Oriented body containing e-iron oxide, method for producing the same, and device for producing the same

Patent metadata

Field	Value
Publication number	US-2017349448-A1
Application number	US-201615544147-A
Country	US
Kind code	A1
Filing date	Jan 18, 2016
Priority date	Jan 19, 2015
Publication date	Dec 7, 2017
Grant date	—

Abstract

There are provided an oriented body such as a magnetic sheet in which a value of degree of orientation of magnetic particles is beyond 3.5, and a method for producing the same, and a device for producing the same, wherein the oriented body such as a magnetic sheet is produced through the steps of: mixing a mixed solution containing a solvent and a vehicle and ε-iron oxide particles by shaking stirring, and dispersing the ε-iron oxide particles in the mixed solution; providing a mixed solution in which the ε-iron oxide particles are dispersed, on a predetermined substrate; and removing the solvent while applying a magnetic field to the substrate provided with the mixed solution, to obtain an oriented body.

First claim

1 . An oriented body containing s iron oxide particles as magnetic particles, wherein the degree of orientation of magnetic particles defined by “degree of orientation=SQ (direction of magnetization easy-axes)/SQ (direction of magnetization hard-axes)”, is beyond 3.5.

2 . A method for producing an oriented body containing s iron oxide, comprising:
mixing a mixed solution containing a solvent and a vehicle and ε-iron oxide particles by shaking stirring, and dispersing the ε-iron oxide particles in the mixed solution; providing a mixed solution in which the ε-iron oxide particles are dispersed, on a predetermined substrate; and removing the solvent while applying a magnetic field to the substrate provided with the mixed solution, to obtain an oriented body.

3 . The method for producing an oriented body according to the claim 2 , wherein a value of a magnetic flux density of the magnetic field is 2 Tesla or more.

4 . A production device for performing the method for producing the oriented body containing ε iron oxide of claim 2 , having:
a dispersing function of mixing a mixed solution containing a solvent and a vehicle and ε-iron oxide particles by shaking stirring, and dispersing the ε-iron oxide particles in the mixed solution;
a coating function of providing a mixed solution in which the ε-iron oxide particles are dispersed, on a predetermined substrate; and
a magnetic field application function of removing the solvent while applying a magnetic field to the mixed solution in which the ε-iron oxide particles are dispersed.

5 . A production device for performing the method for producing the oriented body containing c iron oxide of claim 3 , having:
a dispersing function of mixing a mixed solution containing a solvent and a vehicle and ε-iron oxide particles by shaking stirring, and dispersing the ε-iron oxide particles in the mixed solution; a coating function of providing a mixed solution in which the ε-iron oxide particles are dispersed, on a predetermined substrate; and a magnetic field application function of removing the solvent while applying a magnetic field to the mixed solution in which the ε-iron oxide particles are dispersed.

Assignees

• Univ Tokyo
• Dowa Electronics Materials Co Ltd

Inventors

• Ohkoshi Shin-Ichi
• Tokoro Hiroko
• Nakabayashi Koji
• Namai Asuka
• Imoto Kenta
• Masada Kenji

Classifications

• H01F41/16

  the magnetic material being applied in the form of particles, e.g. by serigraphy {, to form thick magnetic films or precursors therefor} (H01F41/18 {-H01F41/24} take precedence) · CPC title

• H01F1/113

  in a bonding agent · CPC title

• H01F1/11

  in the form of particles {(for magnetic record carriers G11B5/70626)} · CPC title

• G11B5/845

  in a magnetic field · CPC title

• G11B5/706

  characterised by the composition of the magnetic material · CPC title