Influence of exchange bond disorder on the magnetic properties of (Pd1−xFex)95Mn5 near T c

Abstract

A summary of a detailed study of the field and temperature dependent ac susceptibility of a series of ternary (Pd1−xFex)95Mn5 alloys near the ferromagnetic ordering temperature Tc is presented. By following the behavior of the crossover line (a line of maxima in the field dependent susceptibility above Tc, the maxima moving upwards in temperature but decreasing in amplitude with increasing field) it is possible to catalog the influence of exchange bond disorder on aspects of the critical behavior. These ternary systems are not soft ferromagnets and thus asymptotic critical exponents are difficult to estimate using this technique. Nevertheless, effective exponents (i.e., obtained away from the critical point) clearly reflect the presence of significant variance in the distribution of exchange bonds.