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Surface effects in magnetic nanoparticles measured by means of a magneto-optical method

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5 Author(s)
Rosa, G. ; Laboratorio de Optoelectrónica, Instituto Nacional de Técnica Aeroespacial (INTA), Torrejón de Ardoz 28850, Spain ; Guerrero, H. ; Levy, D. ; Alvarez-Herrero, A.
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Faraday rotation measurements have been made in samples composed of γ-Fe2O3 nanoparticles dispersed in a SiO2 matrix. All the samples show the same Fe/Si molar ratio but different diameters of the magnetic nanoparticles. A magneto-optical method to measure the particle size using the Faraday effect is presented. The increase of Faraday rotation with the mean diameter of the γ-Fe2O3 particles can be associated with surface effects. The thickness value of their external layer with disordered spins has been obtained using a simple model and its high value suggests the large influence of the matrix on the magnetic properties of the composite.

Published in:

Journal of Applied Physics  (Volume:97 ,  Issue: 6 )

Date of Publication:

Mar 2005

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