Nickel Ferrite Thick Films Deposited by Vacuum-Arc Discharge

概要

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Stoichiometric nickel ferrite films 10〜100μ thick have been prepared by an arc evaporation in a vacuum of 10^<-4> torr of the material sintered with the starting mixture (Ni0)_<0.62>(Fe_2O_3)_<0.38>, and subsequent heat treatment in air at 1250〜1350℃. They have a saturation magnetization value σ_s of 51 gauss・cm^3/g agreed with the value for the bulk nickel ferrite. Their X-ray diffraction patterns and Mossbauer absorption spectra indicate that they may be composed of the polycrystalline particles with a homogeneous ion distribution and an inversed spinel structure. However, the as-deposited film is composed of the spinel, rock-salt and nickel types of small crystalline particles and the fine amorphous particles, and has σ_s of 17 gauss・cm^3/g. Since each component ion is distributed inhomogeneously in the particles, the heat treatment below 1200℃ oxidizes them in different ways. Consequently, the structure and σ_s of the film has a complex dependence on the heating temperature.
社団法人応用物理学会の論文
1970-03-05