| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Giant Magneto-Optical Effect in van der Waals Room-Temperature Ferromagnet Fe$_{3}$GaTe$_{2}$ |
| Xiaomin Zhang1,2, Jian Wang1,2, Wenkai Zhu1, Jiaqian Zhang3, Weihao Li1,2, Jing Zhang1,2*, and Kaiyou Wang1,2* |
1State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China
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| Cite this article: |
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Xiaomin Zhang, Jian Wang, Wenkai Zhu et al 2024 Chin. Phys. Lett. 41 067503 |
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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 Fe$_{3}$GaTe$_{2}$, synthesized by the self-flux method, exhibiting a Curie temperature ($T_{\rm C}$) of 370 K, a high saturation magnetization of 33.47 emu/g, and a large PMA energy density of approximately $4.17 \times 10^{5}$ J/m$^{3}$. Furthermore, the magneto-optical effect is systematically investigated in Fe$_{3}$GaTe$_{2}$. The doubly degenerate $E_{\rm 2g} (\varGamma)$ mode reverses the helicity of incident photons, indicating the existence of pseudoangular-momentum (PAM) and chirality. Meanwhile, the non-degenerate non-chiral $A_{\rm 1g}(\varGamma)$ 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.
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Received: 08 April 2024
Published: 20 June 2024
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| PACS: |
75.70.Ak
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(Magnetic properties of monolayers and thin films)
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85.70.Ay
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(Magnetic device characterization, design, and modeling)
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78.20.Ls
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(Magneto-optical effects)
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