BRILLOUIN-SCATTERING IN CO CU/CO AND CO/AU/CO TRILAYERS - ANISOTROPY FIELDS AND INTERLAYER MAGNETIC EXCHANGE/

Magnetic anisotropy and interlayer exchange have been studied by Brill ouin scattering on textured sandwiched Co/Cu/Co or Co/Au/Co structures normal to a [111] (pseudo-fee) axis or to a [0001] (pseudo-hcp) axis, obtained by ultrahigh-vacuum evaporation on oxidized silicon or on fl oat glass substrates. The surface contribution to the uniaxial anisotr opy is approximately constant in all magnetic layers (K-s approximate to 0.8 erg cm(-2)). The volume contribution is strongly sample depende nt. In Co/Au/Co, an oscillatory variation of the interlayer exchange i s observed with a pseudo-period of 4.1 monolayers and a damping length of 5.1 monolayers, in good agreement with previously published determ inations.