近日，中国科学院半导体研究所半导体超晶格国家重点实验室的王开友及其研究小组与中山大学深圳校区的张佳茜合作并取得一项新进展。经过不懈努力，他们揭示范德华室温铁磁铁Fe₃GaTe₂中的巨磁光效应。相关研究成果已于2024年6月20日在国际知名学术期刊《中国物理快报》上发表。

本文报道了通过自通量法合成的固有vdWs铁磁晶体Fe₃GaTe₂，其居里温度(T_C)为370K，饱和磁化强度为33.47emu/g, PMA能量密度约为4.17×10⁵J/m³。此外，他们系统地研究了Fe₃GaTe₂的磁光效应。双简并E_2g(Γ)模式反转了入射光子的螺旋度，表明存在伪角动量(PAM)和手性。同时，非简并非手性A_1g(Γ)声子在面外磁场作用下表现出显著的磁拉曼效应。这些结果为研究二维磁性材料中的声子手性和磁光现象奠定了基础，为进一步在自旋电子器件中的基础研究和应用提供了可行性。

据悉，铁磁二维(2D)范德华(vdWs)材料的发现为探索有趣的物理学和开发创新的自旋电子器件提供了机会。然而，vdWs铁磁晶体的实际应用面临的主要挑战是其本征铁磁性较弱，室温以上垂直磁各向异性(PMA)较小。

附：英文原文

Title: Giant Magneto-Optical Effect in van der Waals Room-Temperature Ferromagnet Fe₃GaTe₂

Author: Xiaomin Zhang^1,2, Jian Wang^1,2, Wenkai Zhu¹, Jiaqian Zhang³, Weihao Li^1,2, Jing Zhang^1,2*, and Kaiyou Wang^1,2*

Issue&Volume: 2024-06-20

Abstract: The discovery of ferromagnetic two-dimensional (2D) van der Waals (vdWs) materials provides an opportunity to explore intriguing physics and to develop innovative spin electronic devices. However, the main challenge for practical applications of vdWs ferromagnetic crystals lies in the weak intrinsic ferromagnetism and small perpendicular magnetic anisotropy (PMA) above room temperature. Here, we report the intrinsic vdWs ferromagnetic crystal Fe₃GaTe₂, synthesized by the self-flux method, exhibiting a Curie temperature (T_C) of 370K, a high saturation magnetization of 33.47emu/g, and a large PMA energy density of approximately 4.17×10⁵J/m³. Furthermore, the magneto-optical effect is systematically investigated in Fe₃GaTe₂. The doubly degenerate E_2g(Γ) mode reverses the helicity of incident photons, indicating the existence of pseudoangular-momentum (PAM) and chirality. Meanwhile, the non-degenerate non-chiral A_1g(Γ) phonon exhibits a significant magneto-Raman effect under an external out-of-plane magnetic field. These results lay the groundwork for studying phonon chirality and magneto-optical phenomena in 2D magnetic materials, providing the feasibility for further fundamental research and applications in spintronic devices.

DOI: 10.1088/0256-307X/41/6/067503

Source: https://cpl.iphy.ac.cn/10.1088/0256-307X/41/6/067503