Ram exfoliate Glass ElectrostaticForceMicroscopy Annealed hard_disk_media graphene_hybrid Water Lattice HOPG Polarization GaP Layer ForceMapping PiezoelectricForceMicroscopy Phosphide UnivCollegeLondon Floppy HighAspect Nickel WS2 DeflectionOptics EvatecAG Jason CalciumHydroxyapatite Polyimide Piezoresponse SiliconOxide semifluorinated_alkanes PMNPT Wang Ucl fluoroalkane SRAM MESA structure