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

Rafal Kozubski, Miroslaw Kozlowski, Kings Zapala, Veronique Pierron-Bohnes, Wolfgang Pfeiler, Marcus Rennhofer, Bogdan Sepiol, Gero Vogl

    Veröffentlichungen: Beitrag in FachzeitschriftMeeting Abstract/Conference Paper

    Abstract

    "Order-order" kinetics was studied by means of in situ and quasi-residual resistometry in bulk polycrystal stoichiometric L1 0-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. ΠASM International.
    OriginalspracheEnglisch
    Seiten (von - bis)482-486
    Seitenumfang5
    FachzeitschriftJournal of Phase Equilibria and Diffusion
    Jahrgang26
    Ausgabenummer5
    DOIs
    PublikationsstatusVeröffentlicht - 2005

    ÖFOS 2012

    • 1030 Physik, Astronomie

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