Nonlinear Magnon Polaritons
Nonlinear Magnon Polaritons
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DOI：
10.1103/physrevlett.130.046703
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发表时间：
2023-01-26
影响因子：
8.6
通讯作者：
Kurebayashi, Hidekazu
中科院分区：
文献类型：
--
作者：
Lee, Oscar;Yamamoto, Kei;Kurebayashi, Hidekazu
我们从实验和理论上证明了非线性自旋波相互作用抑制了由片上开口环谐振器探测的钇铁石榴石薄膜微波谱中的混合磁振子-光子准粒子或“磁振子极化激元”。我们观察到的Kittel和微波腔模式之间的强耦合在避免交叉作为磁场的函数在低微波输入功率，但在高功率的差距完全关闭。实验结果很好地解释了一个理论模型，包括三个磁振子衰变到自旋波的Kittel磁振子。差距闭合起源于自旋波的相干反作用导致的高于苏尔不稳定性阈值的铁磁共振饱和。
We experimentally and theoretically demonstrate that nonlinear spin-wave interactions suppress the hybrid magnon-photon quasiparticle or "magnon polariton" in microwave spectra of a 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 backreaction from the spin waves.