A powder core includes a compact including a soft magnetic powder, and an outer coating of the compact. The outer coating contains polyethersulfone. An electric or electronic component including the powder core, and an electric or electronic device having the electric or electronic component mounted therein are also provided.

A specific depth at which a concentration of Fe reaches 10 at % is 18 nm or more and 500 nm or less from the first surface, and from the first surface to the specific depth, the concentration of Fe is less than 10 at %, and a positive increase region is present in which the concentration of Fe increases with a substantially positive concentration gradient, in a case where the concentration of Fe is measured in a depth direction from a first surface of a ribbon.

Provided a soft magnetic alloy ribbon containing Fe and B. Convex portions having an average convex portion height of 7 nm to 130 nm are present on an alloy surface.

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.

One object is to increase the filling factor of magnetic particles and increase the evenness of distribution of the magnetic particles in a magnetic main body of a coil component. A coil component includes: a magnetic main body containing a resin and magnetic particles; and a coil conductor embedded in the magnetic main body. The magnetic particles include large-sized magnetic particles, middle-sized magnetic particles, and small-sized magnetic particles. The proportion of the volume of the large-sized magnetic particles to the total volume of all the magnetic particles is 70 vol % to 85 vol %, the proportion of the volume of the middle-sized magnetic particles to the total volume is 2 vol % to 28 vol %, and the proportion of the volume of the small-sized magnetic particles to the total volume is 2 vol % to 28 vol %. The particle size distribution of the small-sized magnetic particles overlaps that of the middle-sized magnetic particles.

Provided is a soft magnetic powder that can produce a dust core having excellent magnetic properties. The soft magnetic powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of Fe.sub.aSi.sub.bB.sub.cP.sub.dCu.sub.eM.sub.f, where the M is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %≤a≤84.5 at %, 0 at %≤b<6 at %, 0 at %<c≤10 at %, 4 at %<d≤11 at %, 0.2 at %≤e≤0.53 at %, 0 at %≤f≤4 at %, a+b+c+d+e+f=100 at %, a particle size is 1 mm or less, and a median of circularity of particles constituting the soft magnetic powder is 0.4 or more and 1.0 or less.

A soft magnetic alloy including 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, and 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.

A soft magnetic alloy including 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, and a Co concentration degree of the Co concentrated area is larger than 1.2.

An Fe-based nanocrystalline alloy is represented by Composition Formula, (Fe.sub.(1-a)M.sup.1a).sub.100-b-c-d-e-gM.sup.2.sub.bB.sub.cP.sub.dCu.sub.eM.sup.3.sub.g, where M.sup.1 is at least one element selected from the group consisting of Co and Ni, M.sup.2 is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, and Mn, M.sup.3 is at least two elements selected from the group consisting of C, Si, Al, Ga, and Ge but necessarily includes C, and 0≤a≤0.5, 1.5<b≤3, 10≤c≤13, 0<d≤4, 0<e≤1.5, and 8.5≤g≤12.

A mixture for making a multilayer inductor, wherein the mixture comprises a first magnetic powder, a second magnetic powder, and a glass material, wherein each of the first magnetic powder and the second magnetic powder comprises an amorphous or nanocrystalline magnetic powder, wherein a softening point temperature of the glass material is in a range of 300°˜430° C.