SFAs Liquid Treatment Zhi HardDiskMedia piezoelectric force microscopy PS_PVAC Stiffness Switching Ito MBE Inorganic LiNbO3 frequency_modulation Floppy LowDensityPolyethylene Graphite solar_cell Spincast mfm_amplitude BFO Styrene Array BreastCancerCell SrTiO3 Materials SSRM SingleCrystal OxideLayer Biofilm cannabis Polymer Permalloy Transparent ShenYang