Recently, with the miniaturization of electronic devices, there is an urgent need to use two-dimensional (2D) ferromagnetic materials with outstanding properties (such as high conductivity, better stability, etc.) and high Curie temperature (T_C) in spintronic devices. By first-principles calculations based on density functional theory, we predict two new ferromagnetic metal monolayers M₂As (M = Mn, Fe) with hight dynamic and thermal stabilities. Caculation results show that M₂As monolayers possess high spin polarization ratio (27.3% for Mn₂As and 52.6% for Fe₂As), obvious out-of-plane magnetic anisotropy and large magnetic perpendicular anisotropy (101 μeV/Mn for Mn₂As and 84 μeV/Fe for Fe₂As). In addition, we found that the Mn₂As monolayer exhibit high temperature ferromagnetism (T_C = 450 K); while for the Fe₂As monolayer, a high Curie temperature of 251 K was predicted. Moreover, we applied biaxial strain to the material to examine the changes in its magnetic properties and found that under a certain biaxial strain, Mn₂As monolayer will have a ferromagnetic-antiferromagnetic phase transition, while Fe₂As monolayer may exhibit a higher T_C. Our findings render M₂As (M = Mn, Fe) monolayers potential candidates for future spintronics and pave the way for exploring novel 2D magnetism in arsenic-based magnetic materials.

近年来，随着电子器件的小型化，迫切需要在自旋电子器件中使用具有优异性能（如高导电性、更好的稳定性等）和高居里温度（T _C）的二维（2D）铁磁材料. 通过基于密度泛函理论的第一性原理计算，我们预测了两种具有高动态和热稳定性的新型铁磁金属单层 M ₂ As (M = Mn, Fe)。计算结果表明，M ₂ As 单层具有高自旋极化率（Mn ₂ As为 27.3%，Fe ₂ As为 52.6% ）、明显的面外磁各向异性和大的磁垂直各向异性（Mn ₂为 101 μeV/Mn对于 Fe ₂ As，As 和 84 μeV/Fe ）。此外，我们发现Mn ₂ As单层表现出高温铁磁性（T _C  = 450 K）；而对于 Fe ₂ As 单层，预测居里温度高达 251 K。此外，我们对材料施加双轴应变来检查其磁性能的变化，发现在一定的双轴应变下，Mn ₂ As 单层将具有铁磁-反铁磁相变，而 Fe ₂ As 单层可能表现出更高的T _C . 我们的发现使 M ₂由于（M = Mn，Fe）单层是未来自旋电子学的潜在候选者，并为探索砷基磁性材料中的新型二维磁性铺平了道路。