BismuthFerrite Hexylthiophene PinpointPFM Dopped Lattice PetruPoni_Institute ItoGlass HardDisk China plastic Sidewall MagneticForceMicroscopy TyphimuriumBiofilm Change LiNbO3 Scratch polyvinyl acetate temperature_control SFAs CrAu BariumTitanate NUS_Physics SelfAssembly SoftSample kelvin probe force microscopy Ceramics BCZT HOPG membrane CHRYSALIS_INC Solar atomic_steps SurfaceChange SKPM BiasMode