Galfenol VerticalPFM BiFeO3 DIWafer LiIonBattery Roughness ScanningTunnelingMicroscopy Calcium Terrace Photovoltaics tip_bias_mode Thermal Ni-FeAlloy Polyaniline AM-KPFM Dimethicone Hair PVAC Composition mono_layer Nanostructure thermal_property PhaseImaging BreastCancerCell Annealed Collagen GaAs PetruPoni_Institute HanyangUniv TPU Conduct LateralPFM TransitionMetal Growth STM