Abstract
Ferrimagnetic resonance in single crystals of gadolinium iron garnet has been observed at 9479 and 23 725 mc. Crystals from two different preparations have different compensation points (13° and 32°C). The resonance behavior is discussed in terms of a two sublattice theory. gGd is equal to 2.006 above −90°C and increases at lower temperatures. The gadolinium ions contribute to the anisotropy below −40°. An extra resonance observed near the compensation point is attributed to inclusions in the crystals. The gadolinium apparently contributes substantially to the total damping of the magnetization.
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