Temperature Variation of Susceptibility of Some Amorphous Antiferromagnetic Oxides

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Abstract
The temperature dependence of the susceptibilities of amorphous magnetic oxides with various iron/yttrium and iron/gadolinium stoichiometries have been studied between 4.2° and 320°K. The reciprocal susceptibilities of the iron/yttrium oxides exhibited an unusual downward curvature at low temperatures. These measurements are interpreted by means of a simple effective field model for amorphous antiferromagnetic materials recently proposed by one of the authors. Good agreement between the experimental results and the theory is obtained. The analysis enables certain broad conclusions to be drawn about the number and distribution of interacting pairs of magnetic atoms.

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