Hafnia MultiferroicMaterials Workfunction Electrode ScanningSpreadingResistanceMicroscopy solar_cell ring shape Perovskite BFO Sidewall SingleLayer Treatment Pinpoint PFM Titanate fluoroalkane Oxidation ContactMode TappingMode ElectroChemical Dopped Flake semifluorinated alkane Hysteresys Dental AmplitudeModulation CalciumHydroxide Fe_film Heat Trench Copper SrTiO3 Corrosion Edwin MeltingPoint Device