Effects of annealing time on the structural and magnetic properties of L10 FePt thin films
Autor: | Alan Savan, Nikolay Zotov, Alfred Ludwig, R. Hiergeist |
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Rok vydání: | 2010 |
Předmět: |
Diffraction
Materials science Condensed matter physics Annealing (metallurgy) Magnetization reversal Metals and Alloys Surfaces and Interfaces Coercivity Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystallography Magnetization Remanence Materials Chemistry Thin film |
Zdroj: | Thin Solid Films. 518:4977-4985 |
ISSN: | 0040-6090 |
Popis: | Thermal annealing of [Fe 1.65 nm/Pt 1.84 nm] 50 multilayers at 673 K for various annealing times between 60 and 12000 s leads to the direct formation of the fully ordered L1 0 FePt phase with (111) texture. The average grain sizes, determined from X-ray diffraction size–strain analysis, are smaller than the critical size for multi-domain FePt particles, suggesting the presence of single-domain (SD) grains. The coercivity increases with annealing time and increasing grain size and reaches values of about 955 kA/m. The remanence values are typical for randomly oriented weakly-interacting particles. A decrease of the remanence with annealing time suggests a decrease of the intergrain exchange interactions with annealing time. Analysis of minor loops and the initial magnetization curves shows the presence of a broad distribution of critical fields, which the individual SD particles have to overcome for the magnetization reversal. |
Databáze: | OpenAIRE |
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