STM ElectrostaticForceMicroscopy NUS_Physics Ferroelectric Growing Insulator Roughness Chloroform 2dMaterials Conductive AFM Reading TempControl HDD FailureAnlaysis Yeditepe_University Vanadate PpLdpe Copper LFM silicon_oxide temp Tape Force-distance Pyroelectric Silver TungstenDeposition DOE CuSubstrate domain_switching ring shape Tin sulfide CaMnO3 Pore FrequencyModulation Ram