The uniaxial in-plane and out-of-plane anisotropies of [Co/SiO2] x 10 multilayers have been studied by ferromagnetic resonance, magnetometry and transmission electron microscopy. The surface and volume anisotropy constants are in the range of values typical for multilayers with Co and transition metals of the iron group. The influence of the intermixed Co-SiO2 region is discussed. (C) 2007 Elsevier B.V. All rights reserved.