Glass Galfenol Tapping MagneticForce self-assembly CuFoil Electronics CrossSection HydroGel Chemical_Vapor_Deposition PinpointPFM HOPG exfoliate Magnetostrictive Hexylthiophene Inorganic Kevlar VortexCore KAIST ScanningKelvinProbeMicroscopy FM_KPFM Fujian PFM Change Conducting VerticalPFM Hafnium_dioxide BoronNitride NUS_NNI_Nanocore mfm_amplitude FrictionForce Electrical&Electronics LeakageCurrent HexagonalBoronNitride CaMnO3