Two-dimensional (2D) magnetic materials are of not only fundamental scientific interest but also promising candidates for numerous applications. However, so far only a few intrinsic magnets with long-ranged order down to the 2D limit have been experimentally established. Here, we report that the intrinsic 2D ferromagnetism can be realized in van der Waals (vdW) Fe₃GaTe₂ nanoflake down to monolayer. By measuring the Hall resistance and magnetoresistance, we demonstrate that the Fe₃GaTe₂ monolayer exhibits 2D hard ferromagnetism with record-high Cure temperature (T_c) of 240 K for the monolayer of known intrinsic ferromagnets. Both of square-shaped hysteresis loops with near-vertical jump in anomalous Hall effect (AHE) and the negative magnetoresistance (NMR) behavior with an applied out-of-plane magnetic field reveal robust perpendicular magnetic anisotropy (PMA) in Fe₃GaTe₂ nanoflakes down to the monolayer limit. Furthermore, we find the intrinsic mechanism that stems from the Berry curvature of electronic bands dominates AHE of nanoflakes in the low temperature range. Our results not only provide an excellent candidate material for next-generation spintronic applications, but also open up a platform for exploring physical mechanisms in 2D ferromagnetism.

二维 (2D) 磁性材料不仅具有基础科学意义，而且也是众多应用的有希望的候选材料。然而，到目前为止，仅通过实验建立了少数具有低至二维极限的长程有序的本征磁体。在这里，我们报道了本征的二维铁磁性可以在范德华（vdW）Fe ₃ GaTe ₂纳米片直至单层中实现。通过测量霍尔电阻和磁阻，我们证明 Fe ₃ GaTe ₂单层表现出二维硬铁磁性，其固化温度 ( T c ) 为已知单层本征铁磁体的创纪录高值 ( T _{c ) 240 K。}反常霍尔效应 (AHE) 中具有近垂直跳跃的方形磁滞回线和施加面外磁场的负磁阻 (NMR) 行为都揭示了 Fe 3 GaTe 2 中强大的垂直磁各向异性₍ PMA ₎纳米薄片降至单层极限。此外，我们发现电子带贝里曲率的内在机制在低温范围内主导纳米片的 AHE。我们的研究结果不仅为下一代自旋电子学应用提供了优秀的候选材料，而且还为探索二维铁磁性物理机制开辟了平台。