Discovery of terahertz-frequency orbitally-coupled magnons in a kagome ferromagnet
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866917028391026688 |
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| author | Che, Mengqian Chen, Weizhao Wang, Maoyuan Bartram, F. Michael Liu, Liangyang Dong, Xuebin Liu, Jinjin Li, Yidian Lin, Hao Wang, Zhiwei Liu, Enke Yao, Yugui Yuan, Zhe Zhang, Guang-Ming Yang, Luyi |
| author_facet | Che, Mengqian Chen, Weizhao Wang, Maoyuan Bartram, F. Michael Liu, Liangyang Dong, Xuebin Liu, Jinjin Li, Yidian Lin, Hao Wang, Zhiwei Liu, Enke Yao, Yugui Yuan, Zhe Zhang, Guang-Ming Yang, Luyi |
| contents | 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 |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_09417 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Discovery of terahertz-frequency orbitally-coupled magnons in a kagome ferromagnet Che, Mengqian Chen, Weizhao Wang, Maoyuan Bartram, F. Michael Liu, Liangyang Dong, Xuebin Liu, Jinjin Li, Yidian Lin, Hao Wang, Zhiwei Liu, Enke Yao, Yugui Yuan, Zhe Zhang, Guang-Ming Yang, Luyi Strongly Correlated Electrons 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 |
| title | Discovery of terahertz-frequency orbitally-coupled magnons in a kagome ferromagnet |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.09417 |