Effect of Mn3+ doping on the loss of Li0.37Zn0.26Ti0.12Fe2.37O4 ferrite

In this paper, a series of the gyromagnetic ferrite Li 0.43 Zn 0.26 Ti 0.12 Mn x Fe 2.19−x O 4 (x = 0–0.14) samples were prepared with the solid-phase reaction sintering method. The influences of Mn 3+ doping on the microscopic morphology, ferromagnetic resonance linewidth, and microwave dielectric loss of LiZnTi ferrite were investigated. Doping in an appropriate amount of Mn 3+ will reduce the saturation magnetization of the sample and the magnetocrystalline anisotropy of the ferrite. It also inhibited the generation of Fe 2+ and reduced the porosity, to the benefit of keeping the ferromagnetic resonance linewidth (Δ H ) of the material and microwave dielectric loss at a low level. The results suggested that when the doping amount of Mn 3+ is 0.08, the ferromagnetic resonance linewidth of the material is 27.8 × 10 3 A m −1 , the microwave dielectric loss tangent tan δ ε equals to 0.001, and the B-H hysteresis loop remanence ratio of the sample reaches 0.87, which is a beneficial application in lock-type microwave ferrite devices.