Above-room-temperature strong intrinsic ferromagnetism in 2D van der Waals Fe<sub>3</sub>GaTe<sub>2</sub> with large perpendicular magnetic anisotropy.
basic_science · Level V
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- Record sourced from PubMed, PMID 36038556.
- Also identified by DOI 10.1038/s41467-022-32605-5 and PMC identifier 9424191.
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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 Fe<sub>3</sub>GaTe<sub>2</sub> 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 × 10<sup>5 </sup>J/m<sup>3</sup>), 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 Fe<sub>3</sub>GaTe<sub>2</sub> 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.