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MA: Fachverband Magnetismus

MA 5: Electron Theory of Magnetism

MA 5.7: Talk

Monday, March 23, 2009, 12:30–12:45, HSZ 103

A new scheme to calculate the exchange coupling tensor — •Sergey Mankovsky and Hubert Ebert — Dept. Chemie und Biochemie/Phys. Chemie, Universität München, München, Deutschland

A new scheme to calculate the exchange coupling tensor J_ij describing in a phenomenological way the anisotropic exchange coupling of two moments in a magnetically ordered system is presented. The ab-initio approach is based on spin-polarised relativistic multiple-scattering theory within the framework of spin-density functional theory. The scheme is applied to ferromagnetic CrTe as well as the diluted magnetic semiconductor (DMS) system Ga_1−xMn_xAs. In the later case the results show that there is a noticeable anisotropy in the exchange coupling present, although not as pronounced as suggested in recent theoretical investigations.