In order to improve the electromagnetic properties of 80wt%NiCuZn + 20wt% CaCu3Ti4O12 composites, Co2O3 as an additive was studied in this work. The effects of Co2O3 content on the electromagnetic properties were investigated, which confirmed that permeability of composites was decreased and cut-off frequency was improved with Co2O3. The nonlinear fitting of permeability dispersion have revealed the relationships between domain wall resonance, spin rotation relaxion mechanisms, and local induced anisotropy, the existence of local induced anisotropy caused by ordering of Co ions could influence the initial permeability. Meanwhile, the dielectric constant was increased with the addition of Co2O3, and all the samples kept a lower tanδ,which was less than 0.01 at the frequency between 107Hz to 108Hz.
View full abstract