LFM HfO2 BCZT PVAP3HT ChemicalCompound membrane Conductivity ContactMode FM_SKPM AdhesionForce OpticalModulator Vortex Ucl 2dMaterials Neodymium Zhi Resistance MeltingPoint MultiferroicMaterials StrontiumTitanate SiliconCrystal InsulatorFilm Leakage FM-KPFM ThermalProperties fifber Chrome PtfeFilter Sphere AtomicSteps hydrocarbon OpticalWaveguide FailureAnlaysis Potential Piezoelectric