A multilayer magnetic sheet comprises a first laminate substrate layer and a second laminate substrate layer, which are stacked in a thickness direction and in each of which laminate substrates each formed in a band shape are arranged in a plate shape such that long sides of the laminate substrates are adjacent to each other, the laminate substrate comprising two or more stacked layers of magnetic ribbons. A direction in which the long sides of the laminate substrates in the second laminate substrate layer extend intersects a direction in which the long sides of the laminate substrates in the first laminate substrate layer extend.

An Fe-based nanocrystalline soft magnetic alloy including an amorphous phase and crystal grains, wherein clusters are dispersed in the amorphous phase and the alloy has a composition represented by (Fe.sub.1-x-ySi.sub.xAl.sub.y).sub.100-a-b-cM.sub.aM′.sub.bCu.sub.c (M represents one or more elements selected from the group consisting of Nb, W, Zr, Hf, Ti and Mo; M′ represents one or more elements selected from the group consisting of B, C and P; a, b and c represent 2.0≤a≤5.0, 3.0<b<10.0 and 0<c<3.0, each in atomic %; and x and y represent 0.150≤x≤0.250 and 0.012≤y≤0.100 and satisfy 0.190≤x+y≤0.290).

A method for manufacturing a wound magnetic core of a nanocrystalline soft magnetic alloy ribbon, the method including: a first heat treatment step of subjecting a wound magnetic core, which is formed by winding an amorphous soft magnetic alloy ribbon capable of nanocrystallization, to a heat treatment at a temperature that is 300° C. or higher and below a crystallization start temperature, with a first inner shape correction jig for holding the wound magnetic core in a non-circular shape placed in an internal space of the wound magnetic core; and a second heat treatment step of subjecting the wound magnetic core to a heat treatment for nanocrystallization at a temperature equal to or higher than the crystallization start temperature, with the first inner shape correction jig removed and with at least one second inner shape correction jig placed in the internal space of the wound magnetic core, wherein: a cross section of the second inner shape correction jig perpendicular to a direction in which the second inner shape correction jig extends is smaller than a cross section of the first inner shape correction jig perpendicular to a direction in which the first inner shape correction jig extends; and a magnetic field is applied to the wound magnetic core over a partial period of the second heat treatment step.

An Fe-based amorphous alloy ribbon reduced in an iron loss in a condition of a magnetic flux density of 1.45 T is provided. One aspect of the present disclosure provides an Fe-based amorphous alloy ribbon. The Fe-based amorphous alloy ribbon has continuous linear laser irradiation marks on at least one surface. The linear laser irradiation marks are formed along a direction orthogonal to a casting direction of the Fe-based amorphous alloy ribbon. Each linear laser irradiation mark has unevenness on its surface. When the unevenness is evaluated in the casting direction, a difference HL between a highest point and a lowest point in the thickness direction of the Fe-based amorphous alloy ribbon is 0.25 μm to 2.0 μm.

[PROBLEM] To provide a wound magnetic core and a method for manufacturing a wound magnetic core permitting improvement of insulation between ribbon layers in a wound magnetic core at which soft magnetic metal ribbon has been wound to form an annular wound body. [SOLUTION MEANS] A nonmagnetic insulating metal oxide powder is made to adhere to a surface of a soft magnetic metal ribbon having an amorphous structure; this is wound in annular fashion and made into a wound body at which the metal oxide powder intervenes between ribbon layers; the wound body is made to undergo heat treatment in a nonoxidizing atmosphere; the wound body is thereafter subjected to treatment for formation of an oxide film in an oxidizing atmosphere adjusted to be at a temperature lower than that at the heat treatment to cause oxidation of the surface of the soft magnetic metal ribbon; and spaces between ribbon layers at the wound body are moreover impregnated with resin and curing is carried out to fuse the metal oxide powder thereto.

Provided is a core for a stationary electromagnetic apparatus, in which a compressive stress load in the laminating direction of amorphous thin strips that form an amorphous core is suppressed so that noise generated by magnetostrictive vibration is reduced while maintaining a space factor of the amorphous core. The core for a stationary electromagnetic apparatus 10 according to the present invention includes: a laminated body 1 formed of amorphous metal thin strips; and a holding member 2 that holds the laminated body 1, in which a width b of the holding member 2 is equal to or more than a width a of the laminated body 1 in a laminating direction.

An Fe-based amorphous alloy ribbon reduced in an iron loss in a condition of a magnetic flux density of 1.45 T is provided. One aspect of the present disclosure provides an Fe-based amorphous alloy ribbon. The Fe-based amorphous alloy ribbon has continuous linear laser irradiation marks on at least one surface. The linear laser irradiation marks are formed along a direction orthogonal to a casting direction of the Fe-based amorphous alloy ribbon. Each linear laser irradiation mark has unevenness on its surface. When the unevenness is evaluated in the casting direction, a difference HL between a highest point and a lowest point in the thickness direction of the Fe-based amorphous alloy ribbon is 0.25 μm to 2.0 μm.

An assembly device for a three-dimensional triangular iron core is provided according to the present application, including iron core driving devices each for driving an iron core to be assembled with adjacent iron cores. There are three iron core driving devices, and each of the iron core driving devices includes an iron core fixing device and a driving assembly for driving the iron core fixing device to move. When the three-dimensional triangular iron core is required to be assembled, firstly, the three iron cores are mounted on the corresponding iron core fixing devices respectively, then the iron core fixing devices are driven by driving assemblies to move toward one another, thereby driving adjacent iron cores to move toward each other until the adjacent iron cores are assembled, and then each two adjacent iron cores are wound and assembled.

An alloy having a formula Fe.sub.aCo.sub.bNi.sub.cCu.sub.dM.sub.eSi.sub.fB.sub.gX.sub.h is provided. M is at least one of V, Nb, Ta, Ti, Mo, W, Zr, Cr, Mn and Hf; a, b, c, d, e, f, g are in at. %; X denotes impurities and optional elements P, Ge and C; and a, b, c, d, e, f, g, h satisfy the following:
0≤b≤4,
0≤c<4,
0.5≤d≤2,
2.5≤e≤3.5,
14.5≤f≤16,
6≤g≤7,
h<0.5, and
1≤(b+c)≤4.5, where a+b+c+d+e+f+g=100. The alloy has a nanocrystalline microstructure, a saturation magnetostriction of |λ.sub.s|≤1 ppm, a hysteresis loop with a central linear part, and a permeability (μ) of 10,000 to 15,000.

An amorphous metal ribbon includes a plurality of laser irradiation mark rows each including a plurality of laser irradiation marks arranged in a row, in which when a distance between the laser irradiation mark rows that are adjacent to each other is set as d1, a distance between the laser irradiation marks in the laser irradiation mark row is set as d2, a diameter of the laser irradiation mark is set as d3, and a number density D of the laser irradiation marks is set as (1/d1)×(1/d2), the number density D of the laser irradiation marks is 0.05 pieces/mm.sup.2 or more and 0.50 pieces/mm.sup.2 or less, and when an area occupancy rate A of the laser irradiation marks is set as D×(d3/2).sup.2×π×100, the area occupancy rate A of the laser irradiation marks is 0.0035% or more and 0.040% or less.