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 58.39: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

Dynamic Friction Force Microscopy: Imaging via control of nonlinear cantilever oscillation — •Felix Mertens, Thomas Göddenhenrich, and André Schirmeisen — Institut für Angewandte Physik, Justus-Liebig-Universität Gießen, D-35392 Gießen

A dynamic friction force microscopy technique is presented, which uses the nonlinear cantilever oscillation response to control the sample modulation amplitude. A periodic stick-slip motion of the tip at higher modulation amplitudes leads to an additional cantilever resonance frequency signal due to a self-excited cantilever oscillation. Using a lock-in amplifier together with a modulation amplitude feedback control system, friction contrast in terms of the modulation amplitude near the nonlinear-to-linear regime can be obtained. Applying this technique on HOPG, the observed friction images clearly reveal higher friction at step edges as well as an area contrast otherwise unseen in the topography.