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Molecular Dynamics Simulation of Mechanical Deformation of Ultra-Thin Amorphous Carbon Films

Published online by Cambridge University Press:  15 February 2011

J. N. Glosli ,
M. R. Philpott  and
J. Belak
J. N. Glosli
Affiliation:
University of California, Lawrence Livermore National Laboratory, Livermore, CA 94550
M. R. Philpott
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120-6099
J. Belak
Affiliation:
University of California, Lawrence Livermore National Laboratory, Livermore, CA 94550
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Abstract

Amorphous carbon films approximately 20nm thick are used throughout the computer industry as protective coatings on magnetic storage disks. The structure and function of this family of materials at the atomic level is poorly understood. Recently, we simulated the growth of a:C and a:CH films 1 to 5 nm thick using Brenner's bond-order potential model with added torsional energy terms. The microstructure shows a propensity towards graphitic structures at low deposition energy (<1eV) and towards higher density and diamond-like structures at higher deposition energy (>20eV). In this paper we present simulations of the evolution of this microstructure for the dense 20eV films during a simulated indentation by a hard diamond tip. We also simulate sliding the tip across the surface to study dynamical processes like friction, energy transport and microstructure evolution during sliding.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 383: Symposium I – Mechanical Behavior of Diamond and Other Forms of Carbon , 1995 , 431
Copyright
Copyright © Materials Research Society 1995

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References

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