Magnetic laminate, magnetic structure including same, electronic component including magnetic laminate or magnetic structure, and method for producing magnetic laminate

Patent metadata

Field	Value
Publication number	US-11798725-B2
Application number	US-202016925208-A
Country	US
Kind code	B2
Filing date	Jul 9, 2020
Priority date	Jul 12, 2019
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A magnetic laminate having further suppressed magnetic saturation and higher DC superposition characteristics, a magnetic structure including the same, and an electronic component including the magnetic laminate or the magnetic structure. A magnetic laminate in which magnetic metal layers and non-magnetic metal layers are alternately laminated, wherein the non-magnetic metal layer is disposed between the magnetic metal layers; the magnetic metal layer contains an amorphous material; and the non-magnetic metal layer contains at least one element selected from the group consisting of Cr, Ru, Rh, Ir, Re, and Cu, and has an average thickness of 0.4 nm or more and 1.5 nm or less (i.e., from 0.4 nm to 1.5 nm).

First claim

What is claimed is:

1. A magnetic laminate in which magnetic metal layers and a non-magnetic metal layer are alternately laminated,
the non-magnetic metal layer being disposed between the magnetic metal layers,
at least one of the magnetic metal layers containing an amorphous material, and
the non-magnetic metal layer containing at least one element selected from the group consisting of Cr, Ru, Rh, Ir, Re, and Cu, and having an average thickness of from 0.4 nm to 1.5 nm,
wherein the amorphous material has a composition represented by the general formula Fe 100-a-b-c M a P b Cu c ,
wherein:
M is at least one element selected from the group consisting of Si, B, and C; and
a, b, and c are such that molar parts of the elements: 0.5≤a≤20, 1≤b≤10, and 0.1≤c≤1.5 are set when the entire composition represented by the general formula is 100 molar parts.

2. A magnetic laminate in which magnetic metal layers and a non-magnetic metal layer are alternately laminated,
the non-magnetic metal layer being disposed between the magnetic metal layers;
at least one of the magnetic metal layers containing an amorphous material; and
the magnetic metal layers being coupled in an antiparallel manner with the non-magnetic metal layer interposed therebetween,
wherein at amorphous material has a composition represented by the general formula Fe 100-a-b-c M a P b Cu c ,
wherein:
M is at least one element selected from the group consisting of Si, B, and C; and
a, b, and c are such that molar parts of the elements: 0.5≤a≤20, 1≤b≤10, and 0.1≤c≤1.5 are set when the entire composition represented by the general formula is 100 molar parts.

3. The magnetic laminate according to claim 1 , wherein at least one of the magnetic metal layers further contains nanocrystalline grains dispersed in the amorphous material.

4. The magnetic laminate according to claim 1 , wherein at least one of the magnetic metal layers is made of only the amorphous material.

5. The magnetic laminate according to claim 1 , wherein each of the magnetic metal layers has an average thickness of 100 nm or less.

6. A magnetic structure in which magnetic layers and at least one insulating layer are alternately laminated,
the insulating layer being disposed between the magnetic layers, and
the magnetic layer being the magnetic laminate according to claim 1 .

7. The magnetic structure according to claim 6 , wherein the insulating layer contains at least one selected from the group consisting of aluminum oxide, silicon oxide, aluminum nitride, silicon nitride, magnesium oxide, and zirconium oxide.

8. An electronic component comprising the magnetic laminate according to claim 1 .

9. The electronic component according to claim 8 , further comprising a coil conductor,
wherein:
the magnetic laminate or the magnetic structure is located inside a winding part of the coil conductor; and
a winding axis direction of the coil conductor is substantially perpendicular to a lamination direction of the magnetic laminate or the magnetic structure.

10. The electronic component according to claim 9 , wherein the magnetic laminate or the magnetic structure is annular.

11. The electronic component according to claim 9 , wherein the electronic component is a thin film inductor.

12. A method for producing a magnetic laminate according to claim 1 , the method comprising
alternately forming amorphous magnetic metal materials and non-magnetic metal materials according to a thin film forming method, to form a magnetic laminate in which magnetic metal layers and non-magnetic metal layers are alternately laminated, and the non-magnetic metal layer is disposed between the magnetic metal layers.

13. The method for producing a magnetic laminate according to claim 12 , further comprising subjecting the magnetic laminate to a heat treatment.

14. The magnetic laminate according to claim 2 , wherein at least one of the magnetic metal layers further contains nanocrystalline grains dispersed in the amorphous material.

15. The magnetic laminate according to claim 2 , wherein at least one of the magnetic metal layers is made of only the amorphous material.

16. The magnetic laminate according to claim 2 , wherein each of the magnetic metal layers has an average thickness of 100 nm or less.

17. A magnetic structure in which magnetic layers and insulating layers are alternately laminated,
at least one of the insulating layer being disposed between the magnetic layers, and
the magnetic layers being the magnetic laminate according to claim 2 .

18. An electronic component comprising the magnetic structure according to claim 6 .

Assignees

• Murata Manufacturing Co

Inventors

• Komagaki Kojiro
• Sakaguchi Kenji

Classifications

• H01F27/245 Primary

  made from sheets, e.g. grain-oriented (H01F27/26 takes precedence) · CPC title

• H01F1/153

  Amorphous metallic alloys, e.g. glassy metals {(making ferrous amorphous alloys C22C33/003)} · CPC title

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F41/0233

  Manufacturing of magnetic circuits made from sheets (magnetic cores made from sheets H01F27/245; soft magnetic alloys in the form of sheets H01F1/16) · CPC title

• H01F17/04 Primary

  with magnetic core · CPC title