PMNPT Boron Hydroxyapatite BiFeO3 Array Polarization Forevision #EC MESA structure Pinpoint Ferroelectric Mfm PVAC LiftHeight ScanningIon-ConductanceMicroscopy BlockCopolymer Filter Metal-organicComplex Aluminum self-assembled_monolayer SPMLabs Polyvinylidene Polystyrene Hexylthiophene MfmPhase HBN polymeric_arrays BiVO4 SingleLayer piezoelectric force microscopy thermal_property small_scan Terrace suspended_graphene VerticalPFM