BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a soft magnetic alloy ribbon and a magnetic component.

Description of the Related Art

As one form of a soft magnetic material, a soft magnetic alloy material is known. Further, a magnetic core using a soft magnetic alloy ribbon obtained by forming a soft magnetic alloy material into a ribbon shape is known. In order to reduce a size and improve properties of the magnetic core, it is required to improve magnetic properties (saturation magnetic flux density) of the soft magnetic alloy ribbon.

Patent Document 1 describes an invention related to an amorphous alloy ribbon, a nanocrystalline soft magnetic alloy, and the like. According to Patent Document 1, segregation of C generated on a surface of the ribbon can be controlled by controlling an amount of C in the ribbon and further controlling a gas atmosphere in a vicinity of a cooling roll.

Patent Document 2 describes an invention related to an amorphous alloy ribbon, a nanocrystalline soft magnetic alloy, and the like. According to Patent Document 2, segregation of Cu generated on a surface of the ribbon can be controlled by controlling a temperature of the ribbon on a roll during manufacturing the ribbon.

Patent Document 3 describes a soft magnetic alloy ribbon that has a base phase in which fine crystal grains having an average grain size of 60 nm or less are dispersed in an amorphous substance at a volume fraction of 50% or more, and that has an oxide film on a surface, in which a part of the oxide film has a B concentration lower than an average B concentration in the base phase.[Patent Document 1] Japanese Patent Laid-Open No. 2007-182594[Patent Document 2] Japanese Patent Laid-Open No. 2009-263775[Patent Document 3] Japanese Patent Laid-Open No. 2011-149045

Generally, the soft magnetic alloy ribbon is manufactured by a super-rapid cooling method such as a single-roll method. In a case of mass production, the soft magnetic alloy ribbon is generally manufactured in an air atmosphere. Therefore, Fe in a vicinity of a surface of the soft magnetic alloy ribbon is oxidized, and a total amount of magnetic materials decreases. Patent Document 1 and Patent Document 2 do not describe the oxidation of Fe. Since the oxide film of the soft magnetic alloy ribbon in Patent Document 3 is thick, the total amount of magnetic materials is reduced.

SUMMARY OF THE INVENTION

An object of the present invention is to obtain a soft magnetic alloy ribbon having high corrosion resistance and good magnetic properties.

In order to achieve the above object, a soft magnetic alloy ribbon according to the present invention includes

Fe; and

M, in which

M is at least one selected from the group consisting of Nb, Ta, W, Zr, Hf, Mo, Cr, and Ti, and a part of M is included in oxides, and

a maximum point of a concentration of at least one of M included in the oxides is present in a region within 20 nm from the surface, when a concentration distribution of an element contained in the soft magnetic alloy ribbon is measured from a surface toward an interior of the soft magnetic alloy ribbon in a thickness direction.

The soft magnetic alloy ribbon according to the present invention has the above features, and thus becomes a soft magnetic alloy ribbon having high corrosion resistance and good magnetic properties.

The soft magnetic alloy ribbon according to the present invention may further include Si, in which

a part of Si may be included in oxides, anda maximum point of a concentration of Si included in the oxides may be present in the region within 20 nm from the surface, when the concentration distribution of the element contained in the soft magnetic alloy ribbon is measured from the surface toward the interior of the soft magnetic alloy ribbon in the thickness direction.

The soft magnetic alloy ribbon according to the present invention, in which

[Si]/[M]≥1.50 is satisfied, when a concentration of M included in the oxides at the maximum point of the concentration of M is set as [M], and a concentration of Si included in the oxides at the maximum point of the concentration of Si is set as [Si].

The soft magnetic alloy ribbon according to the present invention may have a composition ratio of Si of 0.1 at % or more and 10 at % or less.

The soft magnetic alloy ribbon according to the present invention may have a composition ratio of M of more than 3 at % and 10 at % or less.

The soft magnetic alloy ribbon according to the present invention, in which amorphous may be observed in the ribbon.

The soft magnetic alloy ribbon according to the present invention, in which nanocrystals may be included in the ribbon.

A magnetic component according to the present invention includes the soft magnetic alloy ribbon described above.

