SOFT-X-RAY RESONANT MAGNETIC SCATTERING FROM A MAGNETICALLY COUPLED AG NI MULTILAYER/

X-ray resonant magnetic scattering experiments using linear and circul ar polarized light were performed at the Ni L(2,3) absorption edges on a Ag/Ni multilayer. A superlattice magnetic peak, due to the antiferr omagnetic coupling between Ni layers, is evidenced. In the case of a f erromagnetic coupling, large changes in the charge peak (up to 15%) ar e observed upon reversal of the direction of the magnetic field. The m agnetic scattering amplitude is evaluated to sro per nickel atom. Sum rules have been applied for the first time to the energy-dependent mag netic amplitude.