Excitation of Whispering Gallery Magnons in a Magnetic Vortex
Excitation of Whispering Gallery Magnons in a Magnetic Vortex
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DOI：
10.1103/physrevlett.122.097202
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发表时间：
2019-03-05
影响因子：
8.6
通讯作者：
Schultheiss, H.
中科院分区：
文献类型：
--
作者：
Schultheiss, K.;Verba, R.;Schultheiss, H.
我们提出了一个μ m大小的磁性Ni_（81）Fe_（19）盘在涡旋态下通过非线性3-磁振子散射产生具有前所未有的高波矢的回音壁磁振子。这些模式表现出很强的本地化在周边的磁盘和实际上零振幅的扩展区域周围的涡核。它们起源于基本径向磁振子模的分裂，这种磁振子模可以在涡旋织构中被面外微波场共振激发。我们从实验和理论的角度阐明了这种非线性散射机制的基本原理。利用布里渊光散射显微镜，我们研究了3-磁振子分裂的频率和功率依赖性。空间分辨的模式配置文件提供证据的本地化的边界处的光盘，并允许直接确定的模式波数。
We present the generation of whispering gallery magnons with unprecedented high wave vectors via nonlinear 3-magnon scattering in a mu m-sized magnetic Ni81Fe19 disc which is in the vortex state. These modes exhibit a strong localization at the perimeter of the disc and practically zero amplitude in an extended area around the vortex core. They originate from the splitting of the fundamental radial magnon modes, which can be resonantly excited in a vortex texture by an out-of-plane microwave field. We shed light on the basics of this nonlinear scattering mechanism from an experimental and theoretical point of view. Using Brillouin light scattering microscopy, we investigated the frequency and power dependence of the 3-magnon splitting. The spatially resolved mode profiles give evidence for the localization at the boundaries of the disc and allow for a direct determination of the modes wave number.