Nonlinear magnon polaritons

Abstract

We experimentally and theoretically demonstrate that nonlinear spin-wave interactions suppress the hybrid magnon-photon quasiparticle or "magnon polariton" in microwave spectra of an yttrium iron garnet film detected by an on-chip split-ring resonator. We observe a strong coupling between the Kittel and microwave cavity modes in terms of an avoided crossing as a function of magnetic fields at low microwave input powers, but a complete closing of the gap at high powers. The experimental results are well explained by a theoretical model including the three-magnon decay of the Kittel magnon into spin waves. The gap closure originates from the saturation of the ferromagnetic resonance above the Suhl instability threshold by a coherent back reaction from the spin waves.

6 pages

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Cited by in corpus (11)

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• Controlling magnon-photon coupling in a planar geometry
• Current-Controlled Magnon-Magnon Coupling in an On-Chip Cavity Resonator
• Dynamical phase-field model of cavity electromagnonic systems
• Magnon-magnon interaction induced by nonlinear spin wave dynamics
• Classical and quantum theory of magnonic and magnetoelastic nonlinear dynamics in continuum geometries
• Spin wave resonance in yttrium iron garnet stripe domains
• Loop-gap resonators achieving strong magnon-photon coupling in magnetic insulator thin films