Dynamic self-organisation and pattern formation by magnon-polarons

M. Gidding, T. Janssen, C. S. Davies () and A. Kirilyuk ()
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M. Gidding: Radboud University
T. Janssen: Radboud University
C. S. Davies: Radboud University
A. Kirilyuk: Radboud University

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-37919-6

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