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Ultrafast magnetization enhancement via the dynamic spin-filter effect of type-II Weyl nodes in a kagome ferromagnet

Author

Listed:
  • Xianyang Lu

    (Nanjing University
    Nanjing University
    Nanjing University)

  • Zhiyong Lin

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Hanqi Pi

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Tan Zhang

    (University of Pennsylvania)

  • Guanqi Li

    (Guangdong University of Technology)

  • Yuting Gong

    (Nanjing University
    Nanjing University)

  • Yu Yan

    (Nanjing University
    Nanjing University)

  • Xuezhong Ruan

    (Nanjing University
    Nanjing University)

  • Yao Li

    (Nanjing University
    Nanjing University)

  • Hui Zhang

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Lin Li

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Liang He

    (Nanjing University
    Nanjing University)

  • Jing Wu

    (Guangdong University of Technology
    University of York)

  • Rong Zhang

    (Nanjing University)

  • Hongming Weng

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Changgan Zeng

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Yongbing Xu

    (Nanjing University
    Nanjing University
    Nanjing University
    University of York)

Abstract

The magnetic type-II Weyl semimetal (MWSM) Co3Sn2S2 has recently been found to host a variety of remarkable phenomena including surface Fermi-arcs, giant anomalous Hall effect, and negative flat band magnetism. However, the dynamic magnetic properties remain relatively unexplored. Here, we investigate the ultrafast spin dynamics of Co3Sn2S2 crystal using time-resolved magneto-optical Kerr effect and reflectivity spectroscopies. We observe a transient magnetization behavior, consisting of spin-flipping dominated fast demagnetization, slow demagnetization due to overall half-metallic electronic structures, and an unexpected ultrafast magnetization enhancement lasting hundreds of picoseconds upon femtosecond laser excitation. By combining temperature-, pump fluence-, and pump polarization-dependent measurements, we unambiguously demonstrate the correlation between the ultrafast magnetization enhancement and the Weyl nodes. Our theoretical modelling suggests that the excited electrons are spin-polarized when relaxing, leading to the enhanced spin-up density of states near the Fermi level and the consequently unusual magnetization enhancement. Our results reveal the unique role of the Weyl properties of Co3Sn2S2 in femtosecond laser-induced spin dynamics.

Suggested Citation

  • Xianyang Lu & Zhiyong Lin & Hanqi Pi & Tan Zhang & Guanqi Li & Yuting Gong & Yu Yan & Xuezhong Ruan & Yao Li & Hui Zhang & Lin Li & Liang He & Jing Wu & Rong Zhang & Hongming Weng & Changgan Zeng & Yo, 2024. "Ultrafast magnetization enhancement via the dynamic spin-filter effect of type-II Weyl nodes in a kagome ferromagnet," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46604-1
    DOI: 10.1038/s41467-024-46604-1
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