HIGH ENERGY X-RAY MAGNETIC SCATTERING: A NEW TECHNIQUE. Th. Brückel, Hamburger Synchrotron-Strahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany

Magnetic x-ray scattering owes some of it's success to the resonance enhancements observed at the L_{[[Iota]][[Iota]]},L_III,-edges of Lanthanides and the M_IV,M_V-edges of Actinides. For transition metal compounds at most very weak resonance phenomena are observed in the hard x-ray range and one is left with the small non-resonant magnetic scattering cross section. In this situation, the use of high energy x-rays with energies above 100 keV might provide a possible remedy. At these energies transition metal compounds become virtually transparent to x-rays. Penetrations depths amount to several millimetres. This leads to a volume enhancement of the signal, independent of the material under consideration. True bulk properties become accessible, which can be of importance in the study of magnetic disorder phenomena. In the limit of very high energies, x-rays become sensitive to the spin momentum only, which should allow a separation of spin and orbital angular momentum without polarisation analysis.

In the present contribution, the principles of the new technique are discussed and results of first experiments on simple magnetic model systems are presented.