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We provide a systematic analysis of finite-temperature magnetic properties ofrandom alloys Fe$_x$Ni$_{1-x}$ with the face-centered-cubic structure over abroad concentration range $x$. By means of the spin-polarized relativisticKorringa-Kohn-Rostoker method we calculate the electronic structure ofdisordered iron-nickel alloys and discuss how a composition change affectsmagnetic moments of Fe and Ni and the density of states. We investigate how theCurie temperature depends on Fe concentration using conventional approaches,such as mean-field approximation or Monte Carlo simulations, and dynamicspin-fluctuation theory. Being devised to account for spin fluctuationsexplicitly, the latter method shows the best fit to experimental results.

Random iron-nickel alloys: From first principles to dynamic spin fluctuation theory