Permalloy Writing Protein Friction Gold BaTiO3 VerticalPFM alkanes Defects self-assembled_monolayer Step Reduction tip_bias_mode Lattice Spain Formamidinium_lead_iodide PECurve AM_KPFM Tungsten_disulfide NCM Pinpoint PFM OrganicSemiconductor CarbonNanotube high_resolution BoronNitride Hysteresys PhaseImaging Annealing IndiumTinOxide PpLdpe ScanningIon-ConductanceMicroscopy HardDisk TungstenThinFilmDeposition Chungnam_National_University margarine