Tunable magnetostatic waves bandpass filters with scandium doped yttrium iron garnet films

Abstract

This paper reports results of theoretical and experimental studies of microwave bandpass tuned filters based on magnetostatic surface wave (MSSW) propagation in yttrium iron garnet (YIG) films. Filter transmission and input impedance characteristics for saturation magnetization 139 kAm−1 of YIG films and 32 kAm−1 of scandium-doped YIG films have been calculated and measured experimentally. Structures of a planar, multilayer metal-dielectric-YIG geometry are used to model the filters. Parameters of the structures have been optimized with the help of a computer. Scandium-doped YIG films of thickness near 100 Μm and saturation magnetization 32 kAm−1 have been found potentially useful in the manufacture of tunable bandpass filters.