  We demonstrate electrical spin injection from a ferromagnet to a bilayer
graphene (BLG) through a monolayer (ML) of single-crystal hexagonal boron
nitride (h-BN). A Ni81Fe19/ML h-BN/BLG/h-BN structure is fabricated using a
micromechanical cleavage and dry transfer technique. The transport properties
across the ML h-BN layer exhibit tunnel barrier characteristics. Spin injection
into BLG has been detected through non local magnetoresistance measurements.
