Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 4: Thin Film Characterisation II: Structure Analysis and Composition
DS 4.4: Vortrag
Montag, 16. März 2015, 15:45–16:00, H 0111
Diffusion controlled solid state reactions in Fe/Pt thin-film systems with additional Ag layer — •Nataliia Safonova1, Gabor Katona2, Fabian Ganss3, Dmitriy Mitin1, Iuriy Makogon4, Gunter Beddies1,3, Dezso Beke2, and Manfred Albrecht1 — 1Institute of Physics, University of Augsburg, Germany — 2University of Debrecen, Hungary — 3Chemnitz University of Technology, Germany — 4National Technical University of Ukraine "KPI", Kyiv, Ukraine
Fe(15 nm)/Ag(10 nm)/Pt(15 nm)/Si2(100 nm)/Si(100) and FePt(15 nm)/Ag(7.5 nm)/SiO2(100 nm)/Si(100) thin film systems were prepared by magnetron deposition at room temperature. Rapid thermal annealing (RTA) for 30s was performed between 600oC and 900oC. In addition samples also were isothermally annealed between 245oC and 390oC (from 0.5 to 52 hours). Composition profiles of trilayer samples (obtained by secondary neutral mass spectrometry) after the low and high temperature heat treatments show a strong intermixing between Ag and Pt, resulting in the formation of AgxPt1−x. Afterwards Pt diffuses through the remaining Ag layer and penetrates into the Fe grain boundaries (GBs) reducing the amount of Pt in the AgxPt1−x layer. This process leads to the formation of a FePt reaction product and Ag appears to ,,move,, towards the substrate. High temperature RTA on the same samples give similar composition distributions and eventually the formation of a homogeneous L10 ordered FePt alloy (observed by X-ray diffraction). Furthermore, corresponding magnetic properties will be discussed.