Induced anisotropies in ferromagnetic amorphous ribbons locally annealed by laser

Abstract

The origin of anisotropy induced by local laser annealing has been studied in amorphous ferromagnetic materials with different magnetostriction constants. The results have been explained using a theoretical model based on the assumption that the origin of the induced anisotropies are internal stresses produced by inhomogeneous heat flows during the local laser annealing. The induced anisotropies are not uniform, which produces a magnetostatic energy that can modify the induced magnetoelastic anisotropy. This effect can be used to induce different anisotropies by changing the shape of the local laser annealing.