Interface-enhanced room-temperature Curie temperature in CrPS4/graphene van der Waals heterostructure

The authors experimentally show here that the Curie temperature of van der Waals CrPS${}_{4}$ is elevated from 40 K up to room temperature by the interfacial effect from graphene. The compatible Fermi level between CrPS${}_{4}$ and graphene enables sufficient interfacial charge transfer across their atomically fine interface, leading to promoted exchange coupling and higher Curie temperature of CrPS${}_{4}$ without the participation of strong spin-orbit coupling. The enhanced magnetism of CrPS${}_{4}$ further induces room-temperature exchange splitting in graphene by the magnetic proximity effect.