Issue |
EPL
Volume 86, Number 1, April 2009
|
|
---|---|---|
Article Number | 10005 | |
Number of page(s) | 5 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/86/10005 | |
Published online | 21 April 2009 |
Relaxation of the field-induced structural anisotropy in a rotating magnetic fluid
1
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: regine.perzynski@upmc.fr
Received:
27
January
2009
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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