Abstract
It is shown that the ferromagnetic uniaxial anisotropy induced by magnetic annealing in solid solutions can be explained by the anisotropic coupling between atom pairs caused by the interplay between spin-orbit coupling and orbital valence. When the ferromagnetic solid solutions are annealed in the absence of magnetic field, every domain wall is stabilized by this induced uniaxial anisotropy, which leads to the perminvar character. The change of magnetization curves due to heat-treatments in various alloys can be interpreted in terms of these ideas.
