vertical_PFM LowDensityPolyethylene Tin disulfide PVAC LiftHeight LiNbO3 strontiu_titanate FrictionalForce single_layer Granada UnivCollegeLondon Stiffness IMT_Bucharest UnivOfMaryland fe_nd_b SKPM ForceDistanceSpectroscopy Wafer GaN Gallium_Arsenide NUSNNI TemperatureControlledAFM CompactDisk ThermalConductivity MLCC Butterfly Insulator Lateral FM_SKPM PolycrystallineFerroelectricBCZT Al2O3 Chloroform Pinpoint tip_bias_mode Styrene