Weymouth, Alfred J. and Gretz, Oliver and Riegel, Elisabeth and Giessibl, Franz J. (2022) Measuring sliding friction at the atomic scale. JAPANESE JOURNAL OF APPLIED PHYSICS, 61: SL0801. ISSN 0021-4922, 1347-4065
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Sliding friction is a nonconservative force in which kinetic energy is dissipated via various phenomena. We used lateral force microscopy to measure the energy loss as a tip oscillates laterally above a surface with sub-Angstrom amplitudes. By terminating the tip with a single molecule, we ensure the tip ends in a single atom. We have reported that energy is dissipated as a CO molecule at the tip apex is oscillated over pairs of atoms. This is a result of the CO being bent in different directions as the tip moves in one direction and then in the other. We confirm this with a model that describes the CO on the tip as a torsional spring. Surprisingly, we only observe dissipation within a small range of tip heights. This allows us to determine the necessary components to model friction and shows how sensitive friction is to the local potential energy landscape.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FORCE MICROSCOPY REVEALS; SENSOR; lateral force microscopy; sliding friction; dynamic force microscopy; atomic friction |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Franz J. Giessibl |
| Depositing User: | Petra Gürster |
| Date Deposited: | 07 Sep 2023 06:54 |
| Last Modified: | 29 Feb 2024 14:53 |
| URI: | https://pred.uni-regensburg.de/id/eprint/56946 |
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