铁氧体薄圆盘静磁模的本征功率流密度涡旋
Eigen power-flow-density vortices of magnetostatic modes in thin ferrite disks
摘要：
在受限的磁有序结构中，可以观察到磁化涡旋和电磁功率流涡旋。存在拓扑上不同且健壮的状态。本文证明了在正常磁化的准二维铁氧体圆盘中存在磁偶极模振荡的本征功率流密度涡。由于这种循环功率流，振荡模式的特点是稳定的静磁能态和离散的波场的角动量。我们证明了微波谐振腔的电磁场可以激发出静磁模的功率流密度涡旋。从静磁波谱问题的解析解导出的铁氧体圆盘中的功率流密度涡旋结构与数值模拟电磁程序得到的功率流密度涡旋结构之间存在着明显的对应关系。
英文摘要：
In confined magnetically ordered structures one can observe vortices of magnetization and electromagnetic power flow vortices. There are topologically distinct and robust states. In this paper we show that in a normally magnetized quasi-2D ferrite disk there exist eigen power-flow-density vortices of magnetic-dipolar-mode oscillations. Because of such circular power flows, the oscillating modes are characterized by stable magnetostatic energy states and discrete angular moments of the wave fields. We show that the power-flow-density vortices of magnetostatic modes can be excited by electromagnetic fields of a microwave cavity. There is a clear correspondence between the power-flow-density vortex structures in a ferrite disk derived from an analytical solution of the magnetostatic-wave spectral problem and obtained by the numerical-simulation electromagnetic program.
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