Microstructure and electromagnetic properties of Ca–V co-doped YIG ferrite with narrow ferromagnetic resonance linewidth

Yttrium iron garnet (YIG) ferrites play a crucial role in microwave devices due to their tunable saturation magnetization and narrow ferromagnetic resonance (FMR) linewidth. In this study, we successfully synthesized Ca–V co-doped Y_2.7−2xCa_0.3+2xFe_4.7−xZr_0.3V_xO₁₂ (0.00 ≤ x ≤ 0.35, ∆x = 0.07) ferrite and conducted an in-depth investigation into its microstructure and electromagnetic properties. The findings indicate that moderate ionic substitution can effectively reduce the porosity and FMR linewidth while enhancing the saturation magnetization and resistivity. In particular, the occupation rate of cation sites was comprehensively analyzed, and the separation of the FMR linewidth was calculated. At a substitution level of x = 0.07, the YIG ferrite exhibits excellent comprehensive performance, where the sample has a bulk density of 4.968 ± 0.011 g/cm³, a saturation magnetization of 1932 Gs, an FMR linewidth of 28.80 ± 1.25 Oe, a coercivity of 2.24 Oe, and a DC resistivity of (3.50 ± 0.37) × 10⁶ Ω•m. The Ca–V co-doped CaZr-YIG ferrite exhibits not only superior overall performance but also considerable potential for integration into microwave component design.