Determination of the magnetic transition temperature of dilute ferromagnetic alloys - the Pd(Gd) case

The determination of T c in dilute alloys is examined. As an example, magnetization vs field data in a Pd 0.95Gd 0.05 alloy are presented. For this alloy, it was not possible to determine a value of T c using Arrott-Belov-Kouvel (ABK) plots; the conditions for the applicability of ABK plots were not satisfied. Results of very-low-field ac and dc magnetization vs T, which depend mainly on the demagnetization factor, yield a more precise measure of T c. We conclude that the latter procedures are more useful than ABK plots for determination of T c in dilute alloys.