Asymmetric alloy formation at the Fe-on-Ti and Ti-on-Fe interfaces
| Autor: | L. Bujdosó, András Kovács, Sz. Sajti, P. Süle, Judit Balogh, Dénes Kaptás, Dániel G. Merkel, A. Nakanishi, Zsolt Endre Horváth, László Bottyán |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Nanostructure Alloy Analytical chemistry 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Evaporation (deposition) Vacuum evaporation X-ray reflectivity Transmission electron microscopy 0103 physical sciences engineering General Materials Science 0210 nano-technology Spectroscopy Reflectometry |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal. 30(45) |
| ISSN: | 1361-648X |
| Popis: | The Fe-on-Ti and Ti-on-Fe interfaces were studied experimentally by Mossbauer spectroscopy (MS), transmission electron microscopy (TEM) and x-ray reflectometry (XRR) on Ti/Fe/Ti trilayers grown on Si(1 1 1) substrates by vacuum evaporation. The nanoscale structure and composition were explored in cross sections using TEM, the layer structure and the interface widths by specular x-ray reflectometry. MS was applied to identify the interface alloy phases and to determine the pure and alloyed Fe layer fractions. The experimental results were compared with molecular dynamics (MD) simulations of layer growth on Fe or Ti underlayers of different orientations. The concentration distributions provided by MD simulations show an asymmetry at the interfaces in the layer growth direction. The transition is atomically sharp at the Ti-on-Fe interface for the (0 0 1) and (1 1 0) crystallographic orientations of the Fe underlayer, while it spreads over a few atomic layers for Fe(1 1 1) underlayer and for all studied Ti underlayer orientations at the Fe-on-Ti interface. MS and XRR data on Ti/Fe/Ti trilayers confirm the asymmetry between the bottom and top Fe interface, but the inferred interface widths considerable exceed those deduced from the MD simulations. |
| Databáze: | OpenAIRE |
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