Microwave Properties of Polycrystalline Hybrid Garnets

Abstract

The microwave properties of a number of polycrystalline mixed garnets have been studied. The compositions investigated included solid solutions of yttrium iron garnet with gadolinium iron, samarium iron, yttrium aluminum, yttrium gallium, and yttrium chromium garnets. Ball‐mill mixing techniques were employed in specimen preparation. Line width, saturation magnetization, and effective g‐factor measurements were made as a function of composition and temperature for all specimens studied. Curie temperatures were also measured for each specimen. The merits of using these garnet compositions for microwave component applications are amplified by the fact that some of their properties may be independently controlled. Data on temperature compensation and high‐power effects are presented as well as a discussion of the applicability of these materials to microwave solid‐state devices.