Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Magnetische Dünne Schichten I

MA 13.6: Vortrag

Mittwoch, 13. März 2002, 16:30–16:45, H10

Electronic and magnetic properties of Fe/GaAs heterogeneous systems and related compounds — •Michal Košuth and Hubert Ebert — Dept. Chemie (Physikalische Chemie), LMU, Butenandtstr. 5-13, 81377 München, Germany

The electronic and magnetic properties of ferromagnet-semiconductor heterostructure multilayer systems have been studied by means of scalar-relativistic KKR-CPA band structure calculations. Concerning the resulting magnetisation profiles of Fe₃/(GaAs)₅ and other related systems the most important features are that no magnetically dead layers occurred and an appreciable induced magnetisation was found in the semiconductor subsystem. By investigation of the hyperfine interaction more detailed information on the electronic structure could be obtained. Properties of related compounds (Fe_xAs_y, Fe_xGa_y), possibly occuring at the Fe/GaAs interface, were investigated in addition. Alloying at the interface could explain the loss of magnetisation in the Fe layers adjacent to the semiconductor reported by some experimentalists.