The present article describes CoxFe3−xO4 films, which were fabricated at 90 °C by the ferrite-plating method and have the excellent perpendicular magnetic anisotropy and the perpendicular coercivity Hc⊥ above 2 kOe. The films were composed of Co ferrite and Fe3O4 grains. The highest Hc⊥ reached 3 kOe at the composition of Co0.43Fe2.57O4 and the saturation magnetization Ms was 500–550 emu/cc. Hc⊥ was over 2 kOe even for a film thickness of 35 nm without any underlayers. ΔM⊥ evaluation that is measured in the perpendicular direction to the film plane showed that the interactions in the films supported the magnetized state, stabilizing the direct current remanent state. The Mössbauer analyses revealed that the Co0.43Fe2.57O4 films have excellent perpendicular magnetic anisotropy and the magnetization direction inclined from the perpendicular axis due to the demagnetization field. This achievement will open the way to develop the high-density perpendicular recording media even when plastic disks and sheets are used as substrates.
Abstract---A new type of automatic, hypochlorous acid sensor is proposed which is simple in structure, low in price, and easy for maintenance, using no electrolytes or membrane. Sample water is contained in two cells, in one of which HOCI is catalytically decomposed by fine Ni powders that are dispersed by a magnetic stirrer. We measure difference between Au electrode potential of the decomposed water and that of undecomposed water, which corresponds to the output potential of "concentration cell" of HOCI aqueous solution. A prototype sensor gave output of 30mv, against 20ppm HOCI water, with measuring time of 5min. We found that Ni powders (48 nm in average diameter) exhibit stronger HOCI-decomposition catalytic activity than y-Fe 2 0 3 powders (23nm), and that it is not Ni metal but rather the oxidized NiO surface layer which plays a dominant role in the catalytic decomposition of HOC I.
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