Magnetic Force Microscopy LeakageCurrent Steps light_emitting Tapping Morphology domain_switching MagneticForce Step SurfaceChange BCZT NCM\ FM-KPFM Spincast tip_bias_mode lift_mode CrAu Fiber Conduct AtomicSteps lithography Galfenol Memory CalciumHydroxyapatite PolyStylene TappingMode cross section molecule VerticalPFM MultiferroicMaterials University_of_Regensburg Litho AAO Film temp