Power law load dependence of atomic friction

Details Power law load dependence of atomic friction Power law load dependence of atomic friction

2004-04-02

arxiv.org/abs/cond-mat/0404044v1

Appl. Phys. Lett. 84, 699 (2004)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1063/1.1644617

We present a theoretical study of the dynamics of a tip scanning a graphite surface as a function of the applied load. From the analysis of the lateral forces, we extract the friction force and the corrugation of the effective tip-surface interaction potential. We find both the friction force and potential amplitude to have a power law dependence on applied load with exponent $\sim 1.6$. We interpret these results as characteristic of sharp undeformable tips in contrast to the case of macroscopic and elastic microscopic contacts.

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