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Atomic ordering kinetics of FePt thin films.

X H Li1, B T Liu, H Y Sun

  • 1State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P. R. China.

Journal of Nanoscience and Nanotechnology
|May 16, 2009
PubMed
Summary

This study investigated FePt thin films, finding that a low nucleation energy and high growth energy explain their high ordering temperature, crucial for magnetic recording media.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • FePt thin films are vital for advanced magnetic recording media due to their magnetic properties.
  • Understanding the formation of L1(0) ordered domains is key to optimizing FePt performance.
  • Kinetics of domain formation influence the ordering temperature and material stability.

Purpose of the Study:

  • To investigate the nucleation and growth kinetics of L1(0) ordered domains in FePt thin films.
  • To determine the activation energies for nucleation (En) and growth (Eg) of these domains.
  • To correlate kinetic parameters with the observed high ordering temperature in FePt films.

Main Methods:

  • Utilized X-ray diffraction (XRD) for structural analysis.
  • Employed transmission electron microscopy (TEM) for high-resolution imaging.

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  • Combined XRD and TEM data to analyze domain formation and kinetics.

    • Main Results:

    • Determined a small nucleation activation energy (En) of (0.5 +/- 0.1) eV.
    • Determined a relatively large growth activation energy (Eg) of (0.9 +/- 0.1) eV.
    • Observed a high ratio of Eg/En > 1, indicating growth-limited ordering.

    Conclusions:

    • The determined activation energies provide insight into the FePt ordering mechanism.
    • The high Eg/En ratio explains the high L1(0) ordering temperature.
    • These findings are critical for the development of high-performance magnetic recording media.