Magnetic hysteresis loss crossover in Ni0.4Zn0.6Fe1.95Ti0.05O4 ferrite

• Appropriate doped Ti in NiZn ferrites can largely cut down magnetic loss.
• A hysteresis loss crossover was found around Bm = 4 mT.
• The crossover was probably due to domain wall pinning by Ti4+ cation.

Ni0.4Zn0.6Fe2O4 and Ni0.4Zn0.6Fe1.95Ti0.05O4 ferrites were prepared by solid state reaction method and their magnetic properties were investigated. It was found that there is a magnetic hysteresis loss crossover around Bm = 4 mT, the hysteresis loss coefficient from 5.5 × 10−2 T−1 in Bm < 4 mT jump down to 4.0 × 10−2 T−1 in Bm > 4 mT in Ni0.4Zn0.6Fe1.95Ti0.05O4 sample by measuring field dependence of relative loss factor. This crossover was verified by measuring field dependence of real part permeability and magnetic loops. The possible mechanism of this crossover was discussed, and it was regarded that the crossover was due to magnetic domain wall pinning by Ti cation doped in ferrite.

The kinks in tanδ/μ vs. Bm and μ′ vs H indicated that hysteresis loss has a crossover around the kinks.Figure optionsDownload as PowerPoint slide