Abstract
We have studied amorphous Co 80-x Gd x B 20 alloys prepared by melt spinning technique. These alloys are magnetically soft attaining saturation in fields on the order of 1 tesla. The Gd moment is found to be 7μ B indicating a collinear spin structure. The Co moment decreases with increasing Gd content. Even under external fields up to 15 tesla the antiferromagnetic coupling GdCo is stable. The temperature dependence of the magnetization is described satisfactorily by the mean field theory model.
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