ナノ滑りの動摩擦力

抄録

We developed a new apparatus using the probe-tip-quartz-crystal resonator technique, and measured the dynamical frictional force acting on HOPG and C₆₀ substrates by a sliding Si₃N₄ tip as a function of sliding distance. It was found that the dynamical frictional force undergoes a drastic change when the oscillation amplitude is approximately the lattice constant of each substrate: For a small case, it is directly proportional to the amplitude, while for a large case, it does not depend on the amplitude. The observed behavior is qualitatively understood by a simple one-dimensional Tomlinson model. Then, we can conclude that the principal mechanism of energy dissipation due to the frictional force does not depend on sliding distance.