LogAmplifier SingleCrystal Electronics Ptfe PMNPT Strontium Blend Piezoresponse Protein Magnetic Force Microscopy Piezoelectric SFAs kelvin probe force microscopy LFM Piezo DeoxyribonucleicAcid Optical ForceDistanceSpectroscopy Indium_tin_oxide CaMnO3 Polydimethylsiloxane CrossSection Platinum Wang DIWafer Film KelvinProbeForceMicroscopy AlkaneFilm fe_nd_b FM-KPFM AM-KPFM Fujian CuFoil amplitude_modulation BCZT