Spinel ferrite based composites with permeability and permittivity of almost equal values

摘要

This paper reports on our recent attempt to prepare composites with permeability and permittivity of almost equal values for low frequency applications. The composites were based on spinel ferrites with composition of Ni_(0.75-x)Co_xZn_(0.25)Fe_(1.90)Mn_(0.02)O_4 (x=0, 0.05, and 0.10). The ferrite powders were synthesized via the conventional solid-state reaction process. The composites were fabricated using epoxy as matrix. For all samples of the fabricated composites, the permittivity remains almost the same, while the permeability can be varied through doping of cobalt in the spinel ferrites.