▎ 摘　　要

We studied the mechanical properties of a suspended graphene layers which have ripples with stripe pattern, by using an atomic force spectroscopy. The local spring constant of the rippled graphene layer has larger value at concave region and smaller at convex region. The attractive force and pull-off force between a tip and the sample also have larger values at the concave region. A local spring constant mapping on the suspended graphene with ripple was obtained and nonlinear behavior of the force-distance curve was analyzed regarding local deformation of the sample. (C) 2010 American Institute of Physics. [doi:10.1063/1.3456007]