Magnetic Properties of Ge-Doped Fe ₃ GaTe ₂ van der Waals Ferromagnets

Recently, van der Waals magnetic materials have garnered extensive research attention. Among them, Fe 3 GaTe 2 possesses strong magnetic anisotropy and a Curie temperature (T C ) above room temperature, exhibiting great application potential in spintronics. Furthermore, Fe 3 GaTe 2 shows good responsiveness to elemental doping. However, doping at Fe atomic sites with magnetic metal atoms, while modifying T C of Fe 3 GaTe 2, disrupts its intrinsic ferromagnetic coupling interactions. This leads the doped Fe 3 GaTe 2 to exhibit properties such as antiferromagnetism, which is unfavorable for the exploitation of its intrinsic ferromagnetism. Under such circumstances, we noticed the similar structures and ferromagnetism between Fe 3 GaTe 2 and Fe 3 GeTe 2 and, thus, adopted Ge doping at Ga atomic sites. Compared with magnetic atom doping, this approach can effectively manipulate the ferromagnetism and T C of Fe 3 GaTe 2 while minimizing the disruption to its intrinsic ferromagnetism. Our work enriches the options for manipulating the magnetism of Fe 3 GaTe 2 via doping and opens up new directions for the magnetic manipulation of Fe 3 GaTe 2 .