light_emitting multi_layer ULCA Non-ContactMode Conductive AFM NUS_Physics CrystalGrowing Multiferroic_materials BlockCopolymer Polyethylene PolymerBlend Led Pinpoint atomic_layer Jason SmalScan chemical_compound Bismuth mechanical_property PatternedSapphireSubstrat SingleLayer Sulfur India BismuthVanadate ReflexLens CuFoil LMF FrequencyModulation NeodymiumMagnets fifber Etch ScratchMode PhaseImaging Step C_AFM