Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)
O 17.43: Poster
Montag, 26. März 2007, 17:30–20:30, Poster C
The influence of temperature on stick-slip friction — •Lars Jansen1,2, André Schirmeisen1,2, Mykhaylo Evstigneev3, Peter Reimann3, and Harald Fuchs1,2 — 1Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Straße 10, 4819 Münster — 2CeNTech, Center for NanoTechnology, Heisenbergstraße 11, 48149 Münster — 3Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld
The stick-slip phenomenon, where the sliding body performs a saw-tooth like motion over a surface, is believed to be a fundamental process in atomic friction.
We measured atomic scale stick-slip friction on a HOPG surface with an atomic force microscope under ultrahigh vacuum conditions in a temperature range from 100 K to 300 K. In this work, we present our investigations of the temperature dependence of atomic friction.
On the one hand we show a direct analysis of the influence of temperature by measuring friction vs. scan-speed curves for different temperatures and compare our results with the thermally activated Thomlinson model as described by Sang et al. [1].
On the other hand we present a direct verification of our measurements with results predicted by rate-theory, where the thermal transitions are described by Kramer's rate and show that this theory only holds for fast sliding velocities [2]. We hypothesize that the failure of rate theory in the slow velocity regime is related to multiple contact formation at the tip sample contact.
[1] Sang et al., Phys. Rev. Lett. 84, 174301 (2001)
[2] Evstigneev et al., Phys. Rev. Lett. 97, 240601 (2006)