A scheme to calculate the electronic structure of systems having a spiral magnetic structure is presented. The approach is based on the KKR (Korringa-Kohn-Rostoker) Green's function formalism which allows in combination with CPA (Coherent Potential Approximation) alloy theory to deal with chemically disordered materials. It is applied to the magnetic random alloys FexNi1−x, FexCo1−x and FexMn1−x. For these systems the stability of their magnetic structure was analyzed. For FexNi1−x the spin stiffness for was determined as a function of concentration that was found in satisfying agreement with experiment. Performing spin spiral calculations the longitudinal momentum-dependent magnetic susceptibility was calculated for pure elemental systems (Cr, Ni) being in non-magnetic state as well as for random alloys (AgxPt1−x). The obtained susceptibility was used to analyze the stability of the paramagnetic state of these systems.
@article{arxiv.1012.3054,
title = {Spin spirals in ordered and disordered solids},
author = {S. Mankovsky and G. H. Fecher and H. Ebert},
journal= {arXiv preprint arXiv:1012.3054},
year = {2013}
}