HDD Au111 layers Hexylthiophene Fendb Boundary MagneticForceMicroscopy Microchannel NUS KPFM lithography Ananth DNAProtein Mfm Yttria_stabilized_Zirconia Topography molecules domain_switching Mobile Copolymer CopperFoil Mechanical&nanotechnology 2d_materials silicon_oxide FFM CNT Domain Pores LateralForceMicroscopy self_assembly PvdfBead CaMnO3 MultiferroicMaterials Modulus Polyimide