AM_KPFM phase_change StainlessSteel block_copolymer TungstenDeposition NUS_NNI_Nanocore MultiLayerCeramicCapacitor Roughness STO BiVO4 Liquid Microchannel Vacuum Solution Hysteresys hard_disk FM_SKPM dielectric trench LithiumNiobate MagneticForceMicroscopy Conduct FM_KPFM Piezoresponse FuelCell PUR PinpointNanomechanicalMode University_of_Regensburg UnivCollegeLondon vertical_PFM AEAPDES medical F14H20 contact ring shape 2dMaterials