Murata Manufacturing Co., Ltd.

Akiko Sato

Akihiro Nakamura

Yoichi Nakatsuji

In an open magnetic circuit type laminated coil component having a laminate formed by laminating a magnetic layer and a non-magnetic layer or a low magnetic permeability layer and a coil conductor disposed in the laminate, a zirconium oxide is included in the non-magnetic layer or the low magnetic permeability layer forming the laminate. The content of the zirconium oxide in the low magnetic permeability layer is in the range of about 0.02 wt % to about 1.0 wt %. A zirconium oxide is also included in the magnetic layer in a proportion of less than about 1.0 wt %. As the magnetic layer, a material including Ni&#x2014;Cu&#x2014;Zn ferrite as a main component is preferably used. As the non-magnetic layer or the low magnetic permeability layer, a material including Cu&#x2014;Zn ferrite as a main component is preferably used.

Laminated coil component

An open magnetic circuit multilayer coil component includes a laminate with magnetic layers, a coil, and a nonmagnetic layer provided within the laminate so as to cross a magnetic path formed by energization of the coil. A nonmagnetic material constituting the nonmagnetic layer is a Zn&#x2014;Cu-based ferrite nonmagnetic material, and a magnetic material constituting the magnetic layer is a magnetic material containing 100 parts by weight of an Ni&#x2014;Zn&#x2014;Cu-based magnetic ferrite material and 0.1 to 2.0 parts by weight, in terms of CoO, of Co added to the Ni&#x2014;Zn&#x2014;Cu-based magnetic ferrite material.

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Yasu, Japan

Akiko Sato