Abstract
The design of the magnetostatic waves (MSW) devices depends mainly upon the magnetization 4 π M s which can be changed either by a temperature shift or by substitution of Fe3+ions by non magnetic ions in the ferrimagnetic garnet. The influence of the Ga substitution on the characteristics of the MSW in YIG films is analyzed. The theoretical values of the temperature coefficient C= Δ f/f. Δ T of the MSW is determined in Y 3 Fe 5-y Ga y O 12 with a gallium content up to y=1. The coefficient C can be strongly decreased by a factor higher than 20 for y \simeq 1 . The Ga substitution induces a second effect with a reduction of the MSW bandwidth as predicted by calculation and observed from experiment. Both temperature and gallium substitution influences on the MSW frequency and bandwidth are determined from theoretical model and compared to experimental data.
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