Optimization of Hot-Press Sintering for Cu2+-Sn4+ Co-Doped YIG Ferrites: Microstructure, Dielectric Properties, and Magnetic Properties

Yttrium iron garnet (YIG), as a core material in microwave devices, remains a key focus in materials science for performance optimization. In this study, Y3Fe4.8Cu0.1Sn0.1O12 samples were prepared via the solid-phase method with the co-doping of low-magnetic-anisotropy Cu2+ and Sn4+, combined with hot-press sintering under different conditions. Systematic analyses revealed that hot-press sintering optimized the microstructure, reduced porosity, and improved the compactness to 5.60 g/cm3. The sample hot-pressed sintered at 1200 °C achieved a maximum ε′ of 34, the lowest dielectric loss and a minimal FMR linewidth of 21 Oe, thus holding great potential for applications in high-frequency microwave devices requiring low loss and high integration. This work provides a viable approach to regulating the microstructure, dielectric properties, and magnetic properties of YIG ferrites.