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Nonlinear Magnon Polaritons.

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Nonlinear spin-wave interactions suppress magnon polaritons in yttrium iron garnet films. High microwave powers cause gap closure in magnon-photon quasiparticles due to spin-wave backreaction.

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Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Magnonics

Background:

  • Magnon polaritons are hybrid quasiparticles formed by coupling magnons and photons.
  • Yttrium iron garnet (YIG) is a prominent material for studying magnonic phenomena due to its low damping.
  • Understanding nonlinear effects is crucial for controlling quantum phenomena in magnonic systems.

Purpose of the Study:

  • To investigate the impact of nonlinear spin-wave interactions on magnon polaritons.
  • To experimentally and theoretically demonstrate the suppression of magnon polaritons in YIG films.
  • To elucidate the mechanism behind the observed gap closure in microwave spectra.

Main Methods:

  • Experimental detection of magnon polaritons using an on-chip split-ring resonator.
  • Microwave spectroscopy to probe the coupling between Kittel and cavity modes.
  • Theoretical modeling incorporating three-magnon decay and spin-wave backreaction.

Main Results:

  • Observed strong coupling (avoided crossing) between Kittel and cavity modes at low microwave powers.
  • Demonstrated complete gap closure at high microwave powers, indicating suppression of magnon polaritons.
  • Experimental results were accurately explained by a theoretical model including nonlinear spin-wave interactions.

Conclusions:

  • Nonlinear spin-wave interactions, specifically three-magnon decay, are responsible for suppressing magnon polaritons.
  • The observed gap closure is attributed to the saturation of ferromagnetic resonance above the Suhl instability threshold.
  • This study provides insights into the fundamental physics of nonlinear magnonics and potential control mechanisms.