HardDiskMedia neodymium_magnets Pyroelectric NUS_NNI_Nanocore OrganicCompound AAO LeakageCurrent HOPG Pattern Zagreb OxideLayer CrAu PinpointNanomechanicalMode Stiffness UnivCollegeLondon P3HT Lateral_Force_Microscopy FM_KPFM Ptfe Wang Sidewall polymeric_arrays Forevision CrossSection Hole Piranha Fe_film Graphite CastIron CaMnO3 Scratch Conductive AFM PolymerPatterns Permalloy KelvinProbeForceMicroscopy