We analyzed the protective ability of chemical vapor deposition (CVD) graphene domains against corrosion of Cu surfaces. Fresh graphene domains of various shapes were ideal corrosion-inhibiting layers. However, obvious corrosion was found within graphene domains exposed to the air for over a week. Our work demonstrates that the opportunities for corrosion of CVD graphene were provided by wrinkles but not others, such as Cu grain boundaries and graphene domain boundaries, which are always believed the primary factor for inferior quality of the CVD graphene at present.

Fabrication of highly mobile spin-polarized two-dimensional electron gas (2DEG) is crucially important for both fundamental and applied research. Usually, spin polarization appears below 10 K for the 2DEG of LaAlO 3 /SrTiO 3 interface, stemming from the magnetic ordering of Ti 3+ ions with the mediation of itinerant electrons. Herein, we report a magnetic 2DEG at a La 7/8 Sr 1/8 MnO 3 -buffered LaAlO 3 /SrTiO 3 interface, which simultaneously shows electrically tunable anomalous Hall effect and high conductivity. The spin-polarized temperature for the 2DEG is promoted to 30 K while the mobility remains high. The magnetism likely results from a gradient manganese interdiffusion into SrTiO 3 . The present work demonstrates the great potential of manganite-buffered LaAlO 3 /SrTiO 3 interfaces for spintronic applications.