This investigation was designed to obtain a more complete descrip¬tion of the resonance parameters of the yttrium iron garnet system at both small signal and high power levels. To do this, a number of sets of polycrystalline samples were made whose composition varied in a systematic way. The composition was varied by choosing the desired ratio of Y2O3, to Fe2O3 used in the manufacture of the samples. The finished samples ranged from 25 per cent iron excess through stoichiometric pro-portions to 15 per cent yttrium excess. In preparing the samples, four different firing atmospheres were used (air, oxygen, nitrogen, and argon) to obtain different states of sample oxidation. A number of sets were fired in each atmosphere to evaluate reproducibility.nFerrimagnetic resonance experiments were performed at 9317 Mc, and the linewidth, g-value and saturation curves of microwave susceptibility as a function of rf magnetic field strength were obtained. In addition, saturation magnetization and x-ray diffraction measurements were made and photomicrographs of the samples were taken.
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