The magnetization of cobalt-aluminium, cobalt-silicon, iron-aluminium and iron-silicon alloys

Abstract

The rate of change of magnetic moment with composition in several ferromagnetic cobalt-rich and iron-rich alloys of these systems has been derived from measurements of the variation of spontaneous magnetization with temperature. The measurements were made on the high-temperature face-centred cubic phase of the cobalt alloys, the magnetic moments at absolute zero being obtained by a suitable extrapolation procedure. In the Fe-Al and Fe-Si alloys, the initial rate of change of moment with composition corresponds to a simple dilution of the iron by the solute element, and increases in the range of compositions where ordering is known to exist. In the Co-Al and Co-Si alloys, the rate of change of moment with composition does not correspond to the number of valence electrons normally associated with the solute elements.