Tape casting and characterization of yttrium iron garnet ferrite thick film for microwave substrate application

Abstract

In this study, the tape casting and characterization of a yttrium iron garnet (YIG) ferrite thick film was carried out for microwave substrate applications. A high-performance YIG ferrite thick film was developed using a well-dispersed non-aqueous YIG slurry. The resulting green YIG film exhibited a smooth surface and a uniform particle-packing structure with a green density of 3.12 g/cm3. The YIG substrate sintered at 1480 °C exhibited a dense microstructure and good properties with a bulk density of 5.06 g/cm3, dielectric constant (εr) of 14.2, dielectric loss (tanδe) of 1.8 × 10−4 (10 GHz), saturate magnetization (4πMs) of 168.2 mT, coercive force (Hc) of 0.47 Oe, and ferromagnetic resonance linewidth (ΔH) of 5.2 KA/m. Thus, the YIG casting film developed in this study was found to be suitable for microwave substrate applications.