Title: Decoupling of graphene from Ni(111) via oxygen intercalation,
Abstract: The combination of the surface science techniques (STM, XPS, ARPES) and
density-functional theory calculations was used to study the decoupling of
graphene from Ni(111) by oxygen intercalation. The formation of the
antiferromagnetic (AFM) NiO layer at the interface between graphene and
ferromagnetic (FM) Ni is found, where graphene protects the underlying AFM/FM
sandwich system. It is found that graphene is fully decoupled in this system
and strongly $p$-doped via charge transfer with a position of the Dirac point
of $(0.69\pm0.02)$ eV above the Fermi level. Our theoretical analysis confirms
all experimental findings, addressing also the interface properties between
graphene and AFM NiO.