ΔE effect for an iron–cobalt alloy: longitudinal and transverse magnetostriction strain as a function of the applied stress σ (uniaxial), modelling (lines) and experimental (points) results from reference [35]. The dotted line reproduces the modelling results obtained in reference [35]. The plain line shows the results from equation (26) (modelling parameters: λ_s = 4010⁻⁶, α = 1.2510⁻⁷ Pa⁻¹).