Time-temperature-transformation diagrams for the A1 to L1 phase transformation in FePt and FeCuPt thin films

The kinetics of the A1 to L10 transformation are given in the form of time-temperature-transformation diagrams. These diagrams are calculated using experimentally measured data for 1μm thick FePt and FeCuPt thin films and three variations of the Johnson-Mehl-Avrami-Kolmogorov kinetic theory. For the...

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Bibliographic Details
Published in:Journal of applied physics 2007-01, Vol.101 (1)
Main Authors: Berry, D. C., Barmak, K.
Format: Article
Language:English
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Summary:The kinetics of the A1 to L10 transformation are given in the form of time-temperature-transformation diagrams. These diagrams are calculated using experimentally measured data for 1μm thick FePt and FeCuPt thin films and three variations of the Johnson-Mehl-Avrami-Kolmogorov kinetic theory. For the FePt alloys, an increase in Pt content from 45.6 to 52.5 at.% results in a >300 times increase in the annealing time needed to reach a fraction transformed of 0.95 at 300°C. Extension of the calculations for 1μm thick films to 10nm thick films using geometric corrections shows not only that thinner films result in slower kinetics for all temperatures, but also that film composition has a significant impact on the transformation behavior. Transformation in nanoparticles is highly dependent on the nucleation of the L10 phase.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2403835