ChemicalCompound PinPointMode Sulfur BiFeO3 Vortex SKKU membrane CHRYSALIS_INC Tape Lateral_Force_Microscopy Barium_titanate LateralForceMicroscopy Deposition Switching Modulus SurfaceOxidation Change PVAC PDMS Led Vac OrganicSemiconductor UnivCollegeLondon HBN SKPM Multiferroic_materials Sapphire Phosphide PetruPoni_Institute self-assembly contact AnodizedAluminumOxide MoS2 Polyurethane Filter