PetruPoni Barium_titanate PrCurve Stiffness MESA structure Ferroelectric kelvin probe force microscopy SICM suspended_graphene SurfaceChange Zagreb ForceVolumeMapping MolecularSelfAssembly layers Bismuth PhaseChange MetalCompound AmplitudeModulation Nanopattern MechanicalProperty mechanical property LifeScience TCS Fluoride DLaTGS PetruPoni_Institute WWafer Organic StrontiumTitanate Phase DataStorage OpticalWaveguide FastScan Imprint SFAs