Magneto-optical spectra of ultrathin Au/M/Co/Au films (M = Au, Cu, Ag)

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Visnovsky, S. | Nyvlt, M. | Prosser, V. | Ferré, J. | Grolier, V. | Beauvillain, P. | Ould-Mahfoud, S.

Edité par CCSD ; Elsevier -

International audience. Complex polar Kerr and Faraday effects between 1.5 and 5.2 eV in ultrathin Au/M/Co/Au films, with M = Au, Ag or Cu, prepared by thermal evaporation under ultra high vacuum condition are reported. The structure in the dispersion spectra is dominated by the effect of the Au layer underneath the ultrathin Co film. Thanks to the high layer perfection and step-like interface profiles strong sharp peaks in Kerr rotation, centered at the Au plasma edge near 2.5 eV, are observed. The introduction of Ag or Cu overlayers, which also display plasma edge effects in the considered energy range, modifies the spectra. This behaviour is satisfactorily explained by the electromagnetic wave model in magnetic multilayers.

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