Multi-substitution-induced changes in microstructure and electromagnetic properties of YIG ferrites

Abstract

In this paper, Ce-In co-substituted YIG ferrite materials composed of Ca_0.4Y_2.6-xCe_xSn_0.4Fe_4.6-xIn_xO₁₂ (x = 0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5) were synthesized by a conventional solid-state route. The crystal structure, microstructural, dielectric, and magnetic properties of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), impedance analyzer, vibrating sample magnetometer (VSM), and ferromagnetic resonance (FMR). The results demonstrated that Ce-In co-substitution would not affect the synthesis of intact phase of YIG. In addition, an appropriate amount Ce-In substitution could increase the bulk density from 4.793 g/cm³ (x = 0) to 5.133 g/cm³ (x = 0.5), improve the dielectric constant (ε′ = 18.9 @100 MHz at x = 0.5), and reduce the ferromagnetic resonance linewidth (ΔH = 337.88 Oe at x = 0.4), but result in the decrease of saturation magnetization (M_S = 23.6 emu/g at x =0.4).