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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.