In this work, the high permeability MnZn ferrites for the MHz frequency and broad-temperature applications have been successfully developed by adding the additives Co3O4 and V2O5. The addition of Co3O4 promotes the formation of broad-temperature characteristics of initial permeability \(\mu_{i}\) in MnZn ferrites. This is due to that the positive magnetocrystalline anisotropy constant K1 of generated Co2+ compensates the negative K1 of MnZn ferrites, which forms the K1 = 0 point in the K1(T) curve. The optimal V2O5 content range is 0.02–0.08 wt.%. The MnZn ferrite with 0.04 wt.% V2O5 exhibits that \(\mu_{i}\) is as high as 4180 and the cutoff frequency fr is above 1 MHz. Meanwhile, \(\mu_{i}\) maintains broad-temperature characteristics in the temperature range from 20°C to 140°C. The addition of V2O5 results in the formation of liquid phase during the sintering process, which promotes grain growth and density. This improves \(\mu_{i}\) of MnZn sample. The developed MHz MnZn ferrites with high permeability have great potential applications in the high-frequency inductors in broad temperature condition.
