Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 12: Elektronentheorie

MA 12.5: Vortrag

Samstag, 5. März 2005, 10:00–10:15, TU EMH225

High-field magnetic susceptibility of ferromagnetic metals and alloys — •Sergey Mankovsky and Hubert Ebert — Dept. Chemie und Biochemie, Universität München, Butenandtstr. 5-13, D-81377 München, Germany

The results of a theoretical study of the high-field magnetic susceptibility of ferromagnetic metals and alloys are presented. The theoretical description of the magnetic susceptibility is based on a combination of a linear response approach and the fully relativistic Green’s function formalism. In contrast to the paramagnetic state, additional contributions to the magnetic susceptibility (e.g. spin-charge response function, contributions related to a Fermi level shift) become important in the ferromagnetic state. These contributions have been taken into account in our calculations as well as the contribution of the Landau susceptibility. The results of calculations of the high-field susceptibility of the 3d transition metals Fe, Ni and Co are found in good agreement with experiment. Also the high-field susceptibilities calculated for binary Fe_xCo_1−x, Fe_xNi_1−x, Ni_xCu_1−x alloys are presented and compared with experimental data.