A ceramic core includes an axial core part extended in the longitudinal direction, and a pair of flanges located at both ends in the longitudinal direction of the axial core part and projecting around the periphery of the axial core part in the height and width directions. The ceramic core has a length dimension L in the longitudinal direction of about 0 mm<L≦1.1 mm. A ratio t/T of the thickness dimension t in the height direction of the axial core part to the height dimension T in the height dimension of the flanges, is about 0<t/T≦0.6. A ratio w/W of the width dimension w in the width direction of the axial core part to the width dimension W in the width direction of the flanges, is about 0<w/W≦0.6.

A ceramic core, which is made of a ferrite material including Ni and Zn, includes an axial core extending in a length direction and a pair of flange portions disposed at both ends of the axial core in the length direction. The dimension L of the ceramic core in the length direction satisfies 0 mm<L≦1.1 mm. The surface roughness of a ridge portion of the axial core is less than or equal to 2.5 μm.

A motor comprises a stator comprising at least one core; a coil wound on the at least one core of the stator; a rotor having a rotor pole and being rotatably mounted relative to the stator; and at least one magnet disposed between the rotor and the stator. The at least one core comprises a composite material defined by iron-containing particles having an alumina layer disposed thereon.

A coil component includes a support member, an internal coil supported by the support member and including a plurality of coil patterns, and external electrodes connected to the internal coil and including a first layer in contact with the internal coil and a second layer disposed on the first layer. The second layer is a composite layer including a conductive material and a resin. The support member includes first and second surfaces facing the external electrodes, respectively, and one or more of at least a portion of the first surface and at least a portion of the second surface are configured as cut surfaces.

A magnetic core has a structure in which Fe-based soft magnetic alloy particles are connected via a grain boundary. The Fe-based soft magnetic alloy particles contain Al, Cr and Si. An oxide layer containing at least Fe, Al, Cr and Si is formed at the grain boundary that connects the neighboring Fe-based soft magnetic alloy particles. The oxide layer contains an amount of Al larger than that in Fe-based soft magnetic alloy particles, and includes a first region in which the ratio of Al is higher than the ratio of each of Fe, Cr and Si to the sum of Fe, Cr, Al and Si, and a second region in which the ratio of Fe is higher than the ratio of each of Al, Cr and Si to the sum of Fe, Cr, Al and Si. The first region is on the Fe-based soft magnetic alloy particle side.

A powder core includes: a powder of a crystalline magnetic material; and a powder of an amorphous magnetic material, in which a median diameter D50A of the powder of the amorphous magnetic material is 15 μm or less, and satisfies the expression: 1≦D50A/D50C≦3.5 with respect to a median diameter D50C of the powder of the crystalline magnetic material.

The present invention provides a magnetic core having insulating properties, and a method for manufacturing the magnetic core. Provided is a magnetic core manufactured by compression molding and subsequent thermal curing of an iron-based soft magnetic powder having a resin coating formed on particle surfaces thereof. The iron-based soft magnetic powder is one in which the particle surfaces have been coated with an inorganic insulator; the resin coating is an uncured resin coating formed by dry blending the powder with a thermosetting resin at a temperature equal to or greater than the softening point of the thermosetting resin and lower than the thermal curing initiation temperature of the resin; the compression molding is carried out by using a mold to produce a compression molded body; and the thermal curing is carried out at a temperature equal to or greater than the thermal curing initiation temperature of the thermosetting resin.

A coil electronic component includes a body and external terminals. The body includes a winding coil part and a pillar-shaped core part inserted inside of the winding coil part and formed of a magnetic metal. The external terminals are connected to the winding coil part and disposed on an external surface of the body. The body contains the magnetic metal and a resin, and the pillar-shaped core part has magnetic permeability higher than that of a portion of the body disposed outside of the winding coil part.

The present invention relates to a soft magnetic metal powder which has Fe as the main component and contains Si and B, wherein, the content of Si in the soft magnetic metal powder is 1 to 15 mass %, the content of boron inside the metal particle of the soft magnetic metal powder is 10 to 150 ppm, and the particle has a film of boron nitride on the surface. The present invention also relates to a soft magnetic metal powder core prepared by using the soft magnetic metal powder.

An amorphous soft magnetic alloy of the formula (Fe.sub.1-αTM.sub.α).sub.100-w-x-y-zP.sub.wB.sub.xL.sub.ySi.sub.z Ti.sub.pC.sub.qMn.sub.rCu.sub.s, wherein TM is Co or Ni; L is Al, Cr, Zr, Mo or Nb; 0≦α≦0.3, 2≦w≦18 at %, 2≦x≦18 at %, 15≦w+x≦23 at %, 1<y≦5 at %, 0≦z≦4 at %; p, q, r, and s represents an addition ratio such that the total mass of Fe, TM, P, B, L and Si is 100, and 0≦p≦0.3, 0≦q≦0.5, 0≦r≦2, 0≦s≦1 and r+s>0; the composition fulfills one of the following conditions: L is Cr, Zr, Mo or Nb; or L is a combination of Al and Cr, Zr, Mo or Nb, wherein 0<Al≦5 at %, 1≦Cr≦4 at %, 0<Zr≦5 at %, 2≦Mo≦5 at %, and 2≦Nb≦5 at %; the alloy has a crystallization start temperature (Tx) which is 550° C. or less, a glass transition temperature (Tg) which is 520° C. or less, and a supercooled liquid region represented by ΔTx=Tx−Tg, which is 20° C. or more.