MagneticPhase Temperature Galfenol ScanningSpreadingResistanceMicroscopy HighAcpectRatio PinPointMode Photovoltaics thermal_property flakes GlassTemperature FrequencyModulation ForceVolumeMapping Aluminum TransitionMetal ring shape AmplitudeModulation WS2 SKKU Bismuth ConductiveAFM VortexCore CP-AFM Growth Inorganic WWafer electrospinning Deposition MeltingPoint NUS GaAs 2d_materials aluminum_nitride Inorganic_Compound BismuthFerrite organic_polymer