Proximity effects in the graphene–Co3Sn2S2 interface

Abstract

In graphene, the linear dependence of the density of states on energy and the low density of these valence band states around the Fermi energy make this material an ideal candidate for the observation of the proximity effects, when it is placed in contact with other functional materials. In this work, we explore the possible effects of the magnetic proximity and charge transfer on the interfacial properties of a graphene layer adsorbed on the (001) surface of Co₃Sn₂S₂, the bulk phase of which is known as a topological quasi-2D semimetal in the half-metallic ferromagnetic state. Both counterparts mutually influence the properties of the heterostructure. Thus, formation of the interface allows tuning the electronic and magnetic properties of graphene over a wide range depending on the composition of the Co₃Sn₂S₂ interface layer. A synergy between graphene and Co₃Sn₂S₂(001) enhances the perpendicular magnetic anisotropy energy of the systems, which is highly promising for the development of new magnetic recording media. As a reference for future experimental studies, the C 1s core-level shifts and C K near-edge X-ray absorption fine structure spectra are calculated for all considered cases.