Enhanced microwave gyromagnet and dielectric properties of In-doped LiZnTi spinel ferrite for high frequency device application

In this work, In-doped LiZnTi spinel ferrites were successfully synthesized at a low temperature (920 °C) using 2 wt% Bi 2 O 3 as a sintering aid. The effects of In 3+ doping concentration on phase formation, microstructure, gyromagnetic properties, and dielectric properties were investigated. Results showed that all samples exhibited a single spinel phase, and grain growth behavior was strongly influenced by In 3+ doping. Although saturation magnetization decreased with increasing In 3+ content, the real part of the magnetic permeability (μ') increased from 117 (x = 0.00) to 170 (x = 0.09), while maintaining low magnetic loss. Meanwhile, the dielectric constant showed an upward trend (ε' increased from 15.88 to 18.50) with minimal dielectric loss. Regarding gyromagnetic properties, the sample with x = 0.06 exhibited a narrow ferromagnetic resonance linewidth (ΔH) of 240.09 Oe. The combination of high dielectric constant and low linewidth suggests promising potential for low-loss microwave ferrite devices.