MultiferroicMaterials KelvinProbeForceMicroscopy PFM tip_bias_mode Polytetrafluoroethylene cross section Roughness Phase Mobile PolyvinylAcetate CeNSE_IISc SingleLayer Resistance #Materials organic_polymer Photovoltaics MeltingPoint PinpointNanomechanicalMode single_layer fifber Growing Nanotechnology Mosfet Calcium NUS_NNI_Nanocore AmplitudeModulation Ceramics Mfm CrossSection Titanate Thermoplastic_polyurethane Piezo VerticalPFM sputter YszSubstrate