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Study of reorientation processes in L10-ordered FePt thin films.

M Rennhofer1, M Kozlowski2, B Laenens3

  • 1Dynamics of Condensed Systems, Faculty of Physics, University of Vienna, Strudlhofgasse 4, A-1090 Wien, Austria.

Intermetallics
|April 19, 2016
PubMed
Summary

Annealing L10 FePt thin films develops magnetic order. A modified Johnson-Mehl-Avrami model explains domain reorientation dynamics, revealing distinct 2D and 3D growth stages with specific activation energies.

Keywords:
A. Magnetic intermetallicsB. Order/disorder transformationsC. Thin filmsF. Spectroscopic methodsG. Magnetic applications

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Epitaxially grown L10 FePt thin films are crucial for magnetic storage applications.
  • Understanding the development of structural and magnetic order during annealing is key to optimizing film properties.

Purpose of the Study:

  • To investigate the evolution of magnetic anisotropy and domain structure in L10 FePt thin films during annealing.
  • To model the kinetics of magnetic domain reorientation using an adapted Johnson-Mehl-Avrami approach.

Main Methods:

  • Conversion electron Mössbauer spectroscopy (CEMS) to study magnetic order.
  • Monte Carlo simulations to corroborate experimental findings.
  • Application of a modified Johnson-Mehl-Avrami (JMA) model to analyze annealing kinetics.

Main Results:

  • Annealing induces a transition of the easy magnetization axis from out-of-plane to in-plane.
  • Domain reorientation shows an initial increase followed by a decrease before saturation.
  • The annealing process is characterized by two distinct dynamical processes: initial 2D-growth and later 3D-growth.

Conclusions:

  • The study successfully describes the complex domain reorientation dynamics in FePt films using a modified JMA model.
  • Activation energies for disordering (1.5(1) eV) and ordering (0.8(2) eV) were determined, providing insights into the underlying atomic mechanisms.