Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 31: Tribology

O 31.2: Talk

Tuesday, March 17, 2015, 14:15–14:30, MA 144

Stochastic stick-slip friction on oxide thin films — •Andra D. Craciun, Jean-Louis Gallani, and Mircea V. Rastei — Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS, Université de Strasbourg, F-67034 Strasbourg, France

Most of sliding surfaces in micro- and nano-mechanical devices are covered by native oxides [1]. Little is known however about nanoscale friction on these surfaces [2,3]. Here, we report on lateral forces needed to move a nanoscale asperity on various oxide thin films, as studied by an atomic force microscope operating in vacuum and at different temperatures. Force-distance traces unveil erratic stick-slip movements separated by several nanometers. The variations of friction force with normal load demonstrate dispersive adhesive interactions at interface. We modeled our findings by considering a Lennard-Jones-like interaction potential, which accounts for changes in the effective contact area. The model captures the formation and fluctuation of stick-slip phases and provides guidelines for predicting transitions from stick-slip to continuous sliding.

[1] See proceedings of IEEE 27th annual international conference on MEMS San Francisco, California (2014). [2] A. Schirmeisen, L. Jansen, H. Holscher, H. Fuchs, Appl. Phys. Lett. 88, 123108 (2006). [3] M. Lessel, P. Loskill, F. Hausen, N. Gosvami, R. Bennewitz, K. Jacobs, Phys. Rev. Lett. 111, 035502 (2013).