Magnetic properties of Ni:SiO2 nanocomposites synthesized by a modified sol-gel method
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Applied Physics A
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Ni nanoparticles embedded in an amorphous SiO2 matrix were produced by a modified sol-gel method. This method resulted in nanocomposites with a controlled size distribution and good dispersion of the metallic particles. The particle-size distributions were found to have an average radius of ∼3 nm, as inferred from transmission electron microscopy, X-ray-diffraction analysis, and magnetic measurements. Magnetic characterizations revealed that samples exhibit superparamagnetic behavior above the blocking temperature TB, 20 K ≤ TB ≤ 40 K, and absence of a shift along the field axis on hysteresis loops measured at T ≤ TB, indicating that the metallic nanoparticles are also free from an oxide layer.
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FONSECA, F.C.; GOYA, G.F.; JARDIM, R.F.; CARRENO, N.L.V.; LONGO, E.; LEITE, E.R.; MUCCILLO, R. Magnetic properties of Ni:SiO2 nanocomposites synthesized by a modified sol-gel method. Applied Physics A, v. 76, n. 4, p. 621-623, 2003. DOI: 10.1007/s00339-002-2029-9. Disponível em: http://repositorio.ipen.br/handle/123456789/7485. Acesso em: 30 Dec 2025.
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