The initial Matteucci effect

Abstract
The magnetoelastic anisotropy introduced by torsional twist in ferromagnetic wires allows the measurements of the circular magnetization Mphi as a function of the longitudinal magnetic field Hz and the longitudinal magnetization Mz as a function of the circular magnetic field Hphi . For two types of samples, twisted to saturation the Mphi -Hz and Mz-Hphi curves were obtained. These curves show two different types of behaviour.