amplitude_modulation ContactMode Cobalt LeakageCurrent PhaseImaging non_contact membrane thermoplastic_elastomers Hexacontane hard_disk solar_cell Polymer HardDiskMedia Calcium Aluminum AdhesionEnergy FrictionalForceMicroscopy heterojunctions Chungnam_National_University Collagen Fujian semifluorinated_alkanes Wonseok Sadowski LFM Workfunction AM_KPFM MagneticArray TipBiasMode SoftSample Celebration gallium_nitride Croatia Phthalocyanine Memory