Compositions and materials for electronic applications

摘要

Embodiments disclosed herein relate to using cobalt (Co) to fine tune the magnetic properties, such as permeability and magnetic loss, of nickel-zinc ferrites to improve the material performance in electronic applications. The method comprises replacing nickel (Ni) with sufficient Co+2 such that the relaxation peak associated with the Co+2 substitution and the relaxation peak associated with the nickel to zinc (Ni/Zn) ratio are into near coincidence. When the relaxation peaks overlap, the material permeability can be substantially maximized and magnetic loss substantially minimized. The resulting materials are useful and provide superior performance particularly for devices operating at the 13.56 MHz ISM band.

主权项

1. An RF device comprising:
a composition represented by the formula
Ni1-w-x-y-zZnwCoxMnyCuzFe2-aO4-1.5a, w being greater than or equal to 0.2 and less than or equal to 0.6; x being greater than or equal to 0 and less than or equal to 0.2; y being greater than or equal to 0 and less than or equal to 0.2; z being greater than or equal to 0 and less than or equal to 0.2; a being greater than or equal to 0 and less than or equal to 0.2; and said RF device operates in the 13.56 MHz band.