FM-KPFM India single_layer Growth EFMAmplitude Worcester_Polytechnic_Institute Modulus Titanate membrane CastIron I-VSpectroscopy HACrystal VerticalPFM Vanadate hard_disk Kevlar EFM Lattice Praseodymium TCS ElectroDeposition LiquidCrystal HardDiskMedia ElectrostaticForceMicroscopy Pyroelectric TipBiasMode CNT ConductiveAFM Current ScanningKelvinProbeMicroscopy Gold Sio2 Cobalt-dopedIronOxide PvdfBead GaP