Abstract
The occurrence of multiple jumps in 2D atomic-scale friction measurements is used to quantify the viscous damping accompanying the stick–slip motion of a sharp tip in contact with a NaCl(001) surface. Multiple slips are observed without apparent wear for normal forces between 13 and 91 nN. For scans parallel to [100] directions, the tip jumps between minima of the substrate corrugation potential in a zigzag fashion. An algorithm is applied to determine histograms of lateral force jumps which characterize multiple slips. The same algorithm is used to classify multiple slips occurring in calculated lateral force maps. Comparisons between simulations and experiments indicate that the nanometer-sized contact is underdamped at intermediate loads (13–26 nN) and becomes slightly overdamped at higher loads. The proposed procedure is a novel way to estimate the lateral contact damping which plays an important role in the interpretation of measurements of the velocity and temperature dependence of friction, of slip duration, and of the reduction of friction by applied perpendicular or parallel oscillations.
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Acknowledgment
We acknowledge the EUROCORE program FANAS, the Swiss National Center of Competence in Research on Nanoscale Science, and the Swiss National Science Foundation for financial support.
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Roth, R., Glatzel, T., Steiner, P. et al. Multiple Slips in Atomic-Scale Friction: An Indicator for the Lateral Contact Damping. Tribol Lett 39, 63–69 (2010). https://doi.org/10.1007/s11249-009-9567-7
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DOI: https://doi.org/10.1007/s11249-009-9567-7