低温(25-80℃)フェライトめっきによるスピネル型((Fe, M)_3O_4, M=Fe, Co, Ni, and Zn) 磁性膜の作製

概要

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Spinel-type (Fe_<3-x>M_xO_4, M=Fe, Co, Ni, and Zn) polycrystalline films were synthesized by ferrite plating at 25, 50, and 800℃ from an aqueous solution of FeCl_1+MCl_2 mixed with an oxidizing solution of NaNO_2+CH_3COONH_4 + NH_3. For magnetite (Fe_3O_4), as the temperature was decreased from 80℃ to 25℃, the pH of the reaction solution to obtain single-phase Fe_3O_4 liner cased from 6.8 to 8.4 and the maximum rate of film deposition decreased from 13.3 nm/min to 2.3 nm/min. For Fe_<3-x>M_xO_4, as the temperature was decreased from 90℃ to 25℃, the ratio [x in film] / [x in reaction solution] increased from M=Co and Ni, while decreasing for M=Zn. This is explained by the dependence of the adsorption rate of M ions on the pH, which changes as the temperature changes. All the films had saturation magnetizations that compared favorably with those of bulk samples.
社団法人日本磁気学会の論文
2001-04-15