Improvement of Dielectric and Magnetic Properties of Ybiig Ferrite by Ca-Zr Co-Substitution

Abstract

Yttrium iron garnet (Y3Fe5O12, YIG) ferrite had excellent magnetic properties suitable for microwave communication devices. In present research, Ca-Zr co-substituted Y1.83-xBi1.17CaxFe5-xZrxO12 (YBiIG, x=0.00-0.15 with a step of 0.05) ferrites were prepared by a solid-state reaction method to obtain dielectric and magnetic properties. The phase formation, microstructure, dielectric and magnetic properties of the materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), impedance analyzer, vibrating sample magnetometer (VSM), and ferromagnetic resonance (FMR) linewidth. The results showed that Ca2+-Zr4+ ions improved the uniformity of the microstructure and increased the magnetic permeability μ' (μ' = 24.10 @10 MHz, x = 0.15) and dielectric constant (ε' = 24.55 @10 MHz, x = 0.15). Meanwhile, the specific saturation magnetization (σs) increased from 20.26 emu/g to 22.79 emu/g with the Ca-Zr substitution increase, and the FMR linewidth (ΔH) decreased from 406.34 Oe to 339.60 Oe. The work showed Ca-Zr substituted YBiIG ferrite materials had potential for use in microwave high frequency device application, such as circulators, isolators, phase shifters and other microwave components.

Keywords: YIG ferrite, Ca-Zr co-substitution, magnetic properties, dielectric constant, Ferromagnetic resonance linewidth