Disclosed herein is a composite magnetic powder that includes an iron-containing magnetic powder, and an insulating layer comprising a silicon oxide formed on a surface of the iron-containing magnetic powder. An O/Si ratio of the silicon oxide constituting the insulating layer is 2.1 or more and 2.2 or less.

A coil component is capable of suppressing permeation of liquid or gas into a magnetic portion and increasing mechanical strength of the magnetic portion. A coil component includes a magnetic portion including soft magnetic metal particles having an insulating oxide layer on a surface thereof, with the soft magnetic metal particles being bonded to each other with the insulating oxide layer interposed therebetween; and a coil portion provided inside or on the surface of the magnetic portion. A mixture containing a resin and inorganic particles is disposed between the soft magnetic metal particles.

A core can be used for an electronic component, and composite particles constitute the core. The composite particles contain magnetic large particles, small particles directly or indirectly attached to surfaces of the large particles and have an average particle size smaller than an average particle size of the large particles, and a mutual buffer film covering at least part of the surfaces of the large particles located between the small particles existing around the large particles. When the average particle size of the large particles is R, the average particle size of the small particles is r, and an average thickness of the mutual buffer film is t, (r/R) is 0.0012 or more and 0.025 or less, (t/r) is larger than 0 and 0.7 or less, and r is 12 nm or more and 100 nm or less.

Soft magnetic metal powder which includes a plurality of soft magnetic metal particles configured by a Fe-based nanocrystal alloy including Cu is provided, wherein the soft magnetic metal particles have core portions and first shell portions surrounding circumferences of the core portions; when an average crystallite size of Cu crystallites existing in the core portions is set as A, and the largest crystallite size of Cu crystallites existing in the first shell portions is set as B, B/A is 3.0 or more and 1000 or less.

Soft magnetic metal powder which includes a plurality of soft magnetic metal particles configured by a Fe-based nanocrystal alloy including Cu is provided, wherein the soft magnetic metal particles have core portions and first shell portions surrounding circumferences of the core portions; when an average crystallite size of Cu crystallites existing in the core portions is set as A, and the largest crystallite size of Cu crystallites existing in the first shell portions is set as B, B/A is 3.0 or more and 1000 or less.

A sintered body containing: a plurality of coated grains each having a metal magnetic body grain coated with a resin layer; a plurality of ferrite grains; and an amorphous phase between the plurality of coated grains and the plurality of ferrite grains. The amorphous phase may contain a metal element that is the same as a metal element contained in the ferrite grains.

A system for producing a soft magnetic material having a core-shell structure includes a gas supply configured to supply at least one gas; and a furnace configured to receive the at least one gas. A flow of the at least one gas is configured to be varied to provide a shell on a particle in the furnace.

Provided is a power inductor. The power inductor includes a body, at least one base material disposed within the body, at least one coil pattern disposed on at least one surface of the base material, an insulation layer disposed between the coil pattern and the body, and an external electrode disposed outside the body and connected to the coil pattern. The body includes a magnetic pulverized material and an insulation material.

A method for producing a Fe—Co alloy powder suitable for an antenna includes steps, wherein when introducing an oxidizing agent into an aqueous solution containing Fe ions and Co ions to generate crystal nuclei and cause precipitation and growth of a precursor having Fe and Co as components, Co in an amount corresponding to 40% or more of the total amount of Co used for the precipitation reaction is added to the aqueous solution at a time after the start of the crystal nuclei generation and before the end of the precipitation reaction to obtain the precursor. Then, a dried product of the precursor is reduced to obtain a Fe—Co alloy powder. This Fe—Co alloy powder has a mean particle size of 100 nm or less, a coercive force Hc of 52.0 to 78.0 kA/m, and a saturation magnetization ss of 160 Am.sup.2/kg or higher.

A method for producing a Fe—Co alloy powder suitable for an antenna includes steps, wherein when introducing an oxidizing agent into an aqueous solution containing Fe ions and Co ions to generate crystal nuclei and cause precipitation and growth of a precursor having Fe and Co as components, Co in an amount corresponding to 40% or more of the total amount of Co used for the precipitation reaction is added to the aqueous solution at a time after the start of the crystal nuclei generation and before the end of the precipitation reaction to obtain the precursor. Then, a dried product of the precursor is reduced to obtain a Fe—Co alloy powder. This Fe—Co alloy powder has a mean particle size of 100 nm or less, a coercive force Hc of 52.0 to 78.0 kA/m, and a saturation magnetization ss of 160 Am.sup.2/kg or higher.