Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.1: Poster
Mittwoch, 13. März 2013, 18:15–21:45, Poster B1
Temperature dependent wear experiments on the nanoscale — •Johannes Sondhauß1, Harry Mönig1, Harald Fuchs1, and André Schirmeisen2 — 1Institute of Physics, University of Münster, Germany — 2Institute of Applied Physics, University of Giessen, Germany
The importance of wear effects on small scales, e.g. with regard to moving mechanical components in MEMS, motivated increased efforts to analyze the basic mechanisms of wear at the nanoscale. Especially the atomic force microscope (AFM) has been proved useful to study wear effects on the atomic scale [1, 2]. Typically, the models used to describe the observed wear characteristics are based on Arrhenius kinetics and therefore a thermally activated characteristic is expected. However, a complete picture of the fundamental wear processes is still under debate. In this work we performed wear experiments as a function of temperature. We used Si-tips to wear single step edges on a KBr(001)-crystal. The measurements were conducted under UHV-conditions in a temperature range between 100 K and 300 K. We investigated the effect of different loads and, as a further important channel, we simultaneously measured the friction force acting between tip and sample during the wear process. With our results we are able to make an assessment if nanoscale wear can be described by an Arrhenius type model. In addition the influence of the different components of the acting normal and frictional stresses inside the contact area is discussed.
[1] Sheehan, Chem. Phys. Lett. 410, 151-155 (2005)
[2] Gotsmann and Lantz, Phys. Rev. Lett. 101, 125501 (2008)