FrictionalForceMicroscopy SelfAssembly PatternedSapphireSubstrat Writing KAIST NiFe Layer WS2 polyvinyl acetate SiliconCrystal SurfaceOxidation light_emission atomic_steps PolyvinylideneFluoride self-assembled_monolayer TungstenDeposition hard_disk_media SKKU Corrosion domain_switching HDD Metal-organicComplex Pattern Copolymer LeakageCurrent F14H20 Hafnia fifber Electrode Sic TiO2 Crystal Fet KPFM Wildtype