A simplified procedure is given for determining the 5 magnetostriction constants of a single crystal of a ferromagnetic cubic crystal. The crystal is cut as a disk parallel to a (110) plane, and strain gauges are cemented to the surfaces to measure strains in [001] and [11̄1] directions. A magnetic field sufficient for saturation is oriented in 10^∘{} steps at various angles to the [001] direction, and magnetostriction is measured over a 90^∘{} range for each gauge. Each of the 18 data is then multiplied by suitable numbers, obtained by inversion of the strain matrix, to give the constants h₁⋯h₅. The method is applied to a crystal of a 78 percent nickel-iron alloy to determine the magnetostriction associated with spontaneous magnetization in the [111] direction: λ₁₁₁=2h₂3+2h₅9, a quantity important in the "Permalloy problem." The constants are also determined for a single crystal of nickel.
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Bozorth et al. (1953) studied this question.