J. Phys. IV France 7 (1997) C2-443-C2-444
Induced Copper Magnetism in Permalloy-Copper BilayersM. Belakhovsky1, B. Gilles1, P. Kamp1, A. Marty1, J.B. Goedkoop2 and N.B. Brookes2
1 Département de Recherche Fondamentale sur la Matière Condensée, Service de Physique des Matériaux et Microstructures, CEA/Grenoble, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
2 European Synchrotron Radiation Facility (ESRF), avenue des Martyrs, BP. 220, 38043 Grenoble cedex, France
We have performed dichroic measurements at the L2,3 edges of the 3 elements Ni, Fe and Cu on the ESRF beam line BL26 (« Circular Polarisation »). The samples were Ni0.8Fe0.2 /Cu bilayers elaborated by molecular beam epitaxy. The Cu spectra show a dichroic effect, which decreases regularly as a function of Cu spacer thickness. A significant orbital contribution is present, and the application of the sum rules leads to a ratio of orbital to spin magnetic moments for the Cu d electrons : ML /MS = 0 . 14±0.01, 0.21±0.02, 0.38±0.03 (respectively for .2, .4 and .6 nm of Cu). These measurements, which contrast with the CoCu case , also exemplify the high potential of ESRF for XMCD experiments ( few atomic layers and tiny induced dichroism).
© EDP Sciences 1997