HOPG Defect WWafer Thermal lithography self-assembly temperature controller AFM Trench MfmAmplitude ferromagnetic Mechinical IMT_Bucharest Stiffness PolyvinylAcetate Chemical Vapor Deposition HighResolution Friction Scanning_Thermal_Microscopy Graphene GalliumPhosphide Potential Polystyrene AM-KPFM HardDiskMedia ScanningIon-ConductanceMicroscopy LightEmiting nanomechanical ForceMapping Oxidation MagneticForceMicroscopy HexagonalBoronNitride LaAlO3 Worcester_Polytechnic_Institute high_resolution BTO