cross section ForceVolume China ScratchMode Regensburg Inorganic_Compound Sperm GalliumPhosphide AtomicSteps HighAcpectRatio MagneticForceMicroscopy FailureAnlaysis SingleCrystal Non-ContactMode IIT-chennai Copper AM_SKPM mechanical_property CarbonNanotube FM_KPFM PhaseChange Mechanical&nanotechnology Wang Device Film Dopped Annealed suspended_graphene Step HiVacuum Array ContactMode Calcite SurfaceOxidation single_layer