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Atomic migration on ordering and diffusion in bulk and nanostructured FePt intermetallic

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Abstract

“Order-order” kinetics was studied by means of in situ and quasi-residual resistometry in bulk polycrystal stoichiometric L10-ordered FePt and in epitaxially deposited FePt thin film. In addition, Fe diffusion in FePt thin film was examined by means of a combination of nuclear resonant scattering and nuclear tracer techniques. In bulk FePt, a discontinuous drop of the activation energy for chemical ordering (from 2.7–15 eV) was detected below 850 K, definitely away from the Curie point (735 K). The activation energy for Fe radiotracer diffusion in the FePt thin film studied below 900 K was found to be equal to 1.7 eV (in view of the value higher than 3 eV measured above 1100 K). Kinetic Monte Carlo simulations of order-order processes in bulk and nanolayered FePt reproduced their experimentally observed multi-time-scale character. In simulated FePt nanolayers, a reorientation of the initial z-variant L10 superstructure into a mixture of x and y variants was definitely a dominating process.

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Authors and Affiliations

  1. M. Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, 30-059, Kraków, Poland

    Rafal Kozubski, Miroslaw Kozlowski & Kinga Zapala

  2. Institut de Physique et Chimie des Matériaux de Strasbourg, 23, Rue du Loess, BP43, 67034, Strasbourg Cedex 2, France

    Veronique Pierron-Bohnes

  3. Institut für Materialphysik, Universität Wien, Strudlhofgasse 4, 1090, Wien, Austria

    Wolfgang Pfeiler, Marcus Rennhofer, Bogdan Sepiol & Gero Vogl

Authors
  1. Rafal Kozubski
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  2. Miroslaw Kozlowski
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  3. Kinga Zapala
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  4. Veronique Pierron-Bohnes
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  5. Wolfgang Pfeiler
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  6. Marcus Rennhofer
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  7. Bogdan Sepiol
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  8. Gero Vogl
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Additional information

This article is a revised version of the paper printed in the Proceedings of the First International Conference on Diffusion in Solids and Liquids—DSL-2005, Aveiro, Portugal, July 6–8, 2005, Andreas Öchsner, José Grácio and Frédéric Barlat, eds., University of Aveiro, 2005.

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Kozubski, R., Kozlowski, M., Zapala, K. et al. Atomic migration on ordering and diffusion in bulk and nanostructured FePt intermetallic. J Phs Eqil and Diff 26, 482–486 (2005). https://doi.org/10.1007/s11669-005-0039-y

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  • DOI: https://doi.org/10.1007/s11669-005-0039-y

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