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Spin-torque skyrmion resonance in a frustrated magnet

Author

Listed:
  • Nirel Bernstein

    (The Hebrew University of Jerusalem)

  • Hang Li

    (Tiangong University
    Chinese Academy of Sciences)

  • Benjamin Assouline

    (The Hebrew University of Jerusalem)

  • Yong-Chang Lau

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Igor Rozhansky

    (The Hebrew University of Jerusalem
    University of Manchester)

  • Wenhong Wang

    (Tiangong University)

  • Amir Capua

    (The Hebrew University of Jerusalem)

Abstract

The frustrated Fe3Sn2 magnet is technologically attractive due to its extreme-temperature skyrmion stability, large topological Hall effect, and current-induced helicity switching attributed to a self-induced spin-torque. Here, we present a current-driven skyrmion resonance technique excited by self-induced spin-torque in Fe3Sn2. The dynamics are probed optically in a time-resolved measurement enabling us to distinguish between the excited modes. We find that only the breathing and rotational counterclockwise modes are excited, rather than the three modes typically observed in Dzyaloshinskii-Moriya interaction-dominated magnetic textures. When a DC current is passed through the crystal, the skyrmion resonance linewidth is modulated. Our micromagnetic simulations indicate that the linewidth broadening arises from an effective damping-like spin-orbit torque. Accordingly, we extract an effective spin Hall conductivity of $$\sim {{\bf{793}}}\,\pm {{\bf{176}}}\,\left({{\hslash }}/{{\boldsymbol{e}}}\right)\,{\left({{\bf{\Omega}}} \; {{\bf{cm}}}\right)}^{-{{\bf{1}}}}$$ ~ 793 ± 176 ℏ / e Ω cm − 1 . Complementary planar Hall measurements suggest a small yet finite contribution of the real-space spin texture in the electronic transport in addition to a primary $${{\boldsymbol{k}}}$$ k -space contribution. Our results bring new insights into the anisotropic nature of spin-torques in frustrated magnets and to the possibility of using the skyrmion resonance as a sensor for spin currents.

Suggested Citation

  • Nirel Bernstein & Hang Li & Benjamin Assouline & Yong-Chang Lau & Igor Rozhansky & Wenhong Wang & Amir Capua, 2025. "Spin-torque skyrmion resonance in a frustrated magnet," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59899-5
    DOI: 10.1038/s41467-025-59899-5
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    References listed on IDEAS

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