J. Phys. IV France
Volume 7, Numéro C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
Page(s) C2-59 - C2-65
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure

J. Phys. IV France 7 (1997) C2-59-C2-65

DOI: 10.1051/jp4/1997008

Magnetic EXAFS

G. Schûtz and D. Ahlers

Universität Augsburg, Experimental Physics II, Memmingerstr. 6, 86135 Augsburg, Germany

The occurrence of a magnetic contribution in the EXAFS regime is a complex problem but interesting phenomenon since it is expected to contain unique information on the magnetic short-range order. Experimental studies of the small effects with sufficient high accuracy are required to provide the possibility of a reliable data analysis and interpretation. This is often hampered by the occurence of strong magnetic multi-electron effects and low-frequent atomic contributions as well as the strongly enhanced magnetic multiple scattering. Concerning the theoretical treatment problems arise, because the spin-dependency has to be included correctly and spin-orbit and exchange interaction have to be treated on the same level especially for higher photo-electron energies. Here we try to show, that by introduction of an additive spin-dependent part of the complex scattering amplitude for a spin-polarized outgoing photo-electron wave a reasonable interpretation of the experimental data is possible in a first approximation. The results of systematic measurements demonstrate the potential of this method to study magnetic and crystallographic structures and the low-energy exchange scattering process even in a quantitative manner.

© EDP Sciences 1997