The influence of SiO2 layer thickness of (Fe52Pt48)(88)Cu-12:SiO2 multilayer nanocomposite films on their structural and magnetic properties were investigated. The films were deposited on (001) textured FePt films, and then annealed at 873 K. The crystalline texture of (Fe52Pt48)(88)Cu-12:SiO2 films changes drastically with respect to the thickness of the SiO2 layers. In the film with 50-angstrom thick SiO2 layers, the (111) peak was strong although the (001) orientation is dominant, and self-organized spherical FePtCu particles were formed in the SiO2 matrix. However, in the film with 19-angstrom thick SiO2 layers, flat FePt grains with perfect (001) orientation were obtained. In addition, twins with different crystalline orientations were seen in the above films with different thicknesses of the SiO2 layers. Accordingly, different perpendicular hysteresis loops were obtained. (C) 2009 Elsevier B.V. All rights reserved.