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Accelerated Molecular Dynamics Simulation of AFM Experiments Using the Bond-Boost Method

Published online by Cambridge University Press:  01 February 2011

Woo Kyun Kim  and
Michael L. Falk
Woo Kyun Kim
Affiliation:
wkkim@umich.edu, The University of Michigan, Mechanical Engineering, 2300 Hayward St., Ann Arbor, MI, 48109, United States
Michael L. Falk
Affiliation:
mfalk@umich.edu, The University of Michigan, Materials Science and Engineering, 2300 Hayward St., Ann Arbor, MI, 48109, United States
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Abstract

Accelerated molecular dynamics (MD) simulations of recent Atomic Force Microscope (AFM) experiments on oxidized silicon surfaces demonstrate a nontrivial dependence of frictional force on sliding velocity as well as temperature. By implementing hyper dynamics (HD) via the bond-boost method these simulations achieve sliding velocities in the range of real experimental values. Moreover, an analysis of the effects of temperature and sliding velocity on friction provide evidence for a systematic deviation from the modified Tomlinson model. We hypothesize regarding the origin of these deviations, and use the simulations to analyze the atomic processes that accompany sliding.

Keywords

simulationSitribology

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1085: Symposium T – Nanoscale Tribology–Impact for Materials and Devices , 2008 , 1085-T02-02
Copyright
Copyright © Materials Research Society 2008

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References

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