Laminated coil component

摘要

A laminated coil component includes a magnetic body part made of a Ni—Zn-based ferrite material and a coil conductor containing Cu as a main component, which is wound into a coil shape, and the coil conductor is embedded in the magnetic body part to form a component base. The component base is divided into a first region near the coil conductor and a second region other than the first region. The grain size ratio of the average crystal grain size of the magnetic body part in the first region to the average crystal grain size of the magnetic body part in the second region is 0.85 or less. The molar content of CuO in the ferrite raw material is set to 6 mol % or less, and firing is performed in a reducing atmosphere in which the oxygen partial pressure is an equilibrium oxygen partial pressure of Cu—Cu2O or less.

主权项

1. A laminated coil component comprising:
a magnetic body part made of a ferrite material; and a conductor part, the conductor part including a portion wound into a coil shape, the conductor part being embedded in the magnetic body part to form a component base, and the conductor part including an extraction part that leads out from the coil-shaped portion and leads to an external electrode, wherein the component base is divided into a first region near the conductor part and a second region entirely spaced from the coil-shaped portion, the second region extending along a central axis of the coil-shaped portion in an axial direction of the coil-shaped portion including plural complete turns of the conductor part in the coil-shaped portion, a line perpendicular to the central axis of the coil shape passes through the first region and the second region, the grain size ratio of the average crystal grain size of the magnetic body part in the first region to the average crystal grain size of the magnetic body part in the second region is 0.85 or less and great than 0, and the conductor part contains Cu as a main component.