Structural and magnetic properties of Fex–C1−x nanocomposite thin films

作者: D. Babonneau , J. Briatico , F. Petroff , T. Cabioc’h , A. Naudon

DOI: 10.1063/1.372363

关键词: CrystallographyCoercivityMagnetic nanoparticlesSuperparamagnetismAnnealing (metallurgy)Materials scienceMicrostructureMagnetic susceptibilityMagnetizationExtended X-ray absorption fine structureAnalytical chemistry

摘要: Iron–carbon nanocomposite thin films with iron concentrations ranging from 12 to 74 at. % were grown by ion-beam sputtering codeposition at different substrate temperatures. The microstructure of the was characterized transmission electron microscopy, atomic force extended x-ray absorption fine structure, and grazing incidence small-angle scattering. A granular morphology consisting body-centered-cubic iron-rich nanoparticles (2–5 nm in diameter 3–8 height a relatively sharp size distribution) regularly distributed within more or less graphitic matrix obtained. Structural properties as well magnetic ones found depend strongly on composition, temperature, postdeposition treatments (annealing Ar+ irradiation). temperature dependence susceptibility exhibited superparamagnetic response blocking range 13–180 K. maximum low-temperature (5 K) coercivity value obtained this study 850 O...

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