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arXiv · 2201.10889

Nonlinear magnon polaritons

Oscar Lee·Kei Yamamoto·Maki Umeda·Christoph W. Zollitsch·Mehrdad Elyasi·Takashi Kikkawa·Eiji Saitoh·Gerrit E. W. Bauer·Hidekazu Kurebayashi
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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.

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Oscar Lee, Kei Yamamoto, Maki Umeda, Christoph W. Zollitsch, Mehrdad Elyasi, Takashi Kikkawa, Eiji Saitoh, Gerrit E. W. Bauer, Hidekazu Kurebayashi. 2022-09-21. Nonlinear magnon polaritons. https://doi.org/10.1103/physrevlett.130.046703

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