Magnetization measurements and the magnetic inhomogeneity of random metal alloys

It is argued that the straightness or otherwise of plots of M_b² vs (B₀/M_b) (where M_b is the magnetization in a magnetic induction B_o and at approximately zero temperature) for different concentrations in the critical or percolation concentration region for long-range ferromagnetic order in atomically disordered metal alloys is neither a satisfactory measure of the magnetic (and/or metallurgical) homogeneity of the alloys nor is it an acceptable test of the applicability of Landau's theory of phase transitions to such alloy systems.