作者: D. Babonneau , J. Briatico , F. Petroff , T. Cabioc’h , A. Naudon
DOI: 10.1063/1.372363
关键词: Crystallography 、 Coercivity 、 Magnetic nanoparticles 、 Superparamagnetism 、 Annealing (metallurgy) 、 Materials science 、 Microstructure 、 Magnetic susceptibility 、 Magnetization 、 Extended X-ray absorption fine structure 、 Analytical 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...