HOPG FM_SKPM Optoelectronic BiFeO3 VortexCore BFO LateralForceMicroscopy Singapore MonoLayer ThinFilm Mobile Phase kelvin probe force microscopy ScanningThermalMicroscopy IVSpectroscopy Neodymium TemperatureControllerAFM MultiLayerCeramicCapacitor MechanicalProperties AdhesionEnergy PVAC mfm_amplitude Dimethicone Cross-section PinpointNanomechanicalMode Multiferroic_materials IMT_Bucharest silicon_carbide temp Composition Tin disulfide polymeric_arrays Resistance LiIonBattery semifluorinated_alkanes