Magnetic composites, method of making the same, and antenna device comprising the magnetic composites

Patent metadata

Field	Value
Publication number	US-2017278603-A1
Application number	US-201615338649-A
Country	US
Kind code	A1
Filing date	Oct 31, 2016
Priority date	Mar 28, 2016
Publication date	Sep 28, 2017
Grant date	—

Abstract

A magnetic composite includes a polymeric substrate and a magnetic material including a Z-type phase and represented by the following Chemical Formula:
Ba 1.5-x Sr 1.5-x Ca 2x M 2 Fe 24 O 41   Chemical Formula

wherein, in the Chemical Formula, M is at least one selected from Co, Ni, Cu, Mg, Mn, Ti, Al, Zn, and Zr, and 0≦x<0.3.

First claim

What is claimed is:

1 . A magnetic composite comprising:
a polymeric substrate; and a magnetic material comprising a Z-type phase and represented by the following Chemical Formula,
Ba 1.5-x Sr 1.5-x Ca 2x M 2 Fe 24 O 41   Chemical Formula

wherein, in the Chemical Formula, M is at least one selected from Co, Ni, Cu, Mg, Mn, Ti, Al, Zn, and Zr, and 0≦x<0.3.

2 . The magnetic composite of claim 1 , wherein the magnetic material consists of a Z-type single phase.

3 . The magnetic composite of claim 1 , wherein the magnetic material comprises a sheet-shaped particle, and
wherein a ratio of a length of a major axis of the sheet-shaped particle to a thickness of the sheet-shaped particle is greater than or equal to about 4.

4 . The magnetic composite of claim 3 , wherein the length of the major axis of the sheet-shaped particle is greater than 0 micrometer and less than or equal to about 50 micrometers.

5 . The magnetic composite of claim 1 , wherein the magnetic material has a dielectric loss tangent of less than or equal to about 0.006 at a frequency band of about 400 megahertz to about 800 megahertz.

6 . The magnetic composite of claim 1 , wherein the magnetic material has a magnetic loss tangent of less than or equal to about 0.05 at a frequency band of about 400 megahertz to about 800 megahertz.

7 . The magnetic composite of claim 1 , wherein the magnetic material has a ratio of a permeability to a dielectric constant of greater than or equal to about 0.28 at a frequency band of about 400 megahertz to about 800 megahertz.

8 . The magnetic composite of claim 1 , wherein a magnetic saturation of the magnetic material is less than or equal to about 64 electromagnetic units per gram.

9 . The magnetic composite of claim 1 , wherein the magnetic material is dispersed in the polymer substrate.

10 . The magnetic composite of claim 1 , wherein the magnetic material is present in an amount of greater than or equal to about 50 weight percent, based on a total weight of the magnetic composite.

11 . A method of making the magnetic composite of claim 1 , the method comprising:
calcining an iron containing precursor at a temperature of about 1000° C. to about 1200° C. to obtain a calcinated precursor; mixing the calcinated precursor with a metal salt to obtain a precursor-metal salt mixture; sintering the precursor-metal salt mixture at a temperature of about 1100° C. to about 1300° C.; removing the metal salt from the sintered precursor-metal salt mixture to obtain the magnetic material; and contacting the magnetic material with a polymer resin to obtain the magnetic composite.

12 . The method of claim 11 , wherein the metal salt comprises at least one metal selected from Na, K, Ca, Mg, Sr, Ba, Al, Sc, Ti, V, Cr, Cu, Zn, Zr, Nb, Mo, and Ag.

13 . The method of claim 11 , wherein the metal salt includes at least one salt selected from a chloride, a hydroxide, a nitrate, an acetate, a propionate, an acetylacetonate, a methoxide, an ethoxide, a phosphate, a C1 to C10 alkylphosphate, a perchloride, a sulfate, a C1 to C10 alkylsulfonate, and a C1 to C10 alkyl bromide.

14 . The method of claim 11 , wherein a mass ratio of the precursor to the metal salt in the precursor-metal salt mixture is about 2:1 to about 1:2.

15 . The method of claim 11 , wherein the method comprises mixing the magnetic material and the polymer resin to obtain a magnetic material-polymer composite resin.

16 . The method of claim 15 , wherein the method further comprises curing the magnetic material-polymer composite resin.

17 . An antenna comprising the magnetic composite of claim 1 .

Assignees

• Samsung Electronics Co Ltd

Inventors

• Moon Kyoung-Seok
• Lee Sang Eui
• Kang Young Min
• Kim Dong Hun
• Kim Min Seok
• Sohn Hiesang
• Han In Taek

Classifications

• H01F1/0551 Primary

  in the form of particles, e.g. rapid quenched powders or ribbon flakes · CPC title

• H01F41/0253

  for manufacturing permanent magnets · CPC title

• H01Q1/36

  Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence) · CPC title

• H01F1/37

  in a bonding agent · CPC title

• H01Q17/004

  using non-directional dissipative particles, e.g. ferrite powders (H01Q17/005 takes precedence; flake-like H01Q17/002) · CPC title