Conductivity Graphite NCM\ heterojunctions Pinpoint PFM CrossSection Boundary polymeric_arrays BiFeO3 Nanotechnology MeltingPoint multi_layer VortexCore Current AdhesionForce align SAM GalliumPhosphide 2d_materials Metal Gallium UnivCollegeLondon PhaseTransition Glass WS2 DataStorage Trench PolyimideFilm Sic IRDetector Non-ContactMode Gallium_Arsenide block_copolymer nanobar MfmAmplitude