Abstract
A simple model for calculating the change in the initial susceptibility of fine grain assemblages of ferromagnets under uniaxial compression is presented. The change in the initial susceptibility under compression is explained by combining two; homogeneous rotation of the spontaneous magnetization vector of individual magnetic domains and hardening of the domain wall movement due to deformation of materials under uniaxial compressional stress. Numerical calculation is shown to be in agreement with the experimental values of natural titanomagnetite and nickel.
