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MA: Magnetismus

MA 8: Elektronentheorie

MA 8.1: Vortrag

Montag, 8. März 2004, 15:45–16:00, H22

High-field magnetic susceptibility of ferromagnetic metals — •Sergiy Mankovskyy and Hubert Ebert — Dept. Chemie/Phys. Chemie, 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. Additional contributions to the magnetic susceptibility (e.g. spin-charge response function, contribution related to a Fermi level shift) become important in the ferromagnetic state if compared with the paramagnetic one. Illustrating examples are presented for various 3d transition metal systems. In particular, the magnetic susceptibilities have been calculated for weak magnetic systems such as ZrZn₂ and TiBe₂. As is known from experiment [1,2] they are ferromagnetic under substitution of some Zn and Be atoms by vacancies and Cu atoms, respectively. The calculations have been performed both for the ferromagnetic and paramagnetic states of ZrZn_x and TiBe_xCu_1−x alloys. The XMCD spectra of ferromagnetic solids in the presence of an external magnetic fields are calculated and compared to those obtained for the case without any fields. [1] B. T. Mattias and R. M. Bozorth, Phys. Rev., 109 (1958) 604. [2] G. S. Knapp, F. Y. Fradin and H. L. Culbert, J. Appl. Phys., 42 (1971) 1041.