Volume 40, Number 5, December I 1997
|Page(s)||575 - 580|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Quasi-elastic neutron scattering on γ-Fe2O3 nanoparticles
Laboratoire des Milieux Désordonnés et
Hétérogènes (Associated to the CNRS.) ,
Université Pierre et Marie Curie, Tour 13, Case 78, 4 place Jussieu, 75252
Paris Cedex 05, France
2 Laboratoire de Physicochimie Inorganique, Université Pierre et Marie Curie, Bât. F, case 63, 4 place Jussieu, 75252 Paris Cedex 05, France
3 Laboratoire Léon Brillouin, CEN, Saclay Gif-sur-Yvette, France
4 Laboratory of Kinetics of Anisotropic Fluids, Urals Branch of the Russian, Academy of Sciences, Perm, 614061, Russia
Accepted: 14 October 1997
Magnetodynamics of ferrofluid γ- nanoparticles is studied by Quasi-Elastic Neutron Scattering between 10 K and 250 K in the frequency range 1010–. We probe independently the precession of the core magnetic moment and surface spins fluctuations observed in a dissipative regime. These fluctuations slow down at low temperature leading to a frozen disorder of the surface layer.
PACS: 75.50.Tt – Fine-particle systems / 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion / 75.30.Gw – Magnetic anisotropy
© EDP Sciences, 1997
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