Increased resonant frequency potassium-doped hexagonal ferrite
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, strontium can be substituted out for a trivalent or tetravalent ion composition including potassium, thereby providing for advantageous properties.
1. A doped Y-phase hexagonal ferrite material, comprising:
a doped Y-phase hexagonal ferrite material including potassium substituted for at least some strontium and including a trivalent ion substituted for at least some cobalt, the doped Y-phase hexagonal ferrite material having a composition Sr 2−x K x Co 2−x M x Fe 12 O 22 , M being the trivalent ion and the value of x being 0.2<x<0.7.
2. The material of claim 1 wherein M is selected from the group consisting of Sc, Mn, In, Cr, Ga, Co, Ni, Fe, Yb, and any of the lanthanide ions.
3. The material of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.75 K 0.25 Co 1.75 Sc 0.25 Fe 12 O 22 .
4. The material of claim 3 wherein a loss factor of the doped Y-phase hexagonal material is below 0.5 at 1 GHz.
5. The material of claim 3 wherein a permeability of the doped Y-phase hexagonal material is greater than 3.
6. The material of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.5 K 0.5 Co 1.5 Sc 0.5 Fe 12 O 22 .
7. The material of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.75 K 0.25 Co 1.75 In 0.25 Fe 12 O 22 .
8. The material of claim 7 wherein a loss factor of the doped Y- phase hexagonal material is below 0.5 at 1 GHz.
9. The material of claim 7 wherein a permeability of the doped Y-phase hexagonal material is greater than 3.
10. The material of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 .
11. The material of claim 1 wherein the doped Y-phase hexagonal material has a loss factor of below 1 at 1 GHz.
12. A radio frequency antenna including the material of claim 1 .
13. A radio frequency device including the material of claim 1 .
14. A radio frequency antenna, comprising:
a doped Y-phase hexagonal ferrite material including potassium substituted for at least some strontium and including a trivalent ion substituted for at least some cobalt, the doped Y-phase hexagonal ferrite material having a composition Sr 2−x K x Co 2−x M x Fe 12 O 22 , being the trivalent ion and the value of x being 0<x≤1.5.
15. A doped Y-phase hexagonal ferrite material, comprising:
a doped Y-phase hexagonal ferrite material including potassium substituted for at a doped Y-phase hexagonal ferrite material including potassium substituted for at least some strontium and including a tetravalent ion substituted for at least some cobalt, the doped Y-phase hexagonal ferrite material having a composition Sr 2−2x K 2x Co 2−x N x Fe 12 O 22 , N being the tetravalent ion and the value of x being 0.2<x<0.5.
16. The material of claim 15 wherein N is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, and Tb.
17. The material of claim 15 wherein N is Ge.
18. The material of claim 15 wherein the doped Y-phase hexagonal ferrite material has a loss factor below 1 at 1 GHz.
19. A radio frequency antenna including the material of claim 15 .
20. A radio frequency device including the material of claim 15 .
21. A radio frequency antenna, comprising:
a doped Y-phase hexagonal ferrite material including potassium substituted for at least some strontium and including a tetravalent ion substituted for at least some cobalt, the doped Y-phase hexagonal ferrite material having a composition Sr 2−2x K 2x Co 2−x N x Fe 12 O 22 , N being the tetravalent ion and the value of x being 0<x≤0.75.