Magnetic material and electronic component

Patent metadata

Field	Value
Publication number	US-10622129-B2
Application number	US-201715638100-A
Country	US
Kind code	B2
Filing date	Jun 29, 2017
Priority date	Jun 30, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A magnetic material has: multiple soft magnetic alloy grains that contain Fe, element L (where element L is Si, Zr, or Ti), and element M (where element M is not Si, Zr, or Ti, and oxidizes more easily than Fe); a first oxide film that contains element L and covers each of the multiple soft magnetic alloy grains; a second oxide film that contains element M and covers the first oxide film; a third oxide film that contains element L and covers the second oxide film; a fourth oxide film that contains Fe and covers the third oxide film; and bonds that are constituted by parts of the fourth oxide film and that bond the multiple soft magnetic alloy grains together.

First claim

We claim:

1. A magnetic material, comprising:
multiple soft magnetic alloy grains that contain Fe, element L (where element L is Si, Zr, or Ti), and element M (where element M is not Si, Zr, or Ti, and oxidizes more easily than Fe);
a first oxide film that contains element L and covers each of the multiple soft magnetic alloy grains;
a second oxide film that contains element M and covers the first oxide film;
a third oxide film that contains element L, covers the second oxide film, and is amorphous in nature; and
a fourth oxide film that contains Fe and covers the third oxide film; and

bonding parts that are constituted by parts of the fourth oxide film and that bond the multiple soft magnetic alloy grains together.

2. A magnetic material according to claim 1 , wherein element M is Cr.

3. A magnetic material according to claim 1 , wherein element L is Si.

4. A magnetic material according to claim 1 , wherein the third oxide film has a thickness equal to or greater than a thickness of the first oxide film.

5. A magnetic material according to claim 1 , wherein the third oxide film has a thickness of 1 nm or more but no more than 20 nm.

6. A magnetic material according to claim 1 , wherein the first oxide film contains more element L than element M, the second oxide film contains more element M than element L, the third oxide film contains more element L than element M and is amorphous, and the fourth oxide film contains more Fe than element L and also contains more Fe than does any of the first to third oxide films.

7. A magnetic material according to claim 1 , wherein each of the multiple soft magnetic alloy grains is covered with a coating layer as the first oxide film, said coating layer being constituted by amorphous silicon oxide and covering substantially an entire surface of each grain.

8. A magnetic material according to claim 7 , wherein the coating layer has a thickness of 1 nm or more and less than 25 nm.

9. A magnetic material comprising:
multiple soft magnetic alloy grains that contain Fe, element L (where element L is Si, Zr, or Ti), and element M (where element M is not Si, Zr, or Ti, and oxidizes more easily than Fe);
a first oxide film that contains element L and covers each of the multiple soft magnetic alloy grains;
a second oxide film that contains element M and covers the first oxide film;
a third oxide film that contains element L, covers the second oxide film, and is amorphous in nature; and
a fourth oxide film that contains Fe and covers the third oxide film.

10. An electronic component having a magnetic core that contains a magnetic material according to claim 1 .

11. An electronic component having a magnetic core that contains a magnetic material according to claim 2 .

12. An electronic component having a magnetic core that contains a magnetic material according to claim 3 .

13. An electronic component having a magnetic core that contains a magnetic material according to claim 4 .

14. An electronic component having a magnetic core that contains a magnetic material according to claim 5 .

15. An electronic component having a magnetic core that contains a magnetic material according to claim 6 .

16. An electronic component having a magnetic core that contains a magnetic material according to claim 7 .

17. An electronic component having a magnetic core that contains a magnetic material according to claim 8 .

18. An electronic component having a magnetic core that contains a magnetic material according to claim 9 .

Assignees

• Taiyo Yuden Kk

Inventors

• Orimo Yoko
• Li Xinyu
• Takeoka Shinsuke
• He Chengli
• Otake Kenji

Classifications

• H01F10/265

  Magnetic multilayers non exchange-coupled (H01F10/32 takes precedence) · CPC title

• C01B33/12 Primary

  Silica; Hydrates thereof, e.g. lepidoic silicic acid · CPC title

• H01F1/342 Primary

  Oxides (H01F1/36 and H01F1/38 take precedence) · CPC title

• C22C38/18

  containing chromium · CPC title

• C22C38/02

  containing silicon · CPC title