Steps BismuthFerrite PVAC Heat MultiferroicMaterials Cobalt-dopedIronOxide STM single_layer atomic_steps neodymium_magnets fluorocarbon CVD Ferroelectric YttriaStabilizedZirconia HighResolution ScanningThermalMicroscopy Blend ScanningIon-ConductanceMicroscopy Sio2 Jason Electrical&Electronics NTU temperature_control Boundary Bismuth ConductiveAFM PDMS sputter Ucl Potential C_AFM 2-vinylpyridine NtuEee Switching Iron