non_contact silicon_oxide DentalProsthesis Leakage atomic_steps Stiffness molecule Gallium contact cannabidiol pinpoint mode Magnetic Force Microscopy self_healing Reduction Magnetostrictive Glass cannabis Iron OpticalWaveguide Transparent Alloy ThermalConductivity solar_cell HanyangUniv WWafer PinpointPFM FM-KPFM Ucl Ferrite kelvin probe force microscopy Chungnam_National_University Genetic Conducting PrCurve KAIST