High-temperature ferromagnetism and large anomalous Hall conductivity (AHC) in two-dimensional (2D) magnets are highly desirable for ultrathin 2D spintronic devices, as they endow these devices with superior magnetic stability and efficient spin-current conversion capabilities, thereby driving advancements in low-power and high-density spintronic technologies. Here, by first-principles calculations, we study the electronic and magnetic properties of ${\mathrm{Fe}}_4{\mathrm{GaTe}}_2$ which is an energetically and dynamically stable van der Waals ferromagnet with an in-plane magnetic anisotropy. Notably, we show that the Curie temperatures of monolayer, bilayer, triple-layer, quadruple-layer, and bulk ${\mathrm{Fe}}_4{\mathrm{GaTe}}_2$ are all above room temperature. By reorienting their spins from in-plane to out-of-plane, monolayer, few-layer, and bulk ${\mathrm{Fe}}_4{\mathrm{GaTe}}_2$ exhibit a large AHC range from 427–540 S/cm at the Fermi level, which is related to the $M_y$ mirror symmetry breaking. Furthermore, monolayer ${\mathrm{Fe}}_4{\mathrm{GaTe}}_2$ display perpendicular magnetic anisotropy under electron doping and retains the high Curie temperature and large AHC. Our findings suggest that van der Waals room-temperature ferromagnet ${\mathrm{Fe}}_4{\mathrm{GaTe}}_2$ holds promising applications in practical spintronic devices.

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• Anomalous Hall effect
• Doping effects
• Electronic structure
• Magnetic anisotropy
• Magnetic interactions
• Magnetism
• 2-dimensional systems
• Ferromagnets
• van der Waals systems
• First-principles calculations
• Heisenberg model
• Monte Carlo methods