# US 11,441,213 B2 · Soft magnetic alloy ribbon and magnetic component

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- Number: US 11,441,213 B2
- Document ID: US11441213B2
- Status: Granted
- Kind: B2
- Application number: 16/952,358
- Filed: 2020-11-19
- Published: 2021-05-27
- Granted: 2022-09-13
- Earliest claimed: 2019-11-22
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Takuya Tsukahara; Isao Nakahata; Kazuhiro Yoshidome; Hiroyuki Matsumoto
- Web page: https://patentgrep.com/patent/US11441213B2

## CPC

- C22C 38/12: containing tungsten, tantalum, molybdenum, vanadium, or niobium
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/02: containing silicon
- H01F 1/15308: {based on Fe/Ni (H01F1/15325 takes precedence)}
- H01F 1/15333: {containing nanocrystallites, e.g. obtained by annealing}
- B22D 11/0611: {formed by a single casting wheel, e.g. for casting amorphous metal strips or wires}
- C22C 2202/02: Magnetic
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)

## Abstract

A soft magnetic alloy ribbon having high corrosion resistance and good magnetic properties is obtained. The soft magnetic alloy ribbon contains Fe and M. 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. 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.

## Claims

### Claim 1

A soft magnetic alloy ribbon, comprising:
Fe; and
M and Si,
wherein M is at least one selected from the group consisting of Nb, Ta, W, Zr, Hf, Mo, Cr, and Ti,
a part of M is included in oxides,
a part of Si is included in oxides, and
a maximum point of an atomic concentration of at least one of M included in the oxides and a maximum point of an atomic concentration of Si included in the oxides are present in a region within 20 nm from the surface, when an atomic 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.

### Claim 2 (depends on 1)

The soft magnetic alloy ribbon according to claim 1, wherein [Si]/[M]≥1.50 is satisfied, when an atomic concentration of M included in the oxides at the maximum point of the atomic concentration of M is set as [M], and an atomic concentration of Si included in the oxides at the maximum point of the atomic concentration of Si is set as [Si].

### Claim 3 (depends on 1)

The soft magnetic alloy ribbon according to claim 1, wherein a composition ratio of Si is 0.1 at % or more and 10 at % or less.

### Claim 4 (depends on 1)

The soft magnetic alloy ribbon according to claim 1, wherein a composition ratio of M is more than 3 at % and 10 at % or less.

### Claim 5 (depends on 1)

The soft magnetic alloy ribbon according to claim 1, wherein amorphous is observed in the ribbon.

### Claim 6 (depends on 1)

The soft magnetic alloy ribbon according to claim 1, wherein nanocrystals are included in the ribbon.

### Claim 7 (depends on 1)

A magnetic component comprising the soft magnetic alloy ribbon according to claim 1.