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AM: Magnetismus

AM 6: Elektronentheorie und Modelle geordneter Spinstrukturen

AM 6.7: Vortrag

Montag, 27. März 2000, 15:30–15:45, H22

Ab initio theory of perpendicular transport in layered magnetic systems — •Josef Kudrnovský — Institute of Physics, Academy of Sciences of the Czech Republic,
Na Slovance 2, CZ-182 21 Praha, Czech Republic

The current-perpendicular-to-plane magnetoconductance of a sample sandwiched by two ideal leads is described at an ab initio level. The so-called ‘active’ part of the system is either a trilayer consisting of two magnetic slabs of finite thickness separated by a non-magnetic spacer, or a multilayer formed by alternating magnetic and non-magnetic layers. We use a transmission matrix formulation of the conductance based on surface Green functions as formulated by means of the tight-binding linear muffin-tin orbital method. The formalism is extended to the case of lateral supercells with random arrangements of atoms of two types which in turn allows to deal with ballistic and diffusive transport on equal footing. Applications refer to fcc-based Co/Cu/Co(001) trilayers and multilayers in both the ballistic and diffusive regimes, including the transport through domain-walls. We will consider in detail the effect of substitutional alloying in in spacer and magnetic layers, as well as at interfaces between them.