vertical_PFM SiliconeOxide Bmp Wildtype Calcium Formamidinium_lead_iodide mfm_amplitude MechanicalProperties NUS_Physics food Conductance HanyangUniv C_AFM ThinFilm NeodymiumMagnets SSRM membrane Solution Tungsten Ceramics ScratchMode Ceramic contact rubber Conductive AFM Wonseok piezoelectric force microscopy dielectric_trench AM-KPFM semifluorinated alkane SurfaceChange Hair GaN CP-AFM Modulus