Grain boundary diffusion induced reaction layer formation in Fe/Pt thin films
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The solid-state reaction in Pt(15 nm)/Fe(15 nm) and Pt(15 nm)/Ag(10 nm)/Fe(15 nm) thin films after post-annealing at 593 K and 613 K for different annealing times has been studied. The structural properties of these samples were investigated by various methods including depth profiling with secondary neutral mass spectrometry, transmission electron microscopy, and X-ray diffraction. It is shown that after annealing at the above temperatures where the bulk diffusion processes are still frozen, homogeneous reaction layers of FePt and FePt with about 10 at.% Ag, respectively, have been formed. Corresponding depth profiles of the element concentrations revealed strong evidence that the formation mechanism is based on a grain boundary diffusion induced solid-state reaction in which the reaction interfaces sweep perpendicularly to the original grain boundary. Interestingly, X-ray diffraction indicated that in both thin-film systems after the solid-state reaction the ordered L10 FePt phase, which is the requested phase for future magnetic data storage applications, is also present.
KeywordsReaction Layer FePt Longe Annealing Time FePt Film Alloyed Zone
The authors gratefully acknowledge the support of the Hungarian Scientific Research Fund (OTKA) through Grant CK 80126 and by the TÁMOP-4.2.2.A-11/1/KONV-2012-0036 projects. These projects are implemented through the New Hungary Development Plan co-financed by the European Social Fund and the European Regional Development Fund. This research was also supported by the European Union and the State of Hungary, co-financed by the European Social Fund in the framework of the TÁMOP 4.2.4. A/2-11-1-2012-0001 ‘National Excellence Program’ (author G.L. Katona). Support from the Hungarian–Chinese bilateral project, TÉT_12_CN-1-2012-0036, is also acknowledged.
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