Sliding friction mechanism on ultra precision surface in atomic scale

摘要

In order to clarify the atomic-scale stick-slip phenomenon which is commonly observed in the surface measurement using AFM, several molecular dynamics simulations have been performed. In the molecular dynamics simulations, a specimen and a slider are assumed to consist of monocrystalline copper and rigid diamond, respectively, and Morse potential is postulated between a pair of atoms. In the simulations, influence of the cantilever stiffness and dynamics of the specimen surface atoms on atomic-scale stick-slip phenomenon are investigated. The simulation confirms that the atomic-scale stick-slip phenomenon can be expressed using the molecular dynamics and that the stick-slip phenomenon of the surface atoms of the specimen affects upon the stick-slip phenomenon of the spring force. These results indicate that molecular dynamics simulation has an advantage in deciding the spring constant of cantilevers.