Multiscaling behavior of atomic-scale friction.
- Jannesar M Department of Physics, Kashan University, Kashan 8731751167, Iran.
- Jamali T School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran.
- Sadeghi A Department of Physics, Shahid Beheshti University, G.C., Evin, Tehran 19839, Iran.
- Movahed SMS Department of Physics, Shahid Beheshti University, G.C., Evin, Tehran 19839, Iran.
- Fesler G Departement Physik, Universität Basel, Klingelbergstr. 82, 4056 Basel, Switzerland.
- Meyer E Departement Physik, Universität Basel, Klingelbergstr. 82, 4056 Basel, Switzerland.
- Khoshnevisan B Department of Physics, Kashan University, Kashan 8731751167, Iran.
- Jafari GR Department of Physics, Shahid Beheshti University, G.C., Evin, Tehran 19839, Iran.
- 2017-07-16
Published in:
- Physical review. E. - 2017
English
The scaling behavior of friction between rough surfaces is a well-known phenomenon. It might be asked whether such a scaling feature also exists for friction at an atomic scale despite the absence of roughness on atomically flat surfaces. Indeed, other types of fluctuations, e.g., thermal and instrumental fluctuations, become appreciable at this length scale and can lead to scaling behavior of the measured atomic-scale friction. We investigate this using the lateral force exerted on the tip of an atomic force microscope (AFM) when the tip is dragged over the clean NaCl (001) surface in ultra-high vacuum at room temperature. Here the focus is on the fluctuations of the lateral force profile rather than its saw-tooth trend; we first eliminate the trend using the singular value decomposition technique and then explore the scaling behavior of the detrended data, which contains only fluctuations, using the multifractal detrended fluctuation analysis. The results demonstrate a scaling behavior for the friction data ranging from 0.2 to 2 nm with the Hurst exponent H=0.61±0.02 at a 1σ confidence interval. Moreover, the dependence of the generalized Hurst exponent, h(q), on the index variable q confirms the multifractal or multiscaling behavior of the nanofriction data. These results prove that fluctuation of nanofriction empirical data has a multifractal behavior which deviates from white noise.
- Language
-
- English
- Open access status
- green
- Identifiers
-
- DOI 10.1103/PhysRevE.95.062802
- PMID 28709272
- Persistent URL
- https://sonar.ch/global/documents/92169
Statistics
Document views: 36
File downloads:
- Full-text: 0