Kanto Denka Kogyo Co., Ltd.

Shintaro Suzuki

Yoshimi Moriya

Sadao Iizuka

Yuichi Omote

Katsuhiro Takano

Yoshishige Koma

Masaru Hagiwara

Ferromagnetic Fe-Ni alloy powders having the combination of a coercive force of 550-900 Oe (oersted) and a saturation flux density of 90-170 emu/g are provided by applying a nickel compound in a liquid to a particulate, oxygen-containing iron compound having an average particle length of 0.5-5 .mu.m and an average particle width of 0.02-0.5 .mu.m, and then drying and reducing the treated material to produce a metallic powder. The ferromagnetic powders are suitable for production of magnetic recording media because of the balanced magnetic properties.

Ferromagnetic metallic powders useful for magnetic recording and

Acicular magnetic powder consisting essentially of acicular iron particles which have a high coercive force and a high saturation flux density. These particles are doped and additionally contain at least one metal selected from the group consisting of cobalt, nickel, manganese and antimony and are produced in accordance with a process which provides finely divided acicular iron particle products.

Production of magnetic powder

The magnetic characteristics of magnetic powder consisting mainly of iron are improved by pre-treating the starting material from which the magnetic powder is prepared by reduction, with an aqueous solution and/or suspension of one member selected from the group consisting of cobalt, nickel, manganese and antimony compounds and mixtures thereof.

The magnetic characteristics of magnetic powder consisting mainly of iron are improved by pre-treating the starting material from which the magnetic powder is prepared by reductions, with an aqueous solution and/or suspension of one member selected from the group consisting of zinc, chromium and copper compounds and mixtures thereof.

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Shibukawa, Japan

Shintaro Suzuki