We provide a systematic analysis of finite-temperature magnetic properties of random alloys FexNi1−x with the face-centered-cubic structure over a broad concentration range x. By means of the spin-polarized relativistic Korringa-Kohn-Rostoker method we calculate the electronic structure of disordered iron-nickel alloys and discuss how a composition change affects magnetic moments of Fe and Ni and the density of states. We investigate how the Curie temperature depends on Fe concentration using conventional approaches, such as mean-field approximation or Monte Carlo simulations, and dynamic spin-fluctuation theory. Being devised to account for spin fluctuations explicitly, the latter method shows the best fit to experimental results.
@article{arxiv.2106.08765,
title = {Random iron-nickel alloys: From first principles to dynamic spin fluctuation theory},
author = {G. V. Paradezhenko and D. Yudin and A. A. Pervishko},
journal= {arXiv preprint arXiv:2106.08765},
year = {2021}
}