Preparation, structure and magnetic properties of the nanostructural Ni@C films obtained by magnetron deposition

Three series of films were obtained by magnetron sputtering of the composite C-Ni target with different ratios C/Ni (vol.%)= 60/40; 40/60; 30/70.The effect of the substrate temperature on the structure and the size of film-forming nickel nanocrystallites with a carbon shell was studied with using X-ray diffraction analysis.The cluster nature of film deposition on the growth surface was established by using atomic force microscopy.The saturation magnetization of nickel nanoparticles 4πMS was measured by the inductive-frequency method and the substrate temperature dependence was studied.It has been shown that the films with a high carbon content exhibit magnetism only when deposited on hot substrates.The films with the minimum carbon concentration exhibit ferromagnetic behavior even when deposited on a relatively cold substrate.