Temperature-invariant magneto-optical Kerr effect in a noncollinear antiferromagnet
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918165769879552 |
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| author | Farhang, Camron Lu, Weihang Yao, Yuchuan Pal, Pratap Han, Shaofeng Zheng, Jian-Guo Chen, Hua Eom, Chang-Beom Xia, Jing |
| author_facet | Farhang, Camron Lu, Weihang Yao, Yuchuan Pal, Pratap Han, Shaofeng Zheng, Jian-Guo Chen, Hua Eom, Chang-Beom Xia, Jing |
| contents | The anomalous Hall effect and magneto-optical Kerr effect have traditionally been associated with ferromagnets, but recent studies reveal their presence in noncollinear antiferromagnets due to nonzero Berry curvature despite negligible net magnetization. However, Hall measurements often show strong temperature dependence caused by extrinsic scattering, complicating quantitative analysis, and temperature invariance of the Kerr effect remains unconfirmed. Here we employ epitaxial, stoichiometric Mn3NiN single crystal films and perform polar Kerr measurements at an infrared 1550 nm telecommunication wavelength, demonstrating a spontaneous Kerr signal that remains stable within a few percent across a 200 Kelvin range below the Néel temperature. This temperature-invariant Kerr effect contrasts with the strongly temperature-dependent Hall effect and confirms the intrinsic nature of Berry curvature in these materials. Our findings establish infrared Kerr effect as a reliable, local probe of Berry curvature in noncollinear antiferromagnets, facilitating quantitative characterization and advancing antiferromagnetic spintronic applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_19709 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Temperature-invariant magneto-optical Kerr effect in a noncollinear antiferromagnet Farhang, Camron Lu, Weihang Yao, Yuchuan Pal, Pratap Han, Shaofeng Zheng, Jian-Guo Chen, Hua Eom, Chang-Beom Xia, Jing Strongly Correlated Electrons Optics The anomalous Hall effect and magneto-optical Kerr effect have traditionally been associated with ferromagnets, but recent studies reveal their presence in noncollinear antiferromagnets due to nonzero Berry curvature despite negligible net magnetization. However, Hall measurements often show strong temperature dependence caused by extrinsic scattering, complicating quantitative analysis, and temperature invariance of the Kerr effect remains unconfirmed. Here we employ epitaxial, stoichiometric Mn3NiN single crystal films and perform polar Kerr measurements at an infrared 1550 nm telecommunication wavelength, demonstrating a spontaneous Kerr signal that remains stable within a few percent across a 200 Kelvin range below the Néel temperature. This temperature-invariant Kerr effect contrasts with the strongly temperature-dependent Hall effect and confirms the intrinsic nature of Berry curvature in these materials. Our findings establish infrared Kerr effect as a reliable, local probe of Berry curvature in noncollinear antiferromagnets, facilitating quantitative characterization and advancing antiferromagnetic spintronic applications. |
| title | Temperature-invariant magneto-optical Kerr effect in a noncollinear antiferromagnet |
| topic | Strongly Correlated Electrons Optics |
| url | https://arxiv.org/abs/2510.19709 |