Above-room-temperature strong intrinsic ferromagnetism in 2D van der Waals Fe3GaTe2 with large perpendicular magnetic anisotropy

Gaojie Zhang, Fei Guo, Hao Wu, Xiaokun Wen, Li Yang, Wen Jin, Wenfeng Zhang and Haixin Chang ()
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Gaojie Zhang: Huazhong University of Science and Technology
Fei Guo: Guangxi University of Science and Technology
Hao Wu: Huazhong University of Science and Technology
Xiaokun Wen: Huazhong University of Science and Technology
Li Yang: Huazhong University of Science and Technology
Wen Jin: Huazhong University of Science and Technology
Wenfeng Zhang: Huazhong University of Science and Technology
Haixin Chang: Huazhong University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The absence of two-dimensional (2D) van der Waals (vdW) ferromagnetic crystals with both above-room-temperature strong intrinsic ferromagnetism and large perpendicular magnetic anisotropy (PMA) severely hinders practical applications of 2D vdW crystals in next-generation low-power magnetoelectronic and spintronic devices. Here, we report a vdW intrinsic ferromagnetic crystal Fe3GaTe2 that exhibits record-high above-room-temperature Curie temperature (Tc, ~350-380 K) for known 2D vdW intrinsic ferromagnets, high saturation magnetic moment (40.11 emu/g), large PMA energy density (~4.79 × 105 J/m3), and large anomalous Hall angle (3%) at room temperature. Such large room-temperature PMA is better than conventional widely-used ferromagnetic films like CoFeB, and one order of magnitude larger than known 2D vdW intrinsic ferromagnets. Room-temperature thickness and angle-dependent anomalous Hall devices and direct magnetic domains imaging based on Fe3GaTe2 nanosheet have been realized. This work provides an avenue for room-temperature 2D ferromagnetism, electrical control of 2D ferromagnetism and promote the practical applications of 2D-vdW-integrated spintronic devices.

Date: 2022
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DOI: 10.1038/s41467-022-32605-5

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