Susceptibility of Gadolinium Iron Garnet below the Néel Point

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Abstract
Measurements of the spontaneous magnetization and the superposed paramagnetic susceptibility of gadolinium iron garnet have been repeated with a specimen of good stoichiometry, in the range of 2 to 300°K. It is concluded that the effective field which the Fe sublattices exert on the Gd ions causes paramagnetic saturation and consequently a reduction in susceptibility of the Gd sublattice. Good quantitative agreement is obtained by using molecular field theory without any adjustable constants, and in contrast to earlier interpretations, it is not found necessary to postulate appreciable antiferromagnetic interactions between the Gd ions.