Process for producing a magnetic material and magnetic recording medium containing the same
AssigneeFuji Photo Film Co., Ltd.
InventorsMasashi Aonuma, Yasuo Tamai
Life of this patent
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Abstract
A ferromagnetic material having a high coercive force and good squareness ratio prepared by mixing an aqueous solution at least containing a salt of a metal capable of forming a ferromagnetic material with a solution of a reducing agent containing at least one of a boron hydride compound or a derivative thereof to perform an oxidation-reduction reaction, wherein the mixing of the solutions is after adjusting the pH of the aqueous solution of the metal salt to about 3.0 or less, and the pH of the reaction mixture at the end of the reaction is adjusted to at least about 3.0 or higher.
Claims16
A process for preparing a ferromagnetic material which comprises mixing an aqueous solution containing at least a salt of Fe, Co, Fe-Co, Fe-Ni, Co-Ni and Fe-Co-Ni and whose pH has been adjusted to about 3.0 or less, with a solution of a reducing agent containing at least one boron hydride compound or a derivative thereof to perform an oxidation-reduction reaction, and adjusting the pH of the reaction mixture at the end of the reaction to at least about 3.0 or higher.
Dependencies are inferred from the claim text.