Abstract
Compositional dependence of the stress + longitudinal field induced magnetic anisotropy (SLFA) in (Co1−xFex)75Si15B10 (0 ⋚ x ⋚ 1), (Co1−xNix)75Si15B10 (x = 0.22) and [Co1−x(Fe0.5Ni0.5)x]75Si15B10 (x = 0.20, 0.50, and 0.80) amorphous alloy ribbons has been studied. The magnetic field was applied parallel to the ribbon axis. Two mechanisms have been invoked in order to explain the microscopic origin of this anisotropy: the directional ordering of atomic pairs, and the tetrahedral holes like 3Co–1Fe and 1Co–3Fe. The last contribution is found to be similar both in its direction and its value with respect to that obtained for stress + transverse field induced anisotropy (STFA) in the same compositions containing Fe, while in the Co–Ni samples only the first contribution is responsible for the SLFA, depending on its direction for the field annealing.
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