ring shape CastIron INSP pinpoint mode flakes Sio2 TemperatureControllerAFM Morphology MagneticPhase PVA Piezoelectric Array polyvinyl acetate FrictionForce Polyurethane SiWafer SFAs Polyimide PolyvinylideneFluoride Vortex hetero_structure self-assembled_monolayer kelvin probe force microscopy Conductivity mechanical property PiezoelectricForceMicroscopy PpLdpe FrictionalForce Thermoplastic_polyurethane VinylAlcohol NeodymiumMagnets HighResolution Chemical Vapor Deposition PtfeFilter Moire