Fig. 2
Phase diagram of NiCoCrx alloys. Illustration of the rapid non-linear decrease in Curie temperature, T c, with chromium concentration, x. The Curie temperatures for each composition are estimated from Arrott plots, the maximum in -dM/dT with H = 100 Oe, or extrapolation of M2 vs T with H = 100 Oe. The T c’s determined by each method are self-consistent within an error of about ± 2 K. (see ref 19 for additional details). The inset shows a magnetization curve for a NiCoCr0.6 crystal at 5 K. The small value of the spontaneous moment indicates highly itinerant ferromagnetism
