cross section BoronNitride kelvin probe force microscopy Force-distance CompactDisk Switching HOPG Melt GalliumPhosphide conductive PyroelectricDetector Ca10(PO4)6(OH)2 Mechinical Nanofiber CastIron CopperFoil Galfenol Collagen Lateral sputter Holes BiFeO3 PUR LiquidImaging NusEce Ceramics HexagonalBN Boundary Domain AdhesionForce Hexylthiophene FrictionalForceMicroscopy PetruPoni_Institute Pipette OpticalWaveguides