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Surface Stress Effect on the Elastic Moduli of Superlattice Thin Films

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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.

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Acknowledgements

We gratefully acknowledge useful discussions with B.M. Clemens, S.A. Dregia, K.A. Green, and I. C. Oppenheim.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD, 21218

    R. C. Cammarata & K. Sieradzki

  2. Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD, 21218

    F. H. Streitz

Authors
  1. R. C. Cammarata
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  2. K. Sieradzki
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  3. F. H. Streitz
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Cammarata, R.C., Sieradzki, K. & Streitz, F.H. Surface Stress Effect on the Elastic Moduli of Superlattice Thin Films. MRS Online Proceedings Library 160, 53–57 (1989). https://doi.org/10.1557/PROC-160-53

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  • DOI: https://doi.org/10.1557/PROC-160-53

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