Dresden 2017 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 34: Poster session II
MM 34.4: Poster
Dienstag, 21. März 2017, 18:30–20:30, P4
Friction under active control — •Victor Pfahl1, Walter Arnold2, and Konrad Samwer1 — 11. Physikalisches Institut, Universität Göttingen — 2Department of Materials and Materials Technology, Saarland University
Dissipation of mechanical and kinetic energy at a sliding contact strongly depends on the topological structure and chemistry of the contact and on the dissipation mechanism of the underlying material. Instead of varying these mechanisms we are using external acoustic excitations and/or temperature variation to control friction actively.
Friction is measured with the lateral force microscopy (LFM) mode of an atomic force acoustic microscope (AFAM) and by studying micro-sliding in AFAM mode using acoustic excitation of the contact resonance frequency.
We investigated the reduction of friction of Si, amorphous PdCuSi and LaSrMnO as a function of amplitude of the cantilever at different temperatures. We can report a reduction of friction up to 100% on every system.
Due to a metal-metal transition near 350K temperature dependent measurements on LaSrMnO are interesting. The damping of the cantilever oscillations caused by micro-sliding of the cantilever tip on the surface decreases with temperature parallel to the increase in resistivity of the thin film. The behavior of the cantilever damping constant demonstrates that there is a direct coupling between mechanical friction and mobility of the electrons in the LSMO film.
We would like to thank the DFG for funding CRC 1073 Project A1.