1State Key Laboratory of Functional Materials for Informatics, Center for Excellence in Superconducting Electronics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China 3Department of Physics and State Key Laboratory of Surfac Physics, Fudan University, Shanghai 200433, China 4State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 5Wuhan National High Magnetic Field Center and Institute for Quantum Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 6Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China 7Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China 8Shenzhen R&D Center of Huazhong University of Science and Technology, Shenzhen 518000, China 9School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Abstract：Fe$_{3}$GaTe$_{2}$, a recently discovered van der Waals ferromagnetic crystal with the highest Curie temperature and strong perpendicular magnetic anisotropy among two-dimensional (2D) magnetic materials, has attracted significant attention and makes it a promising candidate for next-generation spintronic applications. Compared with Fe$_{3}$GeTe$_{2}$, which has the similar crystal structure, the mechanism of the enhanced ferromagnetic properties in Fe$_{3}$GaTe$_{2}$ is still unclear and needs to be investigated. Here, by using x-ray magnetic circular dichroism measurements, we find that both Ga and Te atoms contribute to the total magnetic moment of the system with antiferromagnetic coupling to Fe atoms. Our first-principles calculations reveal that Fe$_{3}$GaTe$_{2}$ has van Hove singularities at the Fermi level in nonmagnetic state, resulting in the magnetic instability of the system and susceptibility to magnetic phase transitions. In addition, the calculation results about the density of states in ferromagnetic states of two materials suggest that the exchange interaction between Fe atoms is strengthened by replacing Ge atoms with Ga atoms. These findings indicate the increase of both the itinerate and local moments in Fe$_{3}$GaTe$_{2}$ in view of Stoner and exchange interaction models, which results in the enhancement of the overall magnetism and a higher Curie temperature. Our work provides insight into the underlying mechanism of Fe$_{3}$GaTe$_{2}$'s remarkable magnetic properties and has important implications for searching 2D materials with expected magnetic properties in the future.
. [J]. 中国物理快报, 2023, 40(8): 87501-.
Heming Zha, Wei Li, Gaojie Zhang, Wenjing Liu, Liwei Deng, Qi Jiang, Mao Ye, Hao Wu, Haixin Chang, and Shan Qiao. Enhanced Magnetic Interaction between Ga and Fe in Two-Dimensional van der Waals Ferromagnetic Crystal Fe$_{3}$GaTe$_{2}$. Chin. Phys. Lett., 2023, 40(8): 87501-.
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2023, Vol. 40 
