  We study the magnetic coupling between different ferromagnetic metals (FMs)
across a graphene (G) layer, and the role of graphene as a thin covalent
spacer. Starting with G grown on a FM substrate (Ni or Co), we deposit on top
at room temperature different FM metals (Fe, Ni, Co). By measuring the dichroic
effect of 3p photoemission lines we detect the magnetization of the substrate
and the sign of the exchange coupling in FM overlayer at room temperature. We
show that the G layer magnetically decouples the FM metals.
