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MA: Fachverband Magnetismus

MA 26: Magnetic Thin Films I of 2

MA 26.5: Talk

Wednesday, March 13, 2013, 10:30–10:45, H3

Magnetic properties of Fe_xMn_1−x/Ni bilayers: an ab initio study — •Svitlana Polesya¹, Sergiy Mankovsky¹, Hubert Ebert¹, Wolfgang Kuch², and Jan Minar¹ — ¹Universität München, Department Chemie, Butenandtstr. 5-13, D-81377 München, Germany — ²Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

The TB-KKR Green’s function method is used for an ab initio investigation of thin antiferromagnetic Fe_xMn_1−x films deposited on a ferromagnetic (FM) Ni substrate. The calculations were performed for the Fe concentration x from 40 to 60 %. It is shown that the ground state magnetic structure of Fe_xMn_1−x films on FM Ni depends weakly on the concentration x but is modified essentially upon the change of the film thickness. Using the exchange coupling parameters evaluated on the basis of the selfconsistent electronic structure, the Neél temperature (T_N) of the Fe_xMn_1−x films is calculated by means of Monte Carlo simulations. In good agreement with experiment¹ T_N increases with increasing film thickness but exibits a much weaker dependence on the concentration x. The influence of the in-plane and out-of-plane magnetization direction of FM Ni on the magnetic structure and T_N of Fe_xMn_1−x films is also discussed.
[1]. M. Stampe, P. Stoll, T. Homberg, K. Lenz, W. Kuch, PRB 81, 104420 (2010).