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Origin of the light-induced spin currents in heavy metal/magnetic insulator bilayers

Author

Listed:
  • Hongru Wang

    (East China Normal University)

  • Jing Meng

    (East China Normal University)

  • Jianjun Lin

    (East China Normal University)

  • Bin Xu

    (East China Normal University)

  • Hai Ma

    (East China Normal University)

  • Yucheng Kan

    (East China Normal University)

  • Rui Chen

    (East China Normal University)

  • Lujun Huang

    (East China Normal University)

  • Ye Chen

    (East China Normal University)

  • Fangyu Yue

    (East China Normal University)

  • Chun-Gang Duan

    (East China Normal University)

  • Junhao Chu

    (East China Normal University
    Fudan University)

  • Lin Sun

    (East China Normal University)

Abstract

Light-induced spin currents with the faster response is essential for the more efficient information transmission and processing. Herein, we systematically explore the effect of light illumination energy and direction on the light-induced spin currents in the W/Y3Fe5O12 heterojunction. Light-induced spin currents can be clearly categorized into two types. One is excited by the low light intensity, which mainly involves the photo-generated spin current from spin photovoltaic effect. The other is caused by the high light intensity, which is the light-thermally induced spin current and mainly excited by spin Seebeck effect. Under low light-intensity illumination, light-thermally induced temperature gradient is very small so that spin Seebeck effect can be neglected. Furthermore, the mechanism on spin photovoltaic effect is fully elucidated, where the photo-generated spin current in Y3Fe5O12 mainly originates from the process of spin precession induced by photons. These findings provide some deep insights into the origin of light-induced spin current.

Suggested Citation

  • Hongru Wang & Jing Meng & Jianjun Lin & Bin Xu & Hai Ma & Yucheng Kan & Rui Chen & Lujun Huang & Ye Chen & Fangyu Yue & Chun-Gang Duan & Junhao Chu & Lin Sun, 2024. "Origin of the light-induced spin currents in heavy metal/magnetic insulator bilayers," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48710-6
    DOI: 10.1038/s41467-024-48710-6
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