Experimental Evidence of Néel-order-driven Magneto-optical Kerr Effect in an Altermagnetic Insulator
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866909974319333376 |
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| author | Pan, Haolin Xiao, Rui-Chun Han, Jiahao Zhu, Hongxing Li, Junxue Niu, Qian Gao, Yang Hou, Dazhi |
| author_facet | Pan, Haolin Xiao, Rui-Chun Han, Jiahao Zhu, Hongxing Li, Junxue Niu, Qian Gao, Yang Hou, Dazhi |
| contents | The magneto-optical Kerr effect (MOKE) is investigated in hematite, a collinear antiferromagnetic insulator, across a broad wavelength spectrum. By combining the optical measurements with magnetometry results, we unambiguously demonstrate that the Néel-order contribution dominates the MOKE signal, while contributions from net magnetization and external magnetic fields are negligible. This conclusion is quantitatively supported by first-principles calculations, and qualitatively by a symmetry analysis that the Néel contribution appears at the first order in spin-orbit coupling while the magnetization contribution starts only at the third order. This study clarifies the altermagnetic origin of the pronounced MOKE in hematite, underscoring the potential of altermagnets as a promising new class of magneto-optical materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_07149 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Experimental Evidence of Néel-order-driven Magneto-optical Kerr Effect in an Altermagnetic Insulator Pan, Haolin Xiao, Rui-Chun Han, Jiahao Zhu, Hongxing Li, Junxue Niu, Qian Gao, Yang Hou, Dazhi Other Condensed Matter The magneto-optical Kerr effect (MOKE) is investigated in hematite, a collinear antiferromagnetic insulator, across a broad wavelength spectrum. By combining the optical measurements with magnetometry results, we unambiguously demonstrate that the Néel-order contribution dominates the MOKE signal, while contributions from net magnetization and external magnetic fields are negligible. This conclusion is quantitatively supported by first-principles calculations, and qualitatively by a symmetry analysis that the Néel contribution appears at the first order in spin-orbit coupling while the magnetization contribution starts only at the third order. This study clarifies the altermagnetic origin of the pronounced MOKE in hematite, underscoring the potential of altermagnets as a promising new class of magneto-optical materials. |
| title | Experimental Evidence of Néel-order-driven Magneto-optical Kerr Effect in an Altermagnetic Insulator |
| topic | Other Condensed Matter |
| url | https://arxiv.org/abs/2512.07149 |