Study on microwave properties of low temperature fired NiZnCu gyromagnetic ferrite

This paper describes the microwave properties of low temperature fired $Ni0.6CuxZn(0.4−x)Fe1.96+δO4$ gyromagnetic ferrite material synthesized by conventional oxide process with $Bi2O3$ additives. It is found that $60–63mol%$ Ni and $5mol%$ Cu contents have the advantage to keep the material with both low-fired characteristic and high saturated magnetization with $3wt%$ $Bi2O3$ additives. Considering the conditions of milling, calcination, and sintering process, the low temperature fired NiCuZn gyromagnetic material was prepared with excellent microwave performances. The saturated magnetization $Ms$ of the sample is 337 kA/m, the ferromagnetic resonance linewidth $ΔH$ and dielectric loss $tgδε$ less than 16 kA/m and $5.7×10−4$⁠, respectively, which has the potential applications for low temperature cofired ceramics technology to develop microwave chip circulator/isolator and passive integrated substrate.