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Fe tracer diffusion in L10 ordered FePt

Published online by Cambridge University Press:  11 February 2011

Y. Nosé,
T. Ikeda,
H. Nakajima,
K. Tanaka and
H. Numakura
Y. Nosé
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8–1, Ibaraki, Osaka 567–0047, Japan
T. Ikeda
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8–1, Ibaraki, Osaka 567–0047, Japan
H. Nakajima
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8–1, Ibaraki, Osaka 567–0047, Japan
K. Tanaka
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606–8501, Japan
H. Numakura
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606–8501, Japan
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Abstract

Tracer diffusion coefficient of 59Fe in FePt with the tetragonal L10 ordered structure has been measured by an ion-beam sputter-sectioning technique in the temperature range from 1173 to 1374 K. Anisotropy in diffusion has been studied using single-variant single-crystal specimens. The diffusion coefficient in the direction perpendicular to [001] axis (in the a-axis direction), D a, is larger than that in the [001] (c-axis) direction, Dc, as expected from the atomic arrangement of the L10 ordered structure. The ratio of the diffusion coefficients, D a/D c, is 1.33.6 for Fe42Pt58 and smaller at higher temperatures. The activation energy for the diffusion is 259 ± 1 kJ/mol for D a and 309 ± 18 kJ/mol for Dc, while the pre-exponential factor is and , respectively in Fe42Pt58.

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References

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