Abstract
We studied both mechanisms of the scan velocity saturation of the average friction force of friction force microscopy and the resonant reduction in the average friction force by superimposing torsional oscillation on a cantilever on the basis of the one-dimensional Tomlinson model at a finite temperature. The velocity saturation is caused by the appearance of a high degree of slip motion for a tip, which is induced by increasing the scan velocity. We proposed two possible mechanisms for the resonant reduction in the average friction force, namely, the enhanced synchronous slip motion of a tip atom with a support point and the activated slip motion of a tip atom caused by oscillation excitation at a stick point. The calculated results reproduce the experimental results well.
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