Abstract
We calculate the magnetic susceptibility in ferromagnetic metals above the Curie temperature TC using the dynamic spin fluctuation theory and make a detailed comparison with experiment. Calculation results for Fe, Co and Ni are found in good agreement with experiment over a wide temperature range. The paramagnetic Curie temperature is found 7–8% larger than the ferromagnetic one in agreement with experiment and various approximations of the Heisenberg model. We calculate the spin-density correlator to show that magnetic short-range order leads to deviation of the susceptibility from the Curie-Weiss law in the temperature interval up to1.1–1.2TC.
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