The magnetization of a single crystal of the 35.4 at% Ni–Fe Invar alloy has been investigated between 4.2 K and 280 K in external fields up to 16.9 kOe to an accuracy of about 5 parts in 10 5 . The spin-wave stiffness constant including its temperature variation and the higher-order term than the T 3/2 term due to the spin-wave excitations are determined from only the data of magnetization measurements. The observed decrease in magnetization excluding the spin-wave term depends on T 2 and seems to be associated with the Stoner-type excitations. The contribution of T 2 term is found to be as large as the spin-wave contribution.
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Nakai et al. (1980) studied this question.
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