A coil component includes a magnetic portion that includes metal particles and a resin material, a coil conductor embedded in the magnetic portion and having a core portion, and outer electrodes electrically connected to the coil conductor. The magnetic portion includes a magnetic outer coating and a magnetic base having a protrusion portion. The coil conductor is disposed on the magnetic base such that the protrusion portion is located in the core portion. The magnetic outer coating is disposed so as to cover the coil conductor, and the bottom surface of the magnetic base includes a recessed portion in an area opposite to the protrusion portion.

A plurality of flaky magnetic metal particles have an average thickness of 10 nm to 100 ?m, each of the particles having a flat surface; a magnetic metal phase containing at least one element selected from the group consisting of Fe, Co, and Ni; and a difference in coercivity on the basis of direction within the surface, the average value of the ratio of the average length within the surface with respect to the thickness being from 5-10,000. The particles include a particle having at least one of a crack in a thickness direction having a depth equivalent to 10% or more of the thickness of the particle and a width shorter than the depth, and a crack in a direction parallel to the surface having a length equivalent to 10% or more of the thickness of the particle and a width shorter than the length.

Mixed magnetic powders for making a magnetic core or body is disclosed, wherein the mixed magnetic powders comprises a first magnetic powder and a second magnetic powder, each of the first magnetic powder and the second magnetic powder being made of a soft magnetic material, wherein the average particle diameter of the first magnetic powder is greater than that of the second magnetic powder, and each of the first magnetic powder and the second magnetic powder has a pre-configured particle size distribution for increasing the density of the magnetic body.

A powder magnetic core containing a magnetic particle of an Fe-based Cr-containing amorphous alloy and an organic binding substance is provided as a powder magnetic core with a small loss and high initial permeability. The depth profile of the composition determined from the surface of the magnetic particle in the powder magnetic core has the following characteristics. (1) An oxygen-containing region with an O/Fe ratio of 0.1 or more can be defined from the surface of the magnetic particle, and the oxygen-containing region has a depth of 35 nm or less from the surface. (2) A carbon-containing region with a C/O ratio of 1 or more can be defined from the surface of the magnetic particle, and the carbon-containing region has a depth of 5 nm or less from the surface. (3) The oxygen-containing region has a Cr-concentrated portion with a bulk Cr ratio of more than 1.

A magnetic core according to one embodiment of the present invention includes a material formed of iron (Fe)-silicon (Si)-boron (B), wherein a mass percentage of Fe in a first surface, which is an upper surface, is different from a mass percentage of Fe in a second surface which is a side surface, and a ratio of the mass percentage of Fe in the first surface to a difference between the mass percentage of Fe in the first surface and the mass percentage of Fe in the second surface is in the range of 6 to 21.

Provided is a method of manufacturing a soft magnetic dust core. The method includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature T.sub.x1 and a second initial crystallization temperature T.sub.x2; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T.sub.x1?100 K; and heating to a maximum end-point temperature equal to or higher than T.sub.x1?50 K and lower than T.sub.x2 with the compacting pressure being applied.

Mixed magnetic powders for making a magnetic core or body is disclosed, wherein the mixed magnetic powders comprises a first magnetic powder and a second magnetic powder, each of the first magnetic powder and the second magnetic powder being made of a soft magnetic material, wherein the average particle diameter of the first magnetic powder is greater than that of the second magnetic powder, and each of the first magnetic powder and the second magnetic powder has a pre-configured particle size distribution for increasing the density of the magnetic body.

A coil component includes a magnetic portion that includes metal particles and a resin material, a coil conductor embedded in the magnetic portion and having a core portion, and outer electrodes electrically connected to the coil conductor. The magnetic portion includes a magnetic outer coating and a magnetic base having a protrusion portion. The coil conductor is disposed on the magnetic base such that the protrusion portion is located in the core portion. The magnetic outer coating is disposed so as to cover the coil conductor, and the bottom surface of the magnetic base includes a recessed portion in an area opposite to the protrusion portion.

The present invention relates to a composition for bonded magnets having good hot water resistance and a method of manufacturing the composition. The method of manufacturing a composition for bonded magnets includes: obtaining a first kneaded mixture by kneading a rare earth-iron-nitrogen-based magnetic powder and an acid-modified polypropylene resin; and obtaining a second kneaded mixture by kneading the first kneaded mixture with a polypropylene resin and an amorphous resin having a glass transition temperature of 120 C. or higher and 250 C. or lower, wherein, with respect to 100 parts by weight of the rare earth-iron-nitrogen-based magnetic powder, the amount of the acid-modified polypropylene resin is 3.5 parts by weight or greater and less than 10.4 parts by weight, and the total amount of the polypropylene resin and the amorphous resin is 0.35 part by weight or greater and less than 3.88 parts by weight.

In an embodiment, a magneto-dielectric material comprises a polymer matrix; a plurality of hexaferrite microfibers; wherein the magneto-dielectric material has a permeability of 2.5 to 7, or 2.5 to 5 in an x-direction parallel to a broad surface of the magneto-dielectric material and a magnetic loss tangent of less than or equal to 0.03; as determined at 1 GHz, or 1 to 2 GHz.