Recovery of magnetostriction values from torsional rigidity variations

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Abstract
The effects of longitudinal fields on torsional rigidity are examined. A simple model is found to predict salient features not heretofore recognized. Torsional rigidity is found to be diminished in the region where the magnetoelastic and magnetostatic energy densities are comparable to the anisotropy. In higher fields there is a consistent stiffening due to the reduction of the magnetoelastic component of the total shear strain. This stiffening is diminished with increasing torsion. The experimental visibility of each of these features in any real material depends on its elastic strength, Ms, and effective values of its anisotropy and magnetostriction. Recovery of an average absolute value of the magnetostriction requires an assessment of the manner in which the torsional rigidity varies with applied fields and torsion.

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