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AssigneeFuji Photo Film Co., Ltd.
InventorsYasushi Hattori, Koukichi Waki, Keizo Ogawa
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The present invention relates to a method of producing a magnetic particle including forming a layer containing an alloy particle that can form a CuAu-type or Cu3Au-type hard magnetic ordered alloy phase on a support, oxidizing the layer, and annealing the layer in a non-oxidizing atmosphere. The invention also relates to a method of producing a magnetic particle including producing an alloy particle that can form a hard magnetic ordered alloy phase, oxidizing the alloy particle, and annealing the particle in a non-oxidizing atmosphere, and a magnetic particle produced by the foregoing production method. Further, the invention relates to a magnetic recording medium comprising a magnetic layer containing a magnetic particle and a method of producing a magnetic recording medium including forming a layer containing an alloy that can form the foregoing hard magnetic ordered alloy phase, oxidizing the layer, and annealing the layer in a non-oxidizing atmosphere.
A magnetic particle produced by a method including producing in liquid an alloy particle that can form a CuAu-type or Cu3Au-type hard magnetic ordered alloy phase, oxidizing the alloy particle with an oxygen-containing gas, and annealing the oxidized particle in a non-oxidizing atmosphere, wherein the magnetic particle has a particle size of 3 to 10 nm, and a variation coefficient of the particle size is less than 10%.
Dependencies are inferred from the claim text.