| Autor: |
Roy Clarke, H. David He, F. J. Lamelas |
| Rok vydání: |
1991 |
| Předmět: |
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| Zdroj: |
Physical review. B, Condensed matter. 43(15) |
| ISSN: |
0163-1829 |
| Popis: |
We describe a one-dimensional x-ray-scattering model that includes discrete layer-thickness fluctuations and interfacial diffusion in the kinematical approximation. We demonstrate the use of the model in an analysis of the out-of-plane scattering intensities of epitaxial Co-Au and Co-Cu superlattices. In the case of Co-Au superlattices, the experimental data show that interfacial diffusion is limited to a two-monolayer region, and that layer-thickness fluctuations are of order \ifmmode\pm\else\textpm\fi{}1 monolayer. The superlattice features in Co-Cu superlattice measurements are shown to arise from lattice-spacing modulations and are insensitive to composition modulation. The measured intensities are consistent with Co-Cu interfaces which are 2 monolayers thick. A dilation of the Co lattice in the direction of growth is observed for both Co-Au and Co-Cu superlattices. We speculate that the expansion is due to a slightly reduced density of atoms in an imperfectly stacked structure. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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