This work is devoted to studying the structure and magnetic properties of FeRhl-xIrx (x = 0.5, 0.625, 0.75, 0.875, 1) alloys using first-principle methods using the VASP software package. Two types of structure (CuAu and CsCl) were considered in the work. The equilibrium lattice parameters, total energies and magnetic moments, and also total and partial densities of states for Fe-Rh-Ir were obtained. It was shown that an antiferromagnetic structure with a spin configuration of the AFM-III type is energetically favorable for all the studied alloys.
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