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ring shape VerticalPFM Ceramics 3-hexylthiophene frequency_modulation Ferroelectric EFMAmplitude PetruPoni IcelandSpar MetalCompound Hydroxyapatite organic_polymer Gold BCZT #Materials doped Dopped Pinpoint PFM FailureAnalysis P3HT dielectric_trench Tapping Piezoelectric Leakage Roughness Magnetic Force Microscopy Inorganic PinPointMode Composite HighAspect PUR Battery Perovskite AIN YszSubstrate