This review discusses the ultrafast magnetization dynamics within the gigahertz to terahertz frequency range in ferrimagnetic rare-earth iron garnets with different substitutions. In these garnets, the roles of spin–orbit and exchange interactions have been detected using femtosecond laser pulses via the inverse Faraday effect. The all-optical control of spin-wave and Kaplan–Kittel exchange resonance modes in different frequency ranges is shown. Generation and localization of the electric field distribution inside the garnet through the metal-bound surface plasmon-polariton strongly enhance the amplitude of the exchange resonance modes. The exchange resonance mode in yttrium iron garnets was observed using circularly polarized Raman spectroscopy. The results of this study may be utilized in the development of a wide class of optomagnonic devices in the gigahertz to terahertz frequency range.

中文翻译：

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亚铁磁多子晶格石榴石中的超快光磁学

本综述讨论了具有不同取代基的亚铁磁性稀土铁石榴石在千兆赫到太赫兹频率范围内的超快磁化动力学。在这些石榴石中，使用飞秒激光脉冲通过反法拉第效应检测到自旋轨道和交换相互作用的作用。显示了不同频率范围内自旋波和 Kaplan-Kittel 交换共振模式的全光控制。通过金属结合表面等离子体激元在石榴石内部产生和定位电场分布，强烈增强了交换共振模式的振幅。使用圆偏振拉曼光谱观察了钇铁石榴石中的交换共振模式。