Magnetic Properties of Ge-Doped Fe3GaTe2 van der Waals Ferromagnets.

Recently, van der Waals magnetic materials have garnered extensive research attention. Among them, Fe3GaTe2 possesses strong magnetic anisotropy and a Curie temperature (TC) above room temperature, exhibiting great application potential in spintronics. Furthermore, Fe3GaTe2 shows good responsiveness to elemental doping. However, doping at Fe atomic sites with magnetic metal atoms, while modifying TC of Fe3GaTe2, disrupts its intrinsic ferromagnetic coupling interactions. This leads the doped Fe3GaTe2 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 Fe3GaTe2 and Fe3GeTe2 and, thus, adopted Ge doping at Ga atomic sites. Compared with magnetic atom doping, this approach can effectively manipulate the ferromagnetism and TC of Fe3GaTe2 while minimizing the disruption to its intrinsic ferromagnetism. Our work enriches the options for manipulating the magnetism of Fe3GaTe2 via doping and opens up new directions for the magnetic manipulation of Fe3GaTe2.