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  • 1
    Electronic Resource
    Electronic Resource
    Scattering anisotropy and giant magnetoresistance in magnetic multilayers (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7107-7109 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present full ab initio calculations of giant magnetoresistance (GMR) in Co/Cu (001) multilayers including self-consistent impurity scattering potentials. Starting from density functional theory the electronic structure of the multilayer and the scattering at impurities are described by means of a new Green function method. It will be demonstrated that impurity scattering in magnetic multilayers is strongly anisotropic in comparison to impurity scattering in bulk systems. Concerning transport the anisotropy of scattering leads to a formation of highly conducting channels which give rise to short circuits and cause strong variation of GMR as a function of the impurity position in the multilayer. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1361047
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ab initio calculations of spin-dependent transport properties (invited) (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5276-5276 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ab initio calculations of transport properties for ferromagnetic dilute alloys and magnetic multilayers are reported. The electronic structure of the considered system is calculated within the frame of density functional theory using local spin density approximation. The scattering of the electrons by impurities is described self-consistently by means of the Green function of the perturbed system. As a result the spin anisotropy of the scattering can be discussed without any free parameter. The transport is described quasiclassically, that is, the linearized Boltzmann equation is solved taking into account the anisotropy of the Fermi surface and the anisotropy of electron-impurity scattering. The method is applied to calculate the residual resistivity of dilute ferromagnetic Fe and Co alloys which are in very good agreement with experiment. Giant magnetoresistance (GMR) was computed for Fe/Cr multilayers for CIP (current in plane) and CPP (current perpendicular to plane) geometry. It can be shown that GMR exists for spin-independent scattering (Fe impurities in Cr layers) determined by the electronic structure of multilayers in ferro- and antiferromagnetic configuration. The consideration of spin-dependent scattering (say Cr impurities in Fe layers) enhances or reduces the GMR effect in dependence of the spin-anisotropy. It can be shown especially that combination of defects with different spin-anisotropy can produce inverse GMR. Finally, calculations are presented for GMR in granular Cu(Co) systems. From the investigation becomes obvious, that the effect is strongly influenced by the spin anisotropy of scattering. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361351
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ab initio calculations of giant magnetoresistance (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5182-5184 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present ab initio calculations of the giant magnetoresistance in magnetic multilayers. The electronic structure of the multilayers is calculated by spin density functional theory using a screened Korringa–Kohn–Rostoker method. The scattering of nanostructural defects in the multilayers is described by means of a Green's function method. The scattering potentials are calculated self-consistently. The transport properties are treated quasiclassically solving the Boltzmann equation including the electronic structure of the layered system and the anisotropic scattering. The solution of the Boltzmann equation is performed iteratively taking into account both scattering out and scattering in terms (vertex corrections). Since we consider ferromagnetic systems a two current model is applied. Trends of residual resistivities and giant magnetoresistance ratios are discussed for Co/Cu multilayers with 3d transition metal defects. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373288
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  • 4
    Electronic Resource
    Electronic Resource
    Interlayer exchange coupling in Fe/Au multilayers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6588-6590 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The aim of this article is to present ab initio calculations of interlayer exchange coupling for Fe/Au (001) multilayers with the same spacer thickness as in recently performed experiments. The structure is characterized by a bcc–fcc transition. The calculations are based on density functional theory using a scalar relativistic screened Korringa–Kohn–Rostoker method. The results show that in case of ideally smooth interfaces the differences of the theoretically and experimentally obtained coupling strengths by one order of magnitude remain. It will be demonstrated that the usual explanation by means of a mesoscopic roughness fails. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372779
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    Paper (German National Licenses)
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