Fe-Co fine particles with high Co content were prepared by reducing Co-substituted iron oxide particles. The saturation magnetization of the particles increased with Co concentration. The saturation magnetization was 153.8 emu/g with 15.0 wt.% Co content compared to 133.0 emu/g for iron particles with the same surface area. The Fe-Co particles showed superior corrosion resistance compared to iron particles. A Co-ferrite layer formed on the surface of the particles helped minimize the progress of the oxidation.>
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Kishimoto et al. (1991) studied this question.
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