Unexpected temperature and velocity dependencies of atomic-scale stick-slip friction

I. Barel, M. Urbakh, L. Jansen, and A. Schirmeisen
Phys. Rev. B 84, 115417 – Published 14 September 2011

Abstract

We report experiments of atomic stick-slip friction on NaCl that were performed over a wide range of surface temperatures and scanning velocities. As in previous experiments, we found a nonmonotonic relation between the time-averaged friction and temperature. In contrast to the previous works, here atomic-scale stick-slip friction was resolved for all measured temperatures and velocities. We further introduce a model that explicitly includes a periodic structure of a multi-asperity contact, and we demonstrate that the simulations reproduce the experimental observations. The presented results show that analysis of mean friction force only is not enough for an unambiguous understanding of the friction mechanisms, and measurements of force traces at different temperatures and velocities provide important additional information.

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  • Received 23 June 2011

DOI:https://doi.org/10.1103/PhysRevB.84.115417

©2011 American Physical Society

Authors & Affiliations

I. Barel and M. Urbakh*

  • School of Chemistry, Tel Aviv University, 69978 Tel Aviv, Israel

L. Jansen

  • Center for Nanotechnology (CeNTech), University of Münster, Münster, Germany

A. Schirmeisen

  • Institute of Applied Physics (IAP), Justus-Liebig University Giessen, Giessen, Germany

  • *urbakh@post.tau.ac.il

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Issue

Vol. 84, Iss. 11 — 15 September 2011

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