kelvin probe force microscopy neodymium_magnets UTEM CP-AFM Pinpoint PFM high_resolution Led Tape SiliconeOxide NUS PANI Austenite FailureAnlaysis Al2O3 Mechinical Polymer Solution Silver Semiconductor TemperatureControlledAFM Microchannel Annealed IVSpectroscopy MfmPhase FrictionalForceMicroscopy Scratch SiWafer ring shape Crystal exfoliate aluminum_nitride TungstenDeposition MLCC Trench P3HT