Taiyo Yuden Co., Ltd.

Norihiro Asako

Tomomi Kobayashi

Kenji Yazawa

Makoto Aoki

When manufacturing a magnetic body which is made of a ferrite material containing Fe, Ni, and Zn, and whose Mn content is 0.1288 percent by mass or higher, or a magnetic body which is made of a ferrite material containing Fe, Ni, Zn, and Cu, and whose Mn content is 0.1178 percent by mass or higher, an iron oxide powder whose Mn content is 0.20 percent by mass or higher is used as a raw material powder.

Method for manufacturing magnetic body and coil component containing magnetic body

When manufacturing a magnetic body whose primary component is Ni&#x2014;Zn ferrite, an iron oxide powder whose Mn content is 0.20 to 0.85 percent by mass is used as a raw material powder, or, in addition to using an iron oxide powder whose Mn content is 0.20 percent by mass or higher as a raw material powder, a mol ratio of Ni to Zn (Ni/Zn) in the ferrite material is determined based on the Mn content in the iron oxide powder and the raw material powders are compounded in such a way that the mol ratio is achieved. The magnetic body does not contain any additives as essential components other than the primary components of the Ni&#x2014;Zn ferrite material. A coil component using the magnetic body has excellent direct-current superimposition property and magnetic permeability.

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Takasaki, Japan

Norihiro Asako