The combined effect of temperature and disorder on interlayer exchange coupling in magnetic multilayers

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We study the combined effect of temperature and disorder in the spacer on the interlayer exchange coupling. The temperature dependence is treated on ab initio level. We employ the spin-polarized surface Green function technique within the tight-binding linear muffin-tin orbital method and the Lloyd formulation of the IEC. The integrals involving the Fermi-Dirac distribution are calculated using an efficient method based on representation of integrands by a sum of complex exponentials. Application is made to Co/Cu₁₀₀₋ₓMₓ/Co(001) trilayers (M=Zn, Au, and Ni) with varying thicknesses of the spacer.