Nanoscale diffusion in Pt/56Fe/57Fe thin-film system

Low-temperature diffusion of Fe in Pt/56Fe/57Fe thin films (grown on MgO (100) substrate) was investigated between 703K and 813K using secondary neutral mass spectrometry. The activation energy of the effective interdiffusion coefficients, evaluated by the “centre-gradient” method, is 1.53±0.25eV re...

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Published inThin solid films Vol. 589; pp. 173 - 181
Main Authors Tynkova, A., Katona, G.L., Erdélyi, G., Daróczi, L., Oleshkevych, А.I., Vladymyrskyi, I.A., Sidorenko, S.I., Voloshko, S.M., Beke, D.L.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2015
Subjects
Annealing
Diffusion
Grain boundaries
Grain boundary diffusion
Interdiffusion
Mathematical models
Nanostructure
Platinum
Self-diffusion
Thin films
Interdiffusion
Nanostructure
Grain-boundary diffusion
Self-diffusion
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Summary:Low-temperature diffusion of Fe in Pt/56Fe/57Fe thin films (grown on MgO (100) substrate) was investigated between 703K and 813K using secondary neutral mass spectrometry. The activation energy of the effective interdiffusion coefficients, evaluated by the “centre-gradient” method, is 1.53±0.25eV reflecting a strong contribution from grain boundaries. This is also supported by the observed deep penetrations of Pt into the 56Fe layer, from which the grain boundary diffusion coefficients for Pt in Fe were also estimated and 1.45±0.25eV activation energy was obtained. A simple model, including the effect of grain boundaries to the overall intermixing at the original sharp interfaces in nanocrystalline films, is developed. This predicts that at short annealing times the grain boundary diffusion dominates, and bulk diffusion coefficients can be determined only in long time limit. At intermediate annealing times, when the grain boundaries are saturated but the bulk diffusion is still negligible, there are no changes in the composition profiles. This yields good qualitative agreement with the experimental data and offers explanation for the time and temperature dependence of the interdiffusion coefficients obtained in similar systems. •Effective self-diffusion coefficients for Fe were determined in the range 703-813K•Time dependent effective diffusion coefficients found•A model with mixed diffusion paths was used to interpret the results
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ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2015.04.069