Issue |
J. Phys. IV France
Volume 7, Number C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
|
|
---|---|---|
Page(s) | C2-59 - C2-65 | |
DOI | https://doi.org/10.1051/jp4/1997008 |
J. Phys. IV France 7 (1997) C2-59-C2-65
DOI: 10.1051/jp4/1997008
Magnetic EXAFS
G. Schûtz and D. AhlersUniversität Augsburg, Experimental Physics II, Memmingerstr. 6, 86135 Augsburg, Germany
Abstract
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