Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure

J. Phys. IV France 7 (1997) C2-365-C2-367
DOI: 10.1051/jp4/1997019

Valence State Spin Polarization in 3d-3d and 3d-4d Magnetic Materials by Resonant and Non-Resonant X-Ray Emission

J.J. Gallet¹, J.M. Mariot¹, C.F. Hague², J.P. Kappler³, J. Goulon⁴, A. Rogalev⁴, G. Krill⁵, M. Sacchi⁶ and T. Hricovini<sup>7

1</sup>  Lab. de Chimie Physique - Matière et Rayonnement (URA 176), Université Pierre et Marie Curie, 75231 Paris cedex 05, France
²  Lab. de Chimie Physique. Matière et Rayonnement (URA 176), Université Pierre et Marie Curie, 75231 Paris cedex 05, France
³  IPCMS-GEMME, Université Louis Pasteur, 67070 Strasbourg cedex, France
⁴  ESRF, BP. 220, 38043 Grenoble cedex, France
⁵  LURE, Campus Universitaire, 91405 Orsay cedex, France
⁶  LURE, Campus Universitaire, 91405 Orsay cedex France
⁷  LPMS, Université de Cergy-Pontoise, 95011 Cergy, France

Abstract
Magnetic circular dichroism in X-ray fluorescence from ferromagnetic systems potentially provides unique information on valence state spin polarization. We discuss the use of direct polychromatic radiation from the Helios n helical undulator (97% circular polarization) to excite the Rh 4d valence states. We also show how polychromatic radiation may be used to obtain dichroic resonant fluorescence under standing-wave conditions in magnetic multilayers.

© EDP Sciences 1997