The influence of composition and porosity on the magnetic properties of FeCo–SiO2 nanocomposite aerogels

Alberto Casu; Maria Francesca Casula; Anna Corrias; Andrea Falqui; Danilo Loche; Sergio Marras; Claudio Sangregorio

doi:10.1039/B712719G

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The influence of composition and porosity on the magnetic properties of FeCo–SiO₂ nanocomposite aerogels†

Alberto Casu,^a Maria Francesca Casula,^a Anna Corrias,^a Andrea Falqui,*^a Danilo Loche,^a Sergio Marras^a and Claudio Sangregorio^b

Author affiliations

* Corresponding authors

^a Dipartimento di Scienze Chimiche and INSTM, Università di Cagliari, Cittadella Universitaria, Monserrato, Italy
E-mail: falqui@unica.it

^b Dipartimento di Chimica and INSTM, Università di Firenze, Via della Lastruccia, 3, Sesto Fiorentino, Italy

Abstract

FeCo–SiO₂ aerogel nanocomposites with different porosity were obtained using two different sol-gel procedures: the first involves a single acidic step and gives rise to relatively dense aerogels while the second procedure allows one to obtain highly porous aerogels using urea in the second step to promote fast gelation. Samples with different loading of FeCo equimolar alloy and with different Fe : Co ratios were prepared. The magnetic properties of all the nanocomposite aerogels were extensively studied as a function of porosity and composition. Particular attention was paid to the role played by the interparticle interactions, which are mediated by the silica matrix, in determining the collective magnetic behaviour. The kind and strength of magnetic interactions are affected by both the composition and the porosity of the matrix.

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Article information

DOI: https://doi.org/10.1039/B712719G
Article type: Paper
Submitted: 17 Aug 2007
Accepted: 19 Nov 2007
First published: 10 Dec 2007

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Phys. Chem. Chem. Phys., 2008,10, 1043-1052

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The influence of composition and porosity on the magnetic properties of FeCo–SiO₂ nanocomposite aerogels

A. Casu, M. F. Casula, A. Corrias, A. Falqui, D. Loche, S. Marras and C. Sangregorio, Phys. Chem. Chem. Phys., 2008, 10, 1043 DOI: 10.1039/B712719G

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