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Elsevier, Superlattices and Microstructures, (88), p. 551-560, 2015

DOI: 10.1016/j.spmi.2015.10.015

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Peculiar effective elastic anisotropy of nanometric multilayers studied by surface Brillouin scattering

Journal article published in 2015 by D. Faurie ORCID, P. Djemia, O. Castelnau, R. Brenner, Laurent Belliard, Ph Goudeau, E. Le Bourhis, P.-O. Renault
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Abstract

We show in this paper by using a two-scale transition model that the elastic anisotropy of a thin film specimen can be tuned by appropriate stacking design. The anisotropic behaviour is illustrated for two monophase thin films, namely W which is perfectly elastically isotropic and Au which is strongly elastically anisotropic, and for a nanometric W/Au multilayers. The experimental measurements show that the model capture the elastic anisotropy rather well even for a nanometric multilayer stacking (period of 12 nm) and that the elastic anisotropy of W/Au multilayer is more pronounced than the ones of the two components for a fraction of 50%. This enhanced anisotropy is discussed in view of the multilayer microstructure.