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Journal of Synthetic Crystals ›› 2026, Vol. 55 ›› Issue (9): 1344-1356.DOI: 10.16553/j.cnki.issn1000-985x.2026.0122

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Research Progress on Novel Topological Magneto-Optical Materials

WANG Shenglin, SHEN Hui(), RAN Yiming, CHEN Zhenghong, XU Jiayue   

  1. Faculty of Materials Technology,Shanghai Institute of Technology,Shanghai 201418,China
  • Received:2026-06-25 Online:2026-09-20 Published:2026-09-29
  • Contact: SHEN Hui

Abstract: Magneto-optical crystals enable unidirectional laser transmission and are widely used in nonreciprocal optical devices, including optical isolators, optical switches, playing an irreplaceable role in optical communications and high-power lasers. At present, conventional magneto-optical materials such as TGG, CeF3, and YIG have been extensively applied in the ultraviolet, visible, and near-infrared spectral ranges. However, rather limited types of magneto-optical materials fulfill the increasing potential demands for the mid-infrared and even Terahertz ranges. Recently, hexagonal non-collinear antiferromagnets Mn3Sn, featuring unique kagome structure and topological band, have been continuously reported in journals such as Nature. Despite its extremely small net magnetic moments, Mn3Sn exhibits giant magneto-optical Kerr effects and anomalous Hall effects, showing great potential for mid-infrared and terahertz applications. This paper systematically reviews the recent research progress on Mn3Sn crystals, including their magneto-optical properties, relevant modulation mechanisms, and crystal growth, aiming to provide valuable references for the design of novel magneto-optical materials.

Key words: magneto-optical material; topological band structure; mid-infrared waveband; Mn3Sn; non-collinear antiferromagnet

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