SingleLayer suspended_graphene temperature controller AFM cannabinoid Corrosion Domain margarine Defect Solar Subhajjit BFO MESA structure ContactMode Multiferroic_materials AmplitudeModulation TungstenDeposition Chungnam_National_University ScanningThermalMicroscopy Insulator Non-ContactMode Cobalt Electrode neodymium_magnets LightEmiting Bismuth StainlessSteel Fluoride food Blood Conductive AFM light_emitting TemperatureControlledAFM Polarization Vac Chromium