  We report the magnitude of the induced magnetic moment in CVD-grown epitaxial
and rotated-domain graphene in proximity with a ferromagnetic Ni film, using
polarized neutron reflectivity (PNR) and X-ray magnetic circular dichroism
(XMCD). The XMCD spectra at the C K-edge confirms the presence of a magnetic
signal in the graphene layer and the sum rules give a magnetic moment of up to
$\sim\,0.47\,\mu$_B/C atom induced in the graphene layer. For a more precise
estimation, we conducted PNR measurements. The PNR results indicate an induced
magnetic moment of $\sim$ 0.53 $\mu$_B/C atom at 10 K for rotated graphene and
$\sim$ 0.38 $\mu$_B/C atom at 10 K for epitaxial graphene. Additional PNR
measurements on graphene grown on a non-magnetic Ni_9Mo_1 substrate, where no
magnetic moment in graphene is measured, suggest that the origin of the induced
magnetic moment is due to the opening of the graphene's Dirac cone as a result
of the strong C pz-3d hybridization.
