Magnetic structural body

Patent metadata

Field	Value
Publication number	US-11862371-B2
Application number	US-202016989700-A
Country	US
Kind code	B2
Filing date	Aug 10, 2020
Priority date	Feb 13, 2018
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

A magnetic structural body contains core-shell structure particles each including a core section and a shell section covering the surface of the core section. The core section is made of an alloy containing a first metal and a second metal. The shell section is made of an alloy which contains the first metal and the second metal and which has a first metal-to-second metal content ratio different from that of the core section. The first metal is a magnetic metal and has a standard redox potential higher than that of the second metal. The neighboring core-shell structure particles are linearly linked to each other.

First claim

What is claimed is:

1. A magnetic structural body comprising:
core-shell structure particles, each including a core section and a shell section covering the surface of the core section,
wherein the core section is made of an alloy containing a first metal and a second metal,
the shell section is made of an alloy which contains the first metal and the second metal and which has a first metal-to-second metal content ratio different from that of the core section,
the first metal is a magnetic metal and has a standard redox potential higher than that of the second metal, and
the neighboring core-shell structure particles are linearly linked to each other.

2. The magnetic structural body according to claim 1 , wherein
the core section is substantially spherical.

3. The magnetic structural body according to claim 1 , wherein
in the neighboring core-shell structure particles, the core sections of each of the core-shell structure particles are linked to each other and the shell sections are linked to each other.

4. The magnetic structural body according to claim 3 , wherein
the contact area between the shell sections in the contact plane between the neighboring core-shell structure particles is larger than the contact area between the core sections.

5. The magnetic structural body according to claim 1 , wherein
an average concentration of the first metal in the core sections is higher than an average concentration of the first metal in the shell sections.

6. The magnetic structural body according to claim 1 , wherein
an average concentration of the second metal in the shell sections is higher than an average concentration of the second metal in the core sections.

7. The magnetic structural body according to claim 1 , wherein
the core sections and the shell sections are made of an amorphous alloy.

8. The magnetic structural body according to claim 1 , wherein
the first metal is cobalt or nickel and the second metal is iron.

9. The magnetic structural body according to claim 1 , wherein
the core-shell structure particles contain phosphorus and an average concentration of phosphorus in the core sections is higher than an average concentration of phosphorus in the shell sections.

10. The magnetic structural body according to claim 1 , wherein
the core-shell structure particles contain boron.

11. The magnetic structural body according to claim 1 , wherein
a molar ratio of the first metal to second metal in the core sections is from 1 to 3.

12. The magnetic structural body according to claim 1 , wherein
the core-shell structure particles contain none of phosphorus and boron.

13. The magnetic structural body according to claim 1 , wherein
the first metal is cobalt and the second metal is iron.

14. The magnetic structural body according to claim 1 , wherein
a molar ratio of the first metal to second metal in the magnetic structural body is from 4 to 9.

15. The magnetic structural body according to claim 1 , wherein
the core sections have a hexagonal close-packed structure phase.

16. The magnetic structural body according to claim 2 , wherein
in the neighboring core-shell structure particles, the core sections of each of the core-shell structure particles are linked to each other and the shell sections are linked to each other.

17. The magnetic structural body according to claim 2 , wherein
an average concentration of the first metal in the core sections is higher than an average concentration of the first metal in the shell sections.

18. The magnetic structural body according to claim 2 , wherein
an average concentration of the second metal in the shell sections is higher than an average concentration of the second metal in the core sections.

19. The magnetic structural body according to claim 2 , wherein
the core sections and the shell sections are made of an amorphous alloy.

20. The magnetic structural body according to claim 2 , wherein
the first metal is cobalt or nickel and the second metal is iron.

Assignees

• Murata Manufacturing Co

Inventors

• Chiku Shinichiro
• Sekijima Takenori

Classifications

• H01F1/143 Primary

  in the form of wires (H01F1/147 takes precedence) · CPC title

• B22F1/0547

  Nanofibres or nanotubes · CPC title

• B22F1/065

  Spherical particles · CPC title

• B22F1/08

  Metallic powder characterised by particles having an amorphous microstructure · CPC title

• B22F1/17

  Metallic particles coated with metal · CPC title