Magnetostriction and Order-Disorder

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Abstract
An experimental and theoretical study of the relationship between saturation magnetostriction and the order-disorder transformation in an iron-cobalt alloy has been carried out. For the experimental work Fe-Co alloys in the neighborhood of the 50 atomic percent composition containing 0.75 percent Cr were employed. Measurements of both electrical resistivity and neutron diffraction have been used to confirm the presence of the superlattice. Measurements of the magnetostriction were made with a resistance strain gauge technique. An increase in the saturation magnetostriction is observed on ordering. Theoretical analysis based on the influence of order on the fluctuation of local electron density predicts a variation in agreement with experiment and also accounts for the influence of composition.

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