  In this paper, we propose a practical way to stabilize half-hydrogenated
graphene (graphone). We show that the dipole moments induced by an
hexagonal-boron nitride (h-BN) substrate on graphene stabilize the hydrogen
atoms on one sublattice of the graphene layer and suppress the migration of the
absorbed hydrogen atoms. Based upon first principle spin polarized density of
states (DOS) calculations, we show that the half hydrogenated graphene
(graphone) obtained in different graphene-h-BN heterostructures exhibits a half
metallic state. We propose to use this new exotic material for spin valve and
other spintronics devices and applications.
