oxide_layer biocompatible HighAcpectRatio Zagreb PinpointPFM Polyvinylidene_fluoride EFMAmplitude Non-ContactMode bias_mode BiasMode ring shape Implant nanomechanical Praseodymium AM_SKPM PolyimideFilm PvdfBead PetruPoni_Institute DeflectionOptics SKPM BFO FailureAnlaysis IIT-chennai Ptfe norganic Chrome HfO2 Tin disulfide TemperatureControllerStage PolycrystallineFerroelectricBCZT StyreneBeads Pipette Conductance PhaseChange Gallium_Arsenide