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In this paper we present the microscopic origin of the ferromagnetism ofFe0.25TaS2 and its finite-temperature magnetic properties. We first obtain theband structures of Fe0.25TaS2 by the first-principles calculations and findthat both conventional and Dirac carriers coexist in metallic Fe0.25TaS2.Accordingly, considering the spin-orbit coupling of Fe 3d ion, we derive aneffective RKKY-type Hamiltonian between Fe spins in the presence of both theconventional parabolic-dispersion and the Dirac linear-dispersion carriers,which contains a Heisenberg-like, an Ising-like and an XY-like term. Inaddition, we obtain the ferromagnetic Curie temperature Tc by using the clusterself-consistent field method. Our results could address not only the highferromagnetic Curie temperature, but also the large magnetic anisotropy inFexTaS2.

Ferromagnetism in layered metallic Fe1/4TaS2 in the presence of conventional and Dirac carriers