A metal magnetic particle provided with an oxide layer on a surface of an alloy particle containing Fe and Si. The oxide layer has a first oxide layer, a second oxide layer, and a third oxide layer from a side of the alloy particle. All of the first oxide layer, the second oxide layer, and the third oxide layer contain Si. Also, in line analysis of element content by using a scanning transmission electron microscope-energy dispersive X-ray spectroscopy, the first oxide layer is a layer having Fe content smaller than Si content in the alloy particle, the second oxide layer is a layer having Fe content larger than the Si content in the alloy particle, and the third oxide layer is a layer having Fe content smaller than the Si content in the alloy particle.

A coil component includes: a substrate body containing metal magnetic grains whose primary component is iron and which contains silicon and a metal that oxidizes more easily than iron, and an oxide layer covering the surfaces of the metal magnetic grains and joining multiple numbers of the metal magnetic grains together; a coil conductor provided in the substrate body; external electrodes provided on the surface of the substrate body and electrically connected to the coil conductor; and a bonding part positioned between the metal magnetic grains and the external electrodes, wherein the concentration of iron decreases in a substantially continuous manner from the metal magnetic grains to the external electrodes. The external electrodes can have improved joining strength.

Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Mn-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an α-(Fe, Mn) phase and a Mn-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.

Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Mn-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an α-(Fe, Mn) phase and a Mn-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.

A dust core includes a metal magnetic material, a resin, and an insulation film. The insulation film contacts with a surface of the metal magnetic material and covers the metal magnetic material. The insulation film includes a first film and a second film. The first film contacts with the surface of the metal magnetic material. The second film contacts with a surface of the first film. A density of the first film is higher than a density of the second film.

A dust core includes a metal magnetic material, a resin, and an insulation film. The insulation film contacts with a surface of the metal magnetic material and covers the metal magnetic material. The insulation film includes a first film and a second film. The first film contacts with the surface of the metal magnetic material. The second film contacts with a surface of the first film. A density of the first film is higher than a density of the second film.

An insulating material coated soft magnetic powder, which is a powder body of an insulating material coated soft magnetic particle 1, includes: a core particle 2 including a base portion 2a that includes a soft magnetic material, and an oxide film 2b that is provided on a surface of the base portion 2a and contains an oxide of an element contained in the soft magnetic material, and an insulating film 3b in which a plurality of insulating nanoparticles 3a are attached to the core particle 2. A particle size of each nanoparticle 3a is 1/50,000 or more and 1/100 or less, relative to a particle size of the core particle 2, and after being subjected to a heat treatment in which the core particle 2 is heated at a sintering temperature or higher, a specific resistance after the heat treatment is 110% or more of a specific resistance before the heat treatment.

An insulating material coated soft magnetic powder, which is a powder body of an insulating material coated soft magnetic particle 1, includes: a core particle 2 including a base portion 2a that includes a soft magnetic material, and an oxide film 2b that is provided on a surface of the base portion 2a and contains an oxide of an element contained in the soft magnetic material, and an insulating film 3b in which a plurality of insulating nanoparticles 3a are attached to the core particle 2. A particle size of each nanoparticle 3a is 1/50,000 or more and 1/100 or less, relative to a particle size of the core particle 2, and after being subjected to a heat treatment in which the core particle 2 is heated at a sintering temperature or higher, a specific resistance after the heat treatment is 110% or more of a specific resistance before the heat treatment.

One object of the present invention is to provide an electronic component less prone to migration of impurity atoms between a conductor and an external electrode. A coil component as an electronic component includes: a base body; a conductor; a first external electrode electrically connected to the conductor; a second external electrode electrically connected to the conductor; and a metal film positioned between the conductor and the first external electrode, wherein the metal film contains metal particles configured such that an average of β/α is 0.8 to 1.2, where for each of the metal particles, α is a dimension of the metal particle in a direction horizontal to a boundary interface, and β is a dimension of the metal particle in a direction perpendicular to the boundary interface.

One object of the present invention is to provide an electronic component less prone to migration of impurity atoms between a conductor and an external electrode. A coil component as an electronic component includes: a base body; a conductor; a first external electrode electrically connected to the conductor; a second external electrode electrically connected to the conductor; and a metal film positioned between the conductor and the first external electrode, wherein the metal film contains metal particles configured such that an average of β/α is 0.8 to 1.2, where for each of the metal particles, α is a dimension of the metal particle in a direction horizontal to a boundary interface, and β is a dimension of the metal particle in a direction perpendicular to the boundary interface.