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Efficient spin excitation via ultrafast damping-like torques in antiferromagnets

Author

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  • Christian Tzschaschel

    (ETH Zurich
    Harvard University)

  • Takuya Satoh

    (Tokyo Institute of Technology)

  • Manfred Fiebig

    (ETH Zurich)

Abstract

Damping effects form the core of many emerging concepts for high-speed spintronic applications. Important characteristics such as device switching times and magnetic domain-wall velocities depend critically on the damping rate. While the implications of spin damping for relaxation processes are intensively studied, damping effects during impulsive spin excitations are assumed to be negligible because of the shortness of the excitation process. Herein we show that, unlike in ferromagnets, ultrafast damping plays a crucial role in antiferromagnets because of their strongly elliptical spin precession. In time-resolved measurements, we find that ultrafast damping results in an immediate spin canting along the short precession axis. The interplay between antiferromagnetic exchange and magnetic anisotropy amplifies this canting by several orders of magnitude towards large-amplitude modulations of the antiferromagnetic order parameter. This leverage effect discloses a highly efficient route towards the ultrafast manipulation of magnetism in antiferromagnetic spintronics.

Suggested Citation

  • Christian Tzschaschel & Takuya Satoh & Manfred Fiebig, 2020. "Efficient spin excitation via ultrafast damping-like torques in antiferromagnets," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19749-y
    DOI: 10.1038/s41467-020-19749-y
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    Cited by:

    1. Y. Behovits & A. L. Chekhov & S. Yu. Bodnar & O. Gueckstock & S. Reimers & Y. Lytvynenko & Y. Skourski & M. Wolf & T. S. Seifert & O. Gomonay & M. Kläui & M. Jourdan & T. Kampfrath, 2023. "Terahertz Néel spin-orbit torques drive nonlinear magnon dynamics in antiferromagnetic Mn2Au," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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