Investigation on Ti⁴⁺ substitution LiZn ferrite with FMR linewidth at Ku band

LiZn ferrites with different sintering temperature and substitution of Ti⁴⁺ were prepared by a ceramic process. Pure spinel phase was observed by XRD analysis. Morphological features exhibited a growth in grain size and saturation magnetization dramatically decreased with increase of sintering temperature and Ti⁴⁺ substitution contents, respectively. Anisotropy constant (K ₁) was calculated by the law of approach to saturation and ferromagnetic resonance (FMR) linewidth (ΔH) at Ku band was investigated. The FMR linewidth had been separated to anisotropy-induced and porosity-induced linewidth by an approximate calculation based on spin-wave approach. It turns out that anisotropy contribution keeps almost a constant about 40 Oe with various Ti⁴⁺ substitution. However, porosity-induced linewidth (ΔH_p) reduce with various sintering temperature. The results also show that ΔH_p occupies the majority of ΔH at Ku band and optimizing densification is an effective way to decrease ΔH. (paper)