Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 65: Methods: Theory and Experiment
O 65.6: Talk
Thursday, February 28, 2008, 13:15–13:30, MA 141
Temperature dependence of stick-slip friction on graphite — •Lars Jansen1,2, Harald Fuchs1,2, and André Schirmeisen1,2 — 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhlem-Klemm-Strasse 10, 48149 Münster — 2CeNTech, Center for NanoTechnology, Heisenbergstrasse 11, 48149 Münster
The so called stick-slip phenomenon, where the tip of an atomic force microscope performs a saw-tooth like motion over a surface, is believed to be a fundamental process in atomic friction, whose investigation has become a huge challenge over the past years [1,2].
We measured atomic scale stick-slip friction on a graphite surface with an atomic force microscope under ultrahigh vacuum conditions in a temperature range from 100 K to 300 K.
In this talk, we show the results of our experiments concerning friction vs. scan-speed curves for different temperatures. Furthermore we compare our experimental results to the thermally activated Prandtl-Tomlinson-model as described by Sang et al. [3]. This allows us the direct evaluation of crucial parameters like the energy barrier and the microscopic damping coefficient, which is often assumed to be in the lower limit of aperiodic damping.
[1] Schirmeisen, Jansen, Fuchs, PRB 71, p. 245403 (2005)
[2] Evstigneev, Schirmeisen, Jansen, Fuchs, Reimann, PRL 97, p.
240601 (2006)
[3] Sang, Dubé, Grant, PRL 87, p. 174301 (2001)