Two-dimensional (2D) magnetic materials, characterized by their unique low-dimensional magnetism and rich quantum transport properties, serve as a pivotal platform for the exploration of innovative spintronic functionalities. However, the simultaneous realization of stable room-temperature ferromagnetism, perpendicular magnetic anisotropy, and adjustable anomalous Hall transport in atomically thin materials presents a formidable challenge in this research domain. Recently, Associate Professor Hou Yusheng and his team from Sun Yat-sen University have conducted a systematic investigation into the magnetic evolution of rare-earth-based 2D surface alloys GdM₂ (where M = Cu, Ag, Au), transitioning from metal-substrate-supported structures to free-standing monolayers, utilizing first-principles calculations. The study unveiled that, in the metal-substrate-supported state, the GdM₂ monolayers undergo structural bending and charge redistribution owing to interfacial coupling effects, thereby weakening the overall ferromagnetic properties. Upon removal of the metal substrate, the intrinsic magnetism of the GdM₂ monolayers is fully manifested. Through the synergistic regulation of electronic structure and local structural effects, the free-standing monolayers GdCu₂, GdAg₂, and GdAu₂ all exhibit ferromagnetism above room temperature, with Curie temperatures approximately reaching 385 K, 390 K, and 315 K, respectively. Remarkably, the GdAu₂ monolayer further displays perpendicular magnetic anisotropy and an adjustable anomalous Hall effect. This research offers fresh perspectives for the design of innovative 2D magnetic materials that integrate room-temperature ferromagnetism, perpendicular magnetic anisotropy, and adjustable anomalous Hall effect.