Title: Self-diffusion of iron in L1(0)-ordered FePt thin films
Authors: Rennhofer, M ×
Sepiol, B
Sladecek, M
Kmiec, D
Stankov, S
Vogl, G
Kozlowski, M
Kozubski, R
Vantomme, André
Meersschaut, Johannes
Ruffer, R
Gupta, A #
Issue Date: Sep-2006
Publisher: American physical soc
Series Title: Physical Review B vol:74 issue:10 pages:1-8
Article number: 104301
Abstract: Diffusion of iron atoms in a thin FePt film of L1(0) structure was investigated in the low temperature region where iron diffusivities are between 10(-22) m(2) s(-1) and 10(-24) m(2) s(-1). A new method using nuclear resonant scattering of synchrotron radiation in grazing incidence geometry was used, providing higher accuracy and sensitivity than the conventional tracer methods. Isotopical FePt multilayer samples Pt(20 A)/[(FePt)-Fe-57(20 A)/FePt(30 A)](10)/MgO(001) produced by molecular beam epitaxy were annealed at four temperatures between 773 and 873 K for times between 60 and 120 min. The nuclear reflectivity was measured at room temperature after each annealing step and the decrease of the nuclear superstructure Bragg-peak intensities was observed. From the intensity loss, the diffusion coefficient and the activation energy for iron self-diffusion in the FePt thin film along the c axis were determined as D-0=(3.45 +/- 0.44)x10(-13) m(2) s(-1) and Q=(1.65 +/- 0.29) eV. The value for the activation energy is the same as found by residual resistivity measurements in the same system.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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