Ferrimagnetic Resonance in Gadolinium Iron Garnet

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. g_Gd 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.