PFM Metal FrictionalForceMicroscopy high_resolution AlkaneFilm Polytetrafluoroethylene Al2O3 Polydimethylsiloxane LightEmiting SiliconOxide MechanicalProperties Magnetostrictive HighAspect small_scan Laser FastScan vertical_PFM ring shape PvdfFilm SolarCell TempControl AdhesionEnergy membrane Chungnam_National_University SiWafer Permalloy organic_polymer OrganicCompound Platinum polymeric_arrays Tungsten HiVacuum NUS_Physics Bismuth temp_control