在kagome铁磁体中发现太赫兹频率轨道耦合磁振子
Discovery of terahertz-frequency orbitally-coupled magnons in a kagome ferromagnet
AI总结：
本研究利用时间分辨Kerr旋转光谱在拓扑kagome铁磁体Co3Sn2S2中发现6 K下0.61和0.49 THz的轨道耦合磁振子共振，揭示自旋—轨道强耦合机制及其太赫兹自旋电子应用潜力。
摘要：
在铁磁材料中，磁振子——即自旋波的量子——通常在吉赫兹范围内共振。除常规磁振子外，尽管理论研究已经预测了与轨道磁矩相关的磁振子，但其直接观测仍然具有挑战性。在此，我们报告在拓扑kagome铁磁体Co3Sn2S2中发现两个不同的太赫兹轨道耦合磁振子共振。利用时间分辨Kerr旋转光谱，我们在6 K下精确定位了位于0.61和0.49 THz的两个磁振子共振；由于强磁晶各向异性，它们超过了此前报道的所有铁磁体磁振子共振。这两种模式源于局域自旋磁矩与轨道磁矩之间的强耦合。这些发现揭示了一类源于轨道磁矩的新型磁振子，并使Co3Sn2S2成为高速太赫兹自旋电子应用的有前景候选材料。
英文摘要：
In ferromagnetic materials, magnons - quanta of spin waves - typically resonate in the gigahertz range. Beyond conventional magnons, while theoretical studies have predicted magnons associated with orbital magnetic moments, their direct observation has remained challenging. Here, we present the discovery of two distinct terahertz orbitally-coupled magnon resonances in the topological kagome ferromagnet Co3Sn2S2. Using time-resolved Kerr rotation spectroscopy, we pinpoint two magnon resonances at 0.61 and 0.49 THz at 6 K, surpassing all previously reported magnon resonances in ferromagnets due to strong magnetocrystalline anisotropy. These dual modes originate from the strong coupling of localized spin and orbital magnetic moments. These findings unveil a novel category of magnons stemming from orbital magnetic moments, and position Co3Sn2S2 as a promising candidate for high-speed terahertz spintronic applications
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