9 research outputs found

    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/Cu_{100-x}M_x/Co(001) trilayers (M=Zn, Au, and Ni) with varying thicknesses of the spacer.Comment: 5 pages, LaTeX, 1 figure. Submitted to Phil. Mag.

    Magnetism without magnetic impurities in oxides ZrO2 and TiO2

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    International audienceWe apply the density functional technique to investigate the magnetism induced in transition metal dioxides ZrO2 and TiO2 by substitution of the cation by a vacancy or an impurity from the groups 1A or 2A of the periodic table, where the impurity is either K or Ca. It is demonstrated that the vacancy and the K-impurity leads to a robust induced magnetic moment on the surrounding O-atoms for both the cubic ZrO2 and rutile TiO2 host crystals. The native O-vacancy does not induce a magnetic moment in the host dioxide crystal
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