Metal magnetic film and magnetic sheet

Patent metadata

Field	Value
Publication number	US-11765874-B2
Application number	US-202016932046-A
Country	US
Kind code	B2
Filing date	Jul 17, 2020
Priority date	Sep 27, 2018
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A method of forming a metal magnetic film includes forming the metal magnetic film by a plating process, wherein the metal magnetic film comprises a permalloy and carbon atoms and a content of the carbon atoms is 0.3 to 3.0 at % based on a total amount of the carbon atoms and metal elements.

First claim

What is claimed is:

1. A method of forming a metal magnetic film, comprising:
forming the metal magnetic film by a plating process, wherein:
the metal magnetic film comprises a permalloy and carbon atoms;
a content of the carbon atoms is 1.0 to 3.0 at % based on a total amount of the carbon atoms and metal elements; and
a thickness of the metal magnetic film is 1 to 10 μm.

2. The method according to claim 1 , wherein:
the metal magnetic film is formed on a support by an electroplating process so as to produce a magnetic sheet; and
the electroplating process comprises dipping the support in an electroplating bath containing compounds that provide ions of the metal elements and a compound that is a carbon source.

3. The method according to claim 2 , wherein the support comprises a non-magnetic metal layer, and a resin layer provided on a surface of the non-magnetic metal layer on an opposite side to the metal magnetic film.

4. The method according to claim 2 , wherein the magnetic sheet is a noise suppression sheet.

5. The method according to claim 2 , wherein a content of the compounds that provide ions of the metal elements in the electroplating bath is 1 to 400 g/L.

6. The method according to claim 2 , wherein a content of the compound that is a carbon source in the electroplating bath is 0.1 to 5.0 g/L.

7. The method according to claim 2 , wherein:
the electroplating process uses a current density of 0.5 to 5 A/dm 2 ;
the support is dipped in the electroplating bath for 5 to 90 minutes; and
the electroplating bath has a temperature of 35 to 50° C. and a pH of 2 to 3.

8. The method according to claim 2 , wherein the support comprises a pressure-sensitive adhesive layer, a non-magnetic metal layer, and a resin layer provided on a surface of the non-magnetic metal layer on an opposite side to the metal magnetic film.

9. The method according to claim 1 , wherein the permalloy contains iron (Fe) and nickel (Ni) in a mass ratio of Fe to Ni (Fe/Ni) that is from 15 to 40.

10. The method according to claim 1 , wherein the permalloy contains iron (Fe) and nickel (Ni) in a mass ratio of Fe to Ni (Fe/Ni) that is from 18 to 25.

Assignees

• Tdk Corp

Inventors

• Yamada Takashi
• Yanagida Miyuki
• Sato Atsushi
• Kawabata Kenichi

Classifications

• H01F10/12 Primary

  being metals or alloys (intermetallic compounds H01F10/18) · CPC title

• H05K9/0088 Primary

  comprising a plurality of shielding layers; combining different shielding material structure · CPC title

• H05K9/0075 Primary

  Magnetic shielding materials · CPC title

• H05K9/0083 Primary

  comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers (H05K9/0086 takes precedence) · CPC title

• H01F10/14

  containing iron or nickel ({H01F10/126} , H01F10/13, H01F10/16 take precedence) · CPC title