IP Library › Granted Patent US 10,049,796
Granted Patent B2
US 10,049,796 · App. 14/887,680 · Granted Aug 14, 2018

Magnetodielectric Y-phase strontium hexagonal ferrite materials formed by sodium substitution

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Quick Facts
Patent No.
US 10,049,796
App. No.
14/887,680
Granted
Aug 14, 2018
Kind
B2
Abstract

Disclosed herein are embodiments of an enhanced resonant frequency hexagonal ferrite material and methods of manufacturing. The hexagonal ferrite material can be Y-phase strontium hexagonal ferrite material. In some embodiments, sodium can be added into the crystal structure of the hexagonal ferrite material in order to achieve high resonance frequencies while maintaining high permeability.

Claims (24)

1. A magnetodielectric hexagonal ferrite comprising:

a Y-phase strontium hexagonal ferrite material having sodium substituted for strontium and including a trivalent or tetravalent ion to form a magnetodielectric hexagonal ferrite, the composition of the magnetodielectric hexagonal ferrite being Sr 2-x Na x Co 2-x M x Fe 12 O 22 when a trivalent ion is used, where M is a trivalent ion, and the composition of the magnetodielectric hexagonal ferrite being Sr 2-2x Na 2x Co 2x N x Fe 12 O 22 when a tetravalent ion is used, where N is a tetravalent ion, x being from 0<x≤ about 1.5 in the trivalent substitution and from 0<x≤ about 0.75 in the tetravalent substitution.

2. The hexagonal ferrite of claim 1 wherein M is selected from the group consisting of Al, Ga, Sc, Cr, Mn, In, Yb, Er, Y or other lanthanide.

3. The hexagonal ferrite of claim 1 wherein N is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, or Tb.

4. The hexagonal ferrite of claim 1 wherein a trivalent ion is used.

5. The hexagonal ferrite of claim 1 wherein a tetravalent ion is used.

6. The hexagonal ferrite of claim 1 wherein the magnetodielectric hexagonal ferrite has the composition Sr 1.75 Na 0.25 Co 1.75 M 0.25 Fe 12 O 22 .

7. The hexagonal ferrite of claim 1 wherein the magnetodielectric hexagonal ferrite has the composition Sr 1.5 Na 0.5 Co 1.5 M 0.5 Fe 12 O 22 .

8. The hexagonal ferrite of claim 1 wherein the loss factor of the magnetodielectric hexagonal ferrite remains below 4 at frequencies up to 1 GHz.

9. The hexagonal ferrite of claim 1 wherein the magnetodielectric hexagonal ferrite has a permeability of between around 5 and around 6 up to 1 GHz.

10. A method for improving magnetic properties of a hexagonal ferrite material, the method comprising:

substituting sodium into a Y-phase strontium hexagonal ferrite material for strontium; and

charge balancing either using a trivalent or tetravalent ion to form a magnetodielectric hexagonal ferrite, the composition of the magnetodielectric hexagonal ferrite being Sr 2-x Na x Co 2-x M x Fe 12 O 22 when a trivalent ion is used, where M is a trivalent ion, and the compositions of the magnetodielectric hexagonal ferrite being Sr 2-2x Na 2x Co 2x N x Fe 12 O 22 when a tetravalent ion is used, where N is a tetravalent ion, x being from 0<x≤about 1.5 in the trivalent substitution and from 0<x≤about 0.75 in the tetravalent substitution.

11. The method of claim 10 wherein the magnetodielectric hexagonal ferrite has the composition Sr 1.75 Na 0.25 Co 1.75 M 0.25 Fe 12 O 22 .

12. The method of claim 10 wherein the magnetodielectric hexagonal ferrite has the composition Sr 1.5 Na 0.5 Co 1.5 M 0.5 Fe 12 O 22 .

13. The method of claim 10 wherein the loss factor of the magnetodielectric hexagonal ferrite remains below 4 at frequencies up to 1 GHz.

14. The method of claim 10 wherein the magnetodielectric hexagonal ferrite has a permeability of between around 5 and around 6 up to 1 GHz.

15. A magnetodielectric antenna comprising:

a Y-phase strontium hexagonal ferrite material having sodium substituted for strontium and including a trivalent or tetravalent ion to form a magnetodielectric hexagonal ferrite, the composition of the magnetodielectric hexagonal ferrite being Sr 2-x Na x Co 2-x M x Fe 12 O 22 when a trivalent ion is used, where M is a trivalent ion, and the composition of the magnetodielectric hexagonal ferrite being Sr 2-2x Na 2x Co 2x N x Fe 12 O 22 when a tetravalent ion is used, where N is a tetravalent ion, x being from 0<x≤1.5 in the trivalent substitution and from 0<x≤about 0.75 in the tetravalent substitution.

16. The magnetodielectric antenna of claim 15 wherein the magnetodielectric hexagonal ferrite has the composition Sr 1.75 Na 0.25 Co 1.75 M 0.25 Fe 12 O 22 .

17. The magnetodielectric antenna of claim 15 wherein the magnetodielectric hexagonal ferrite has the composition Sr 1.5 Na 0.5 Co 1.5 M 0.5 Fe 12 O 22 .

18. The magnetodielectric antenna of claim 15 wherein the loss factor of the magnetodielectric hexagonal ferrite remains below 4 at frequencies up to 1 GHz.

19. The magnetodielectric antenna of claim 15 wherein the magnetodielectric hexagonal ferrite has a permeability of between around 5 and around 6 up to 1 GHz.

20. A radiofrequency device incorporating the hexagonal ferrite of claim 1 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 11, 2016
From: HILL, MICHAEL DAVID
To: SKYWORKS SOLUTIONS, INC.
Reel/Frame 037719/0571 →