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We have grown a series of single crystals of two-dimensional van der Waals ferromagnet Fe₃GaTe₂ substituted with Co or Ni. The large single crystals of (F{e₁-ₗCoₗ) }₃GaTe₂ (00. 55) and (F{e₁-ₗNiₗ) }₃GaTe₂ (00. 46) were characterized with x-ray diffraction, magnetic susceptibility, electrical resistivity, and Hall measurements. Our results show that the magnetic transition temperatures of Fe₃GaTe₂ are gradually suppressed upon Co or Ni doping. A small amount of Co or Ni doping results in a significant increase of the coercive field. In particular, Co doping tunes the crystals from ferromagnetism to antiferromagnetism and then to the spin-glass state, while Ni doping tunes the crystals from ferromagnetism to spin-glass states. The strong doping-dependent magnetic properties suggest that Fe₃GaTe₂ has great potential for spintronic applications.
Zhu et al. (Mon,) studied this question.