Faraday rotation measurements in maghemite-silica aerogels

E. Taboada, R. P. Del Real, M. Gich, A. Roig, E. Molins

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    13 Citations (Scopus)


    Faraday rotation measurements have been performed on γ-Fe 2O3/SiO2 nanocomposite aerogels which are light, porous and transparent magnetic materials. The materials have been prepared by sol-gel polymerization of a silicon alkoxide, impregnation of the intermediate silica gel with a ferrous salt and supercritical drying of the gels. During supercritical evacuation of the solvent, spherical nanoparticles of iron oxide, with a mean particle diameter of 8.1±2.0 nm, are formed and are found to be homogenously distributed within the silica matrix. The specific Faraday rotation of the composite was measured at 0.6 T using polarized light of 810 nm, being 29.6°/cm. The changes in the plane of polarization of the transmitted light and the magnetization of the material present similar magnetic field dependencies and are characteristic of a superparamagnetic system. © 2005 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)175-180
    JournalJournal of Magnetism and Magnetic Materials
    Issue number1
    Publication statusPublished - 1 Jun 2006


    • Faraday rotation
    • Magnetic nanoparticles
    • Magneto-optical properties
    • Nanocomposite


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