Stable iron nanoparticles have been synthesised by the decomposition of {Fe (N [Si (C H3)3] 2)2 }2 under dihydrogen pressure. Those conditions lead to a system of monodisperse and metallic nanoparticles which diameter is less than 2 nm and stabilized by HN [Si (C H3)3] 2. The magnetization is found to be MS =1.92 μB at., i.e., 10% lower than the bulk value. The Mössbauer spectrum is fitted by two contributions of metallic iron. The magnetic anisotropy energy constant increases up to 5.2× 105 J m3, i.e., ten times the bulk one.
Ultrasmall iron nanoparticles : effect of size reduction on anisotropy and magnetization / L.M. Lacroix, S. Lachaize, A. Falqui, T. Blon, J. Carrey, M. Respaud, F. Dumestre, C. Amiens, O. Margeat, B. Chaudret, P. Lecante, E. Snoeck. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - 103:7(2008 Feb), pp. 07D521.1-07D521.3. [10.1063/1.2837625]
Ultrasmall iron nanoparticles : effect of size reduction on anisotropy and magnetization
A. Falqui;
2008
Abstract
Stable iron nanoparticles have been synthesised by the decomposition of {Fe (N [Si (C H3)3] 2)2 }2 under dihydrogen pressure. Those conditions lead to a system of monodisperse and metallic nanoparticles which diameter is less than 2 nm and stabilized by HN [Si (C H3)3] 2. The magnetization is found to be MS =1.92 μB at., i.e., 10% lower than the bulk value. The Mössbauer spectrum is fitted by two contributions of metallic iron. The magnetic anisotropy energy constant increases up to 5.2× 105 J m3, i.e., ten times the bulk one.
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