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Dynamic self-organisation and pattern formation by magnon-polarons
M Gidding1,2, T Janssen1,2, C S Davies3,4
1FELIX Laboratory, Radboud University, Toernooiveld 7, 6525 ED, Nijmegen, The Netherlands.
Nature Communications
|April 18, 2023
Summary
Chaos in magnetic materials unexpectedly creates periodic reversed magnetic domains. This phenomenon arises from phase-synchronised magnon-polarons, offering a new magnetisation reversal mechanism via magnetoelastic waves.
Area of Science:
- Physics
- Materials Science
- Condensed Matter Physics
Background:
- Magnetic materials are crucial for energy-efficient data storage, offering fast switching and data retention.
- Short timescales in magnetisation dynamics can lead to chaotic behavior and loss of magnetic ordering due to instabilities.
- Spin-wave excitations can become incoherent, disrupting magnetic properties.
Purpose of the Study:
- To investigate the unexpected formation of ordered patterns from chaotic magnetisation dynamics.
- To explore the underlying mechanisms of magnetisation reversal at very short timescales.
- To understand the role of magnon-polaron quasiparticles and magnetoelastic coupling.
Main Methods:
- Analysis of magnetisation dynamics at very short timescales.
- Investigating the formation of periodic patterns in reversed magnetic domains.
- Theoretical explanation involving phase-synchronisation of magnon-polarons.
- Studying the coupling between magnetic and elastic modes.
Main Results:
- Chaotic magnetisation dynamics unexpectedly produce periodic patterns of reversed magnetic domains.
- The feature size of these domains is significantly smaller than the excitation extent.
- Phase-synchronisation of magnon-polarons, driven by magnetoelastic coupling, explains the observed pattern.
- Evidence of magnon-polaron formation and evolution at short timescales was found.
Conclusions:
- Chaos in magnetic systems can lead to ordered structures, contrary to previous expectations.
- Magnon-polarons and their phase-synchronisation offer a novel mechanism for magnetisation reversal.
- Short-wavelength magnetoelastic waves can drive coherent magnetisation reversal.
- The study reveals new insights into short-timescale magnetisation dynamics and magnetic ordering.
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