The parallel-pumped spin-elastic wave instability and ferromagnetic resonance were used to measure the dispersion and losses of π/2 spin waves in high-purity, single-crystal GdIG at low temperatures. The spin wave dispersion constant varies more rapidly with temperature than predicted by molecular field theory and the resonance losses are only a factor of three greater than those for YIG.
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Comstock et al. (1966) studied this question.
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