Faraday rotation in magnetic γ-Fe2O3/SiO2 nanocomposites
1997; American Institute of Physics; Volume: 71; Issue: 18 Linguagem: Inglês
10.1063/1.120181
ISSN1520-8842
AutoresH. Guerrero, G. La Rosa, M. P. Morales, Francisco del Monte, E. M. Moreno, David Lévy, R. P. del Real, T. Belenguer, Carlos J. Serna,
Tópico(s)Liquid Crystal Research Advancements
ResumoFaraday rotation spectrum has been measured at room temperature in a magnetic nanocomposite of γ-Fe2O3/SiO2. The material consists of isolated γ-Fe2O3 nanoparticles dispersed in a silica matrix, and it was prepared through a sol-gel method. The composite contains 18% of γ-Fe2O3 in weight with an average particle size of 20 nm. It has a coercitivity of 30 Oe and an MS of 6 emu/g. The specific Faraday rotation spectrum exhibits a narrow peak centered around 765 nm, reaching a value of 110°/cm and an absorption coefficient of 64 cm−1. Faraday rotation versus applied field has also been measured, and a cycle similar to the one described by the magnetization has been found.
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