Berlin 2005 – scientific programme

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MA: Magnetismus

MA 17: Spinabh
ängiger Transport II

MA 17.8: Talk

Monday, March 7, 2005, 12:15–12:30, TU H1012

Effect of interface interdiffusion on the electronic, magnetic and transport properties of Fe/GaAs/Fe Trilayer Systems — •Voicu Popescu and Hubert Ebert — Department Chemie/Physikalische Chemie, University of Munich, Butenandtstr. 5-13, 81377 Munich, Germany

We report results of calculations on the electronic, magnetic and transport properties of As-terminated Fe/GaAs/Fe trilayer systems that have been obtained using the tight-binding Korringa-Kohn-Rostoker Green function method in a spin-polarised relativistic formulation (TB-SPR-KKR).

By means of the Coherent Potential Approximation alloy theory (CPA), interdiffusion at the Fe/GaAs interface has been accounted for. The changes induced by this in the properties of the whole Fe/GaAs/Fe junction (magnetisation profile, conductance) have been thoroughly investigated for different degrees of intermixing.

For the electronic transport it could be shown, in particular, that the main effect produced is a reduction of the spin selectivity at the ferromagnet-semiconductor interface, in line with previous model or ab initio calculations.