Dresden 2003 – wissenschaftliches Programm
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O: Oberflächenphysik
O 19: Symposium Magnetismus an Oberfl
ächen und Grenzfl
ächen
O 19.4: Fachvortrag
Dienstag, 25. März 2003, 16:45–17:15, HSZ/02
Magnetic circular dichroism in X-ray absorption – Theoretical description and applications — •Ján Minár and Hubert Ebert — Phys. Chem. Universität München, Butenandtstr. 5-13, München
The magnetic circular dichroism in X-ray absorption (MCXD) is now a standard tool to probe the spin and orbital moments in magnetic materials. Motivated by the MCXD-measurements a corresponding fully relativistic description has been developed that is based on the fully relativistic multiple scattering Green’s function method (SPR-KKR), and that has been applied since then to a great variety of different systems. A recent example for this are investigations on the L2,3-edge spectra of V and Ti in V/Fe and Ti/Fe-multilayers and alloys, that were studied experimentally by Scherz et al. Many magnetic compounds possess a non-collinear spin-structure, i.e. the atomic magnetic moments may be oriented with respect to each other in an arbitrary way. When dealing with the electronic structure of such systems this situation can be accounted for in a straightforward way by using SPR-KKR. The corresponding formalism to deal with non-collinear magnetic systems is briefly outlined and its application to the study of the X-ray magnetic linear dichroism of gamma-FeMn alloys is described. Finally, to stimulate corresponding experimental work results for the MCXD-spectra of the various constituents in Fe/GaAs/Fe-heterostructures are presented and discussed.