ScanningSpreadingResistanceMicroscopy hard_disk PolycrystallineFerroelectricBCZT ring shape Defects fluorocarbon IcelandSpar UnivCollegeLondon LifeScience Scanning_Thermal_Microscopy AmplitudeModulation HydroGel Conductivity temp_control Korea nanomechanical Ananth Thermal Annealed Annealing LiquidCrystal Phosphide MoS2 MLCC AAO Silver BaTiO3 TemperatureControlledAFM VortexCore SmalScan NCM non_contact DNAProtein University_of_Regensburg PDMS