Volume 86, Number 1, April 2009
|Number of page(s)||5|
|Published online||21 April 2009|
Relaxation of the field-induced structural anisotropy in a rotating magnetic fluid
Laboratoire PECSA, UPMC - CNRS - ESPCI, UMR 7195 - case 51, 4 place Jussieu, 75005 Paris, France, EU
2 Laboratoire Léon Brillouin - CEA-CNRS UMR 12, CEA-Saclay - 91191 Gif-sur-Yvette, France, EU
3 Institute of Physics, University of Latvia - Salaspils-1, LV-2169, Latvia, EU
Corresponding author: email@example.com
Accepted: 12 March 2009
The relaxation of field-induced anisotropy in a magnetic fluid with dominant repulsion is theoretically modeled and experimentally measured by small angle neutron scattering on a sample rotating at angular velocity ω. The scattered pattern distortion scales as the Mason number , being the q-dependent diffusion time of nanoparticles. The model accounts for the magnetophoretical drift in the non-homogeneous self-magnetic field of the assembly, continuously created by the thermal noise. The Mn-dependence of the pattern distortion is well described without any adjustable parameter.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 83.85.Hf – X-ray and neutron scattering / 82.56.Na – Relaxation
© EPLA, 2009
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