technology, Xueyuan Rd. 1088)

  • Binghai Yan

    (Weizmann Institute of Science)

  • Yihong Wu

    (National University of Singapore)

Abstract

Electrical manipulation of spins is essential to design state-of-the-art spintronic devices and commonly relies on the spin current injected from a second heavy-metal material. The fact that chiral antiferromagnets produce spin current inspires us to explore the magnetization switching of chiral spins using self-generated spin torque. Here, we demonstrate the electric switching of noncollinear antiferromagnetic state in Mn3Sn by observing a crossover from conventional spin-orbit torque to the self-generated spin torque when increasing the MgO thickness in Ta/MgO/Mn3Sn polycrystalline films. The spin current injection from the Ta layer can be controlled and even blocked by varying the MgO thickness, but the switching sustains even at a large MgO thickness. Furthermore, the switching polarity reverses when the MgO thickness exceeds around 3 nm, which cannot be explained by the spin-orbit torque scenario due to spin current injection from the Ta layer. Evident current-induced switching is also observed in MgO/Mn3Sn and Ti/Mn3Sn bilayers, where external injection of spin Hall current to Mn3Sn is negligible. The inter-grain spin-transfer torque induced by spin-polarized current explains the experimental observations. Our findings provide an alternative pathway for electrical manipulation of non-collinear antiferromagnetic state without resorting to the conventional bilayer structure.

Suggested Citation

  • Hang Xie & Xin Chen & Qi Zhang & Zhiqiang Mu & Xinhai Zhang & Binghai Yan & Yihong Wu, 2022. "Magnetization switching in polycrystalline Mn3Sn thin film induced by self-generated spin-polarized current," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33345-2
    DOI: 10.1038/s41467-022-33345-2
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    1. Mingxing Wu & Taishi Chen & Takuya Nomoto & Yaroslav Tserkovnyak & Hironari Isshiki & Yoshinobu Nakatani & Tomoya Higo & Takahiro Tomita & Kouta Kondou & Ryotaro Arita & Satoru Nakatsuji & Yoshichika , 2024. "Current-driven fast magnetic octupole domain-wall motion in noncollinear antiferromagnets," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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