Tunable magnon-photon coupling in a compensating ferrimagnet—from weak to strong coupling
Tunable magnon-photon coupling in a compensating ferrimagnet—from weak to strong coupling
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DOI：
10.1063/1.4979409
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发表时间：
2017-01
影响因子：
4
通讯作者：
H. Maier-Flaig;M. Harder;S. Klingler;Z. Qiu;E. Saitoh;M. Weiler;S. Geprags;R. Gross;S. Goennenwein;H. Huebl
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文献类型：
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作者：
H. Maier-Flaig;M. Harder;S. Klingler;Z. Qiu;E. Saitoh;M. Weiler;S. Geprags;R. Gross;S. Goennenwein;H. Huebl
实验研究了由补偿铁磁钆铁石榴石（GdIG）和三维微波腔组成的系统中的磁振子-光子耦合。改变温度以调谐GdIG磁化并观察从弱耦合状态到强耦合状态的转变。通过测量和模拟系统的复反射参数，提取了样品的有效耦合率geff和磁化强度Meff。比较geff与磁振子和腔衰减率，我们得出结论，强耦合制度是很容易使用GdIG。我们表明，有效的耦合强度如下预测的平方根依赖于磁化强度。
We experimentally study the magnon-photon coupling in a system consisting of a compensating ferrimagnet gadolinium iron garnet (GdIG) and a three-dimensional microwave cavity. The temperature is varied in order to tune the GdIG magnetization and to observe the transition from the weak coupling regime to the strong coupling regime. By measuring and modelling the complex reflection parameter of the system, the effective coupling rate geff and the magnetization Meff of the sample are extracted. Comparing geff with the magnon and the cavity decay rate, we conclude that the strong coupling regime is easily accessible using GdIG. We show that the effective coupling strength follows the predicted square root dependence on the magnetization.