Enhanced hexagonal ferrite material and methods of preparation thereof
AssigneeSkyworks Solutions, Inc.
InventorMichael D. Hill
Life of this patent
Estimating the term…
Abstract
Embodiments and aspects of the present invention relate to an enhanced hexagonal ferrite magnetic material doped with an alkali metal. The material retains substantial magnetic permeability up to frequencies in the GHz range with low losses. The material may be used in high frequency applications in devices such as transformers, inductors, circulators, and absorbers.
Claims20
An alkali metal-doped hexaferrite having the formula Ba3-yMxCo2Fe24O41 where Ba is barium, M is at least one of potassium and rubidium, Co is cobalt, Fe is iron, O is oxygen, x is greater than zero and less than one, and y is greater than zero and less than or equal to x.
A method of producing a hexaferrite comprising:
- providing a precursor mixture comprising a barium source, a cobalt source, and an iron source;
- introducing an alkali metal source to the precursor mixture to produce an alkali metal containing mixture;
- and
- heating the alkali metal containing mixture at a first temperature of at least about 1100° C. for a first period of time sufficient to form hexaferrite particles having the formula Ba3-yMxCo2Fe24O41 where Ba is barium, M is at least one of potassium and rubidium, Co is cobalt, Fe is iron, O is oxygen, x is greater than zero and less than one, and y is greater than zero and less than or equal to x.
A method of producing a hexaferrite comprising:
- providing a mixture comprising a barium source, a cobalt source, and an iron source;
- calcining the mixture at a temperature that is at least about 1100° C. for a period of time sufficient to form hexaferrite particles;
- and
- introducing an alkali metal to the hexaferrite particles in an amount sufficient to provide doped hexaferrite having the formula Ba3-yMxCo2Fe24O41 where Ba is barium, M is at least one of potassium and rubidium, Co is cobalt, Fe is iron, O is oxygen, x is greater than zero and less than one, and y is greater than zero and less than or equal to x.
Dependencies are inferred from the claim text.