Magnetic Force Microscopy Magnetic temp neodymium_magnets Grain Hafnium_dioxide LowDensityPolyethylene bias_mode Mfm BreastCancerCell Nanostructure Battery contact Water Singapore ThermalProperties Piezoresponse SFAs LightEmiting TemperatureControlledAFM Hysteresys MfmAmplitude Foil HexagonalBoronNitride Tapping fluorocarbon doped FM_KPFM Optoelectonics LiftHeight Global_Comm layers Subhajjit OpticalWaveguide kelvin probe force microscopy