Abstract
The magnetic susceptibilities of Mo-y at.% Co and W-x at.% Co alloys, where y = 1.65, 1.085 and 0.535, and x = 1.05, 0.87 and 0.54, have been measured in the range 27-300 °K. The results can be fitted to a modified Curie-Weiss law of the form χ - χ0 = C/(T - Θ), where the background susceptibility χ0 is determined from the data. This represents an assumption that the alloying process modifies the background susceptibility to a small degree. A moment of about 1.8 μB then appears associated with Co in W, and about 1.5 μB in Mo. The Curie-Weiss behaviour is believed to represent increasing spin compensation of the moment as the temperature is lowered. The results are discussed in the light of 59Co nuclear magnetic resonance results in four of the six alloys and in terms of current theories of s-d exchange in magnetically dilute alloys.