Provided are: a novel magnetic material having high magnetic stability, in particular, having an extremely high saturation magnetization; and a method for producing the same, wherein the magnetic material, due to having a higher saturation magnetization than ferrite magnetic materials and a higher electrical resistivity than existing metallic magnetic materials, resolves problems such as eddy current loss. According to the present invention, Co-ferrite nanoparticles obtained by wet synthesis are reduced in hydrogen and subjected to grain growth, and bcc- or fcc-(Fe, Co) phases and Co-enriched phases are nano-dispersed using phase separation via a disproportionation reaction to prepare a magnetic material powder. In addition, the magnetic material powder is sintered into a solid magnetic material.

An object is to provide a magneto-sensitive wire (magneto-sensitive body) with which the measurement range of a magnetic sensor can be expanded, the heat resistance and the high-temperature durability can be improved, and other appropriate properties can be obtained. The magneto-sensitive wire of the present invention is composed of a Co-based alloy having a composite structure in which crystal grains are dispersed in an amorphous phase. The Co-based alloy is, for example, a CoFeSiB-based alloy. In this case, the total amount of Si and B is preferably 20 to 25 at % with respect to the Co-based alloy as a whole. Preferably, the average diameter of the crystal grains is 70 nm or less and the area ratio of the crystal grains is 10% or less to the composite structure as a whole. The magneto-sensitive wire has a circular cross section, for example, and the wire diameter is about 1 to 100 m. Such a magneto-sensitive wire can be obtained, for example, through a heat treatment step of heating an amorphous wire composed of a Co-based alloy at a temperature equal to or higher than a crystallization start temperature and lower than a crystallization end temperature. This step is preferably performed while applying tensile stress to the amorphous phase.

A method for producing soft magnetic strip material for roll tape-wound cores with the following steps: preparing a band-shaped material, applying a heat-treatment temperature to the band-shaped material, and applying a tensile force to the temperature-applied band-shaped material in one longitudinal direction of the band-shaped material in order to produce a tensile stress in the band-shaped material, to produce the soft magnetic strip material from the band-shaped material, the method, moreover, comprising determining at least one magnetic measurement value of the soft magnetic strip material that has been produced and controlling the tensile force for setting the tensile stress in a reaction to the determined magnetic measurement value. Furthermore, a device for carrying out the method and a roll tape-wound core produced by means of the method are made available.

A receiving antenna of a wireless power receiving apparatus for wireless power charging according to one embodiment of the present invention comprises: a substrate; a soft magnetic layer disposed on the substrate; and a receiving coil which is wound in parallel with a plane of the soft magnetic layer and is embedded on one surface of the soft magnetic layer, wherein at least one surface of the receiving coil is slantly embedded on the one surface of the soft magnetic layer.

A soft magnetic alloy comprising an internal area having a soft magnetic type alloy composition including Fe and Co, a Co concentrated area existing closer to a surface side than the internal area and having a higher Co concentration than in the internal area, a SB concentrated area existing closer to the surface side than the Co concentrated area and having a higher concentration of at least one element selected from Si and B than in the internal area, and a Fe concentrated area including Fe existing closer to the surface side than the SB concentrated area; wherein a crystalized area ratio of the SB concentrated area represented by S.sub.SB.sup.cry/S.sub.SB and a crystalized area ratio of the Fe concentrated area represented by S.sub.Fe.sup.cry/S.sub.Fe, satisfy a relation of (S.sub.SB.sup.cry/S.sub.SB)<(S.sub.Fe.sup.cry/S.sub.Fe).

A laminated core comprising a plurality of lamination sheets made of a soft magnetic alloy is provided. The lamination sheets have a main surface and a thickness d. The main surfaces of the lamination sheets are stacked one on top of another in a direction of stacking. Adjacent lamination sheets are joined to one another by a plurality of substance-to-substance joints, the joints being filler-free and entirely surrounded by the main surfaces of the adjacent lamination sheets.

A method producing soft magnetic strip material for roll tape-wound cores with the following steps: preparing a band-shaped material, applying a heat-treatment temperature to the band-shaped material, and applying a tensile force to the temperature-applied band-shaped material in one longitudinal direction of the band-shaped material in order to produce a tensile stress in the band-shaped material, to produce the soft magnetic strip material from the band-shaped material, the method, moreover, comprising determining at least one magnetic measurement value of the soft magnetic strip material that has been produced and controlling the tensile force for setting the tensile stress in a reaction to the determined magnetic measurement value. Furthermore, a device for carrying out the method and a roll tape-wound core produced by means of the method are made available.

Provided herein is a dust core having high mechanical strength and high magnetic permeability. An alloy powder constituting the dust core is also provided. A soft magnetic powder is used that has a plurality of protrusions of 0.1 m or more and 5 m or less on an alloy powder surface. A dust core is used that contains at least 80 weight % of the soft magnetic alloy powder. A method for producing a soft magnetic powder is used that includes producing an amorphous soft magnetic alloy ribbon by liquid quenching; and pulverizing the amorphous soft magnetic alloy ribbon into a powder having a thickness of 0.1 m or more and 40 m or less without heat treatment. The pulverization cleaves the amorphous soft magnetic alloy ribbon, and produces a protrusion on a powder surface.

Amorphous alloy soft magnetic powder includes a composition expressed by a composition formula in atomic ratio (Fe.sub.xCo.sub.1-x).sub.100?(a+b)(Si.sub.yB.sub.1-y).sub.aM.sub.b, where M is at least one type selected from the group consisting of C, S, P, Sn, Mo, Cu, and Nb, 0.73?x?0.85, 0.02?y?0.10, 13.0?a?19.0, and 0?b?2.0; and impurities. The amorphous alloy soft magnetic powder has an average circularity of 0.85 or more, an average aspect ratio of 1.20 or less, and an average particle size of 10 ?m or more and 40 ?m or less. In the amorphous alloy soft magnetic powder, a rate of decrease D in magnetic permeability accompanying an increase in frequency is 15% or less.

A soft magnetic alloy powder includes a particle body and a surface layer. The particle body comprises a soft magnetic alloy including Fe and Co. The surface layer is located on a surface side of the particle body. The surface layer includes one or more local maximum points of Si concentration and one or more local maximum points of Co concentration. The surface layer satisfies D.sub.Si?D.sub.Co, in which D.sub.Si is a distance from an interface between the particle body and the surface layer to a first Si local maximum point L.sup.Si.sub.max, and D.sub.Co is a distance from the interface to a first Co local maximum point L.sup.Co.sub.max.