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Dynamic self-organisation and pattern formation by magnon-polarons

Author

Listed:
  • M. Gidding

    (Radboud University
    Institute for Molecules and Materials)

  • T. Janssen

    (Radboud University
    Institute for Molecules and Materials)

  • C. S. Davies

    (Radboud University
    Institute for Molecules and Materials)

  • A. Kirilyuk

    (Radboud University
    Institute for Molecules and Materials)

Abstract

Magnetic materials play a vital role in energy-efficient data storage technologies, combining very fast switching with long-term retention of information. However, it has been shown that, at very short time scales, magnetisation dynamics become chaotic due to internal instabilities, resulting in incoherent spin-wave excitations that ultimately destroy magnetic ordering. Here, contrary to expectations, we show that such chaos gives rise to a periodic pattern of reversed magnetic domains, with a feature size far smaller than the spatial extent of the excitation. We explain this pattern as a result of phase-synchronisation of magnon-polaron quasiparticles, driven by strong coupling of magnetic and elastic modes. Our results reveal not only the peculiar formation and evolution of magnon-polarons at short time-scales, but also present an alternative mechanism of magnetisation reversal driven by coherent packets of short-wavelength magnetoelastic waves.

Suggested Citation

  • M. Gidding & T. Janssen & C. S. Davies & A. Kirilyuk, 2023. "Dynamic self-organisation and pattern formation by magnon-polarons," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37919-6
    DOI: 10.1038/s41467-023-37919-6
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    References listed on IDEAS

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    1. I. Tudosa & C. Stamm & A. B. Kashuba & F. King & H. C. Siegmann & J. Stöhr & G. Ju & B. Lu & D. Weller, 2004. "The ultimate speed of magnetic switching in granular recording media," Nature, Nature, vol. 428(6985), pages 831-833, April.
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