Composite hexagonal ferrite materials
Disclosed herein are embodiments of composite hexagonal ferrite materials formed from a combination of Y phase and Z phase hexagonal ferrite materials. Advantageously, embodiments of the material can have a high resonant frequency as well as a high permeability. In some embodiments, the materials can be useful for magnetodielectric antennas.
1. A composite hexagonal ferrite material comprising:
a base y-phase hexagonal ferrite composition having a formula Sr 2-2x Na 2x Zr x Co 2-x Fe 12 O 22 or Sr 2-x Na x In x Co 2-x Fe 12 O 22 , 0<x<1; and
a doped-in z-phase hexagonal ferrite composition to form the composite hexagonal ferrite material, the doped-in z-phase hexagonal ferrite composition having a formula Sr 3-x′-y′ Ba x′ Na y′ Co 2-y′ In y′ Fe 24 O 41 , 0<x′<3 and 0<y′<1.
2. An antenna formed from the composite hexagonal ferrite material of claim 1 .
3. A composite hexagonal ferrite material comprising:
a base y-phase hexagonal ferrite composition, the base y-phase hexagonal ferrite composition having a formula Sr 2-x′ Na x′ In x′ Co 2-x′ Fe 12 O 22 , 0<x′<1; and
a doped-in z-phase hexagonal ferrite composition to form the composite hexagonal ferrite material, the doped-in z-phase hexagonal ferrite composition having a formula Sr 3-x-2y Ba x′ Na 2y Co 2-y Zr y Fe 24 O 41 or Sr 3-x-y Ba x Na y Co 2-y In y Fe 24 O 41 , 0<x<3, and 0<y<1.
4. An antenna formed from the composite hexagonal ferrite material of claim 3 .
5. A composite hexagonal ferrite material comprising:
a base y-phase hexagonal ferrite composition having a formula Sr 2-x Na x Co 2-x Sc x Fe 12 O 22 , 0<x<1; and
a doped-in z-phase hexagonal ferrite composition to form the composite hexagonal ferrite material, the doped-in z-phase hexagonal ferrite composition having a formula Sr 3-x-y Ba x Na y Co 2-y Sc y Fe 24 O 41 , 0<x<3, 0<y<1.5.
6. The composite hexagonal ferrite material of claim 5 wherein the composite hexagonal ferrite material includes two phases.
7. The composite hexagonal ferrite material of claim 5 wherein the composite hexagonal ferrite material has a real permeability of between 3 and 7 at 1 GHz.
8. The composite hexagonal ferrite material of claim 5 wherein the composite hexagonal ferrite material has a real permeability of greater than 6 at 1 GHz.
9. The composite hexagonal ferrite material of claim 5 wherein the y-phase hexagonal ferrite composition includes Sr 1.6 Na 0.4 Sc 0.4 Co 1.6 Fe 12 O 22 .
10. The composite hexagonal ferrite material of claim 5 wherein the doped-in z-phase hexagonal ferrite composition includes Ba 1.4 Sr 0.8 Na 0.8 Sc 0.8 Co 1.2 Fe 12 O 22 .
11. A composite hexagonal ferrite material comprising:
a base y-phase hexagonal ferrite composition having a formula Sr 2-x Na x In x Co 2-x Fe 12 O 22 , 0<x<1; and
a doped-in z-phase hexagonal ferrite composition to form the composite hexagonal ferrite material.
12. A composite hexagonal ferrite material comprising:
a base y-phase hexagonal ferrite composition; and
a doped-in z-phase hexagonal ferrite composition to form the composite hexagonal ferrite material, the doped-in z-phase hexagonal ferrite composition having a formula Sr 3-x-y Ba x Na y Co 2-y In y Fe 24 O 41 , 0<x<3, and 0<y<1.
13. The antenna of claim 2 wherein the antenna is part of a wireless device.
14. The antenna of claim 4 wherein the antenna is part of a wireless device.
15. An antenna formed from the composite hexagonal ferrite material of claim 5 .
16. The antenna of claim 15 wherein the antenna is part of a wireless device.
17. An antenna formed from the composite hexagonal ferrite material of claim 11 .
18. The antenna of claim 17 wherein the antenna is part of a wireless device.
19. An antenna formed from the composite hexagonal ferrite material of claim 12 .
20. The antenna of claim 19 wherein the antenna is part of a wireless device.