The MBN signal is generated due to the irreversible movement
of magnetic domain walls.The amplitude depends on residual
and applied stresses.Thus, it is auseful NDT technique to detect
the presence of the residual and applied stresses in ferromagnetic
samples. In steels with a positive magnetostrictive constant,
experiments [74–81] confirmed that the MBN amplitude was
increased due to the elastic tensile stress in the direction of the
magnetization but decreased due to the compressive stress.It is
due to the different effects of tensile and compressive stresses on
the movement of domain walls [82–84]: tensile stress increases
the number of mobile 180 domain walls, reorients domains or
modifies the pinning barriers, but compressive stress makes the
flux closure domain formation by decreasing the number of 180
domain walls.