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中国物理学会期刊

微波谐振腔中磁双层的零阻尼效应

CSTR: 32037.14.aps.74.20241730

Zero damping effect of magnetic bilayer in microwave resonant cavity

CSTR: 32037.14.aps.74.20241730
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  • 实验和理论研究表明单个磁子模式与谐振腔光子能够形成相干型与耗散型耦合, 这两个耦合通道的干涉会产生零阻尼效应. 本工作将零阻尼效应拓展到两个磁子模式, 研究了微波谐振腔中磁双层的零阻尼效应. 基于本征频率和微波透射谱, 推导了两个磁子模式的零阻尼产生条件以及频率失谐的表达式, 并与数值计算的微波透射谱进行比较, 获得了零阻尼与系统参数之间的关系. 此外, 本文也分析了磁双层中界面交换耦合引起的磁子-磁子直接耦合带来的影响. 由于零阻尼对应的微波透射谱的线宽非常窄, 因而本工作对于设计基于磁子零阻尼效应的量子传感器件具有重要意义.

     

    Experimental and theoretical studies have shown that a single magnon mode and cavity photon can be coupled coherently and dissipatively, with the interference between two types of coupling creating zero damping effect. In magnetic bilayers or multilayers, there exists more than one magnon mode which can be directly coupled by interface exchange interaction. In this work, a single-magnon mode is extended to a two-magnon mode and the effect of the two-magnon mode on zero damping condition is investigated. Using eigenfrequency analysis and microwave transmission spectra, the analytical expressions of the zero damping condition and the frequency detuning can be derived. By comparing analytical results with numerical results, the dependence of zero damping condition on system parameters can be obtained. In the absence of direct interface exchange magnon-magnon coupling, the zero damping condition occurs for dissipative coupling or hybrid coupling. As the coupling strength increases, the distance between two zero damping points increases. For hybrid coupling, the two zero damping points turn no longer symmetric, which is different from the case of pure coupling. Moreover, the effect of interface exchange magnon-magnon interaction on zero damping condition is studied. The interface exchange coupling results in the splitting of microwave transmission spectra, but the zero damping condition occurs only in the low-frequency mode. As the interface exchange coupling strength increases, the frequency at which the zero damping condition happens will shift toward lower frequency. Due to extremely narrow line-width of microwave transmission dip under the zero damping condition, the result in this work is expected to be useful for designing the magnon-based quantum sensing devices.

     

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