Induced Copper Magnetism in Permalloy-Copper Bilayers

M. Belakhovsky; B. Gilles; P. Kamp; A. Marty; J.B. Goedkoop; N.B. Brookes

doi:doi:10.1051/jp4/1997043

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


Page(s)		C2-443 - C2-444
DOI		https://doi.org/10.1051/jp4/1997043

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

J. Phys. IV France 7 (1997) C2-443-C2-444
DOI: 10.1051/jp4/1997043

Induced Copper Magnetism in Permalloy-Copper Bilayers

M. 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

Abstract
We have performed dichroic measurements at the L_2,3 edges of the 3 elements Ni, Fe and Cu on the ESRF beam line BL26 (« Circular Polarisation »). The samples were Ni_0.8Fe_0.2 /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 : M_L /M_S = 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 [4], also exemplify the high potential of ESRF for XMCD experiments ( few atomic layers and tiny induced dichroism).