The present invention provides an undercooling solidification method for preparing an amorphous or nanocrystalline soft magnetic alloy with high Fe content and the applicable amorphous or nanocrystalline alloy composition. The undercooling solidification is realized by glass purification combined with cyclical superheating or electromagnetic levitation melting. An undercooling solidification alloy is prepared into amorphous strips or powders through rapid quenching or atomization of melt, and can be prepared into a nanocrystalline alloy through heat treatment. The chemical formula of the applicable amorphous or nanocrystalline alloy is FeSiBM, wherein M is one or more of P, C, Nb, Mo, Zr, Hf, Mo, Y, Cu and Co. The amorphous or nanocrystalline alloy prepared by undercooling non-equilibrium solidification has the characteristics of high amorphous forming ability, high saturation magnetization and low coercive force.

A metal strip contains a metal magnetic material as a main component, and is formed such that a surface roughness of one main surface is higher than a surface roughness of an other main surface. The other main surface is formed in a smooth surface having a high surface smoothness, and the one main surface is subjected to surface treatment such that a striped pattern composed of a recessed portion and a protruding portion is continuously formed. After a continuous strip is made by a single-roll liquid quenching method, the striped pattern is formed by subjecting one main surface of the continuous strip to surface treatment. A magnetic core is obtained by winding the metal strip in an annular shape, and a coil component, such as a common mode choke coil, is obtained by using the magnetic core. Thus, the metal strip has sufficient toughness and good mechanical strength.

A soft magnetic alloy comprising a main component having a compositional formula of ((Fe.sub.(1(+))X1.sub.X2.sub.).sub.(1(a+b+c))M.sub.aB.sub.bCr.sub.c).sub.1dC.sub.d, and a sub component including P, S and Ti, wherein X1 is selected from the group Co and Ni, X2 is selected from the group Al, Mn, Ag, Zn, Sn, As, Sb, Bi and rare earth elements, M is selected from the group Nb, Hf, Zr, Ta, Mo, W and V, 0.030a0.14, 0.005b0.20, 0<c0.040, 0d0.040, 0, 0, and 0+0.50 are satisfied, when soft magnetic alloy is 100 wt %, P is 0.001 to 0.050 wt %, S is 0.001 to 0.050 wt %, and Ti is 0.001 to 0.080 wt %, and when a value obtained by dividing P by S is P/S, then P/S satisfies 0.10P/S10.

Provided is a method that includes ejecting an FeSiB-based molten alloy containing iron (Fe), boron (B), and silicon (Si) as essential components from a tapping nozzle to a surface of a cooling roll and rotating the cooling roll at a surface speed of 15 m/sec or more and 50 m/sec or less to rapidly cool the FeSiB-based molten alloy on the surface of the cooling roll to manufacture an alloy ribbon, the tapping nozzle includes a single slit formed to have a width of 0.6 mm or more and less than 2.0 mm, the cooling roll has a curvature of 810.sup.4 or more and less than 210.sup.3, and the method includes passing cooling water in an amount of 0.3 m.sup.3/min or more and less than 20 m.sup.3/min at 5 C. or more and less than 60 C. through the cooling roll to manufacture a rapidly solidified alloy ribbon having an average thickness of 30 m or more and less than 55 m.

A soft magnetic alloy material includes nanocrystals and amorphous phase and includes Fe (iron), Co (cobalt), and P (phosphorus), wherein the soft magnetic alloy material is represented by Composition Formula 1, when an average content of Co in the amorphous phase is Co(a) (at %) and an average content of Co in the nanocrystal, Co(c)Co(a)>0, Composition Formula 1: Fe.sub.aCo.sub.bP.sub.cM.sub.d, in Composition Formula 1, a, b, c, and d represent an atomic percentage content (at %) of corresponding elements, respectively, 0<a90, 0<b20, 0<c10, 0<d20, and a+b+c+d=100, and M includes Si, B, Cu, Cr, C, Ni, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, S, or a combination thereof.

A soft magnetic alloy including a composition having a formula of ((Fe.sub.(1-(+))X1.sub.X2.sub.).sub.(1-(a+b+c+d+e))M.sub.aB.sub.bP.sub.cCr.sub.dCu.sub.e).sub.1-fC.sub.f. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.030a0.14, 0.028b0.20, 0<c0.014, 0<d0.040, 0e0.030, 0f0.040, 0, 0, and 0+0.50 are satisfied.

The invention relates to the reduction of core losses in soft magnetic applications utilizing amorphous foil as the core material. Amorphous foil is known to have lower losses when compared to crystalline silicon steel laminations. It is found that a reduction of 10-40% of losses can be achieved over the current state of the art amorphous material by mechanical scribing of the surface of the soft magnetic laminations comprising the wound core in power conditioning devices such as a transformer. The scribing process introduces control of the magnetic domains causing ease of magnetic flux reversal.

The object of the present invention is to provide an alloy ribbon capable of having excellent adhesiveness between the alloy ribbons when a plurality of the alloy ribbons is stacked; and also, to provide a magnetic core using the alloy ribbon. The present invention is an alloy ribbon comprising metals scattered on at least one surface of the alloy ribbon, in which diameters of the scattered metals are 1 m or more, and the scattered metals include Cu.

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 material and a method for producing the same. The soft magnetic material is: Fe.sub.100-x-y-z-wB.sub.xNi.sub.ySi.sub.zM.sub.w (In the formula, M is one or more inevitable elements selected from Nb, Mo, Ta, W, Co, and Sn, and x, y, z, and w are in atomic percent satisfying 12x17, 1y3, 0<z1, 0<w0.1). Soft magnetic material includes -Fe phase which contains crystals whose average particle size is 30 nm or less. The average particle size of crystals is average value of projected area circular equivalent diameters of crystals in a transmission electron microscope image of soft magnetic material thinned by focused ion beam. The ratio of peak area of crystalline plane to overall peak area as measured by XRD of -Fe phase on surface of soft magnetic material is equal to or greater than 0.10.