Influence of Co₂O₃ additive on electromagnetic properties of NiCuZn/CaCu₃Ti₄O₁₂ composites

Abstract

In order to improve the electromagnetic properties of 80wt%NiCuZn + 20wt% CaCu 3 Ti 4 O 12 composites, Co 2 O 3 as an additive was studied in this work. The effects of Co 2 O 3 content on the electromagnetic properties were investigated, which confirmed that permeability of composites was decreased and cutoff frequency was improved with Co 2 O 3. 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 Co 2 O 3 , and all the samples kept a lower tanδ，which was less than 0.01 at the frequency between 10 7 Hz to 10 8 Hz.