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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.50: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Fluctuations and jump dynamics in atomic friction experiments — •Sabine Maier^1,2, Yi Sang¹, Tobin Filleter¹, Martin Grant¹, Roland Bennewitz¹, Enrico Gnecco², and Ernst Meyer² — ¹Department of Physics, McGill University, Montreal, Quebec, Canada — ²Department of Physics and Astronomy, University of Basel, Switzerland

We studied atomic stick-slip processes by means of friction force microscopy with high spatial and temporal resolution on KBr(100) in ultra-high vacuum. These processes are caused by the jump of the tip from one atomic position to the next. The occurrence of such stick-slip behavior is one-to-one related to energy loss in the sliding process. Thermal fluctuations in the combined system of tip, surface, and force sensor play a crucial role in the dynamics of the stick-slip behavior.

We characterized the influence of the tip-sample contact on the thermal fluctuations of the force sensor and on the dynamics of the stick-slip process. Results are compared with simulations based on an extended Tomlinson model including thermal fluctuations. A correlation between the duration of the atomic slip event and the atomic structure of the contact is established.