Ultrasmall iron nanoparticles: Effect of size reduction on anisotropy and magnetization

Journal Article · Tue Apr 01 00:00:00 EDT 2008 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2837625· OSTI ID:21137314

Lacroix, L -M; Lachaize, S; Falqui, A; Blon, T; Carrey, J; Respaud, M; Dumestre, F; Amiens, C; Margeat, O; Chaudret, B; Lecante, P; Snoeck, E ^[1]

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1. Laboratoire de Physique et Chimie des Nano-Objets, 31077 Toulouse Cedex 4 (France)

Stable iron nanoparticles have been synthesised by the decomposition of (Fe(N[Si(CH{sub 3}){sub 3}]{sub 2}){sub 2}){sub 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(CH{sub 3}){sub 3}]{sub 2}. The magnetization is found to be M{sub S}=1.92{mu}{sub B}/at., i.e., 10% lower than the bulk value. The Moessbauer spectrum is fitted by two contributions of metallic iron. The magnetic anisotropy energy constant increases up to 5.2x10{sup 5} J/m{sup 3}, i.e., ten times the bulk one.

• OSTI ID: 21137314
• Journal Information: Journal of Applied Physics, Vol. 103, Issue 7; Conference: 52. annual conference on magnetism and magnetic materials, Tampa, FL (United States), 5-9 Nov 2007; Other Information: DOI: 10.1063/1.2837625; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
COMMINUTION
DECOMPOSITION
DISPERSIONS
FERROMAGNETIC MATERIALS
IRON
MAGNETIZATION
MOESSBAUER EFFECT
NANOSTRUCTURES
PARTICLES