TransitionMetal HOPG NTU Grain kelvin probe force microscopy FailureAnlaysis FFM Platinum University_of_Regensburg DOE hard_disk_media PyroelectricDetector ring shape lift_mode Perovskite Conducting Copolymer hard_disk NCM\ Electrical&Electronics IndiumTinOxide Water Phase Pzt KPFM Pyroelectric NUS_NNI_Nanocore Pipette Chungnam_National_University PvdfFilm temp_control #EC polyvinyl acetate self-assembled_monolayer PolycrystallineFerroelectricBCZT