LogAmplifier Singapore optoelectronics PetruPoni_Institute Magnetic Force Microscopy Defect SelfAssembly Gallium_Arsenide Oxidation WWafer MagneticForceMicroscopy FastScan semifluorinated_alkane semifluorinated_alkanes layers GlassTemp Korea Piranha Piezoresponse StyreneBeads IcelandSpar LiquidCrystal Neodymium flakes nanobar HfO2 Non-ContactMode SiWafer Tungsten TipBiasMode Beads Phase Fet PANI ScanningSpreadingResistanceMicroscopy