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Tribology Letters

, 67:59 | Cite as

Atomic Friction: Anisotropy and Asymmetry Effects

  • Gregor Fessler
  • Ali Sadeghi
  • Thilo GlatzelEmail author
  • Stefan Goedecker
  • Ernst Meyer
Original Paper
  • 135 Downloads

Abstract

The NaCl(001) surface was investigated by friction force microscopy in ultra-high vacuum conditions at room temperature. A homemade atomic force microscope was used which allows an in situ sample rotation. With this ability, it is not only possible to measure friction along arbitrary orientations of the NaCl crystal, but also the symmetry directions of the sample can be precisely tuned parallel to the scan orientation which is fixed orthogonal to the cantilever axis for a calibrated friction measurement. With such a perfect alignment, the tip moves over identical crystallographic positions along the whole scanned line of a couple of nanometers. A relative shift along the slow scan direction was observed between forward and backward scanned force maps. By reconstructing the tip path, we identified five distinguishable modes of tip motions, and found that the asymmetric friction loops are predominant. Prandtl-Tomlinson simulations based on a sinusoidal corrugation potential cannot reproduce the experimental observation. Instead a very good agreement is achieved using an ab initio calculated interaction potential. Measurements along arbitrary orientations show a monotonic decrease of the friction coefficient towards the [110] direction in agreement with the simulation results.

Keywords

Nanotribology Friction anisotropy Tomlinson model DFT Atomic stick slip 

Notes

Acknowledgements

The authors would like to thank the Swiss National Foundation (SNF), the Swiss Nanoscience Institute (SNI), and the SINERGIA Project CRSII2 136287\(\backslash\)1 for their financial support. Computing time was provided by the CSCS under Project Number s707.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of PhysicsBaselSwitzerland
  2. 2.Glas Trösch AG SilverstarBützbergSwitzerland
  3. 3.Department of PhysicsShahid Beheshti University TehranIran

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