The anisotropy energy of the Y(Co1 - xFex)3 compounds has been determined between 4.2 and
250 K. The concentration dependence of the anisotropy energy behaves anomalously in this pseudo-binary
series. Upon increasing the iron content, the anisotropy energy increases up to x = 0.25, then decreases,
changes sign around x = 0.45 and reaches a flat minimum at the iron-rich side. This anomaly can
satisfactorily be explained in terms of the individual site anisotropy model by considering the different
occupancy factors of iron and cobalt for the 3d sites. ?? 1989.
