Ferromagnetic resonance investigation of maghemite-silica nanocomposites

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作者：
Pereira, A.R. [1 ]
Miranda, K.L.C. [2 ]
Sartoratto, P.P.C. [2 ]
Morais, P.C. [3 ]
Bakuzis, A.F. [4 ]
机构：
[1] Departamento de Matemática, Instituto de Cîncias e Letras Do &#7742dio Araguaia, Universidade Federal de Mato Grosso, 78698-000 Pontal do Araguaia-MT, Brazil
[2] Instituto de Química, Universidade Federal de Goiás, 74001-970 Goiânia-GO, Brazil
[3] Núcleo de Física Aplicada, Instituto de Física, Universidade de Brasília, 70919-970 Brasília-DF, Brazil
[4] Instituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia-GO, Brazil
来源：
Journal of Applied Physics | 2006年 / 100卷 / 08期
关键词：
Maghemite-silica nanocomposites were prepared from water-based magnetic fluids through the sol-gel method. X-ray diffraction revealed that the maghemite nanoparticles had a size of 5 nm. Electron magnetic resonance of the composites was studied as a function of temperature and nanoparticle concentration. The resonance field was found to decrease upon increasing the maghemite concentration; while the linewidth increased. The effect was interpreted in terms of interparticle as well as intraparticle magnetic interactions. The data analysis suggests the presence of small agglomerates in the maghemite-silica nanocomposite for higher particle concentrations. © 2006 American Institute of Physics;
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