Structure and Pt magnetism of FePt nanoparticles investigated with X-ray diffraction

Films consisting of 3D ordered arrays of FePt nanoparticles of similar to5 nm in size have been investigated with X-ray diffraction. At low angles, the diffracted intensities provide some evidence that the nanoparticles have an outer shell less dense than their interior. At high angles, the superstructure reflections have been used to evaluate the order parameter. Resonant magnetic diffraction at the Pt L-III absorption edge indicates that the magnetic moment of the Pt atoms in an Fe38Pt62 nanoparticle film is significantly smaller than that from a bulk alloy with similar composition. (C) 2003 Elsevier Science B.V. All rights reserved.