M(H, T)‐curves of ordered and quenched polycristalline specimens of the equiatomic FePt alloy were taken from room temperature up to 620°C. The Curie temperature (446°C) of ordered FePt was found to be nearly 30°C lower than the hitherto reported value. The temperature dependency of (M2)H = 0 and (H/M)M → 0 agrees qualitatively with the predictions of the simple molecular field theory. For the saturation magnetization of FePt at room temperature an approximate value of 4πMs = 13500 G was determined, which confirms the results of a recent investigation but is much greater than that reported in the remaining literature. Ordered and quenched specimens showed no difference concerning Ms. From the paramagnetic susceptibility which was measured for the first time on this alloy, an effective moment of 3.4 Bohr magnetons per alloy atom was determined.
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