GalliumPhosphide Gold Cobalt MultiferroicMaterials SKPM Bismuth MfmPhase Friction ForceMapping OrganicSemiconductor CrAu Annealing nanobar BiVO4 Anneal Steps ConductiveAFM VerticalPFM Switching Forevision Sio2 NanoLithography PMNPT ThermalConductivity NUS_Physics PinpointPFM Ferroelectric CNT Oxidation hetero_structure StrontiuTitanate mechanical_property PetruPoni Ito BCZT