Giant coercivity enhancement in a room-temperature van der Waals magnet through substitutional metal-doping.

FeGeTe ( = 3, 4, and 5) systems, two-dimensional (2D) van der Waals (vdW) ferromagnetic (FM) metals with high Curie temperatures (), have been intensively studied to realize all-2D spintronic devices. Recently, an intrinsic FM material FeGaTe with high (350-380 K) has been reported. As substitutional doping changes the magnetic properties of vdW magnets, it can be a powerful means for engineering the properties of magnetic materials.