Magnetic properties of alloys with critical concentration and invar anomalies

To elucidate certain anomalous properties of Invar iron-nickel alloys, flow theory methods have been used, taking into account the alloy composition fluctuations. It is shown that the composition fluctuations are conductive to a universal concentration dependence of magnetic properties. The alloys under consideration are heterogeneous in the vicinity of the ferromagnetic-antiferromagnetic concentration transition, as far as their magnetizm is concerned. Their magnetic moment and Curie point depend to a large extent on their concentration. As far as the fixed composition alloys are concerned, the common nature of magnetic properties variation with the growth of the conceptration at OK and at higher temperatures has been pointed out