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Surface Stress Effect on the Elastic Moduli of Superlattice Thin Films

Published online by Cambridge University Press:  28 February 2011

R. C. Cammarata ,
K. Sieradzki  and
F. H. Streitz
R. C. Cammarata
Affiliation:
Department of Materials Science and Engineering
K. Sieradzki
Affiliation:
Department of Materials Science and Engineering
F. H. Streitz
Affiliation:
Department of Physics and Astronomy The Johns Hopkins University Baltimore, MD 21218
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Abstract

A thermodynamic model is presented which predicts a significant sample size effect on the elastic moduli of superlattice thin films possessing small bilayer repeat lengths. Owing to the presence of incoherent (incommensurate) interfacial stresses, biaxial in-plane strains are created which are approximately inversely proportional to the bilayer repeat length Λ. When Λ is of the order of 1 nm, these strains can be of the order of 1%, inducing nonlinear elastic behavior. This model is able to explain in a quantitative way the existence of a “supermodulus” effect in certain metallic superlattices.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 160 , 1989 , 53
Copyright
Copyright © Materials Research Society 1990

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