A Magnetic Phthalocyanine Thin Film on Monolayer Graphene Probed in the Mesoscopic Regime

Decoration of graphene with adatoms or molecules usually degrades graphene's mobility, limiting its performance in hybrid devices. In a recent work, we observed that when bilayer graphene is decorated with a molecular thin film of Copper Phthalocyanine (CuPc), its mobility is preserved, while triggering a charge transfer of ~10^12 /cm^2. Most importantly, we observed that the CuPc molecules restore weak localization in bilayer graphene [1]. Here, we extend our work to a monolayer graphene on h-BN decorated with a thin film of Manganese Phthalocyanine (MnPc). Like CuPc, MnPc has an unpaired electron, but leading to a more important magnetic moment. MnPc is known to transition to a long range magnetic ordered state at 8.3 K. We present our efforts to produce a high mobility graphene/h-BN heterostructure by mechanically cleaning graphene's surface through atomic force microscopy in contact mode, prior to depositing the MnPc molecules. Future experiments with metal free phthalocyanine, will allow us to assess the effect of the magnetic order in the molecular thin film, on the electronic transport in graphene, probed in the mesoscopic regime.