Non-ContactMode ElectrostaticForceMicroscopy TappingMode BiVO4 CuFoil Galfenol AlkaneFilm self_assembly LMF PolyvinylideneFluoride Nanopattern lithography Gong Scanning_Thermal_Microscopy ThermalDetectors IIT-chennai Wafer HACrystal Hexacontane Ito ItoGlass SrTiO3 frequency_modulation Copolymer Cobalt-dopedIronOxide Phase Calcite dielectric_trench Ananth SThM PDMS Oxidation Indent Roughness OpticalElement