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- Title
Structures in a Magnetic Suspension Subjected to Unidirectional and Rotating Field.
- Authors
Carletto, P.; Bossis, G.; Cebers, A.
- Abstract
Field induced structures are studied inside suspensions of magnetic colloidal particles of micronic size. We have characterized the average distance between aggregates in a thin cell with the magnetic field perpendicular to the plane and also in the presence of a rotating field with the plane of rotation perpendicular to the plane of the cell. The characteristic size of the mesostructure is predicted on the basis of a thermodynamic model. The theory well predicts the experimental results in the uniaxial case but not in the case of ae rotating field; in this last case, the surface tension which is needed to have a good fit is far too low compared to its expected order of magnitude. When the field is uniaxial and sinusoidal we have found a collective instability where all the aggregates are rotating simultaneously in a chaotic way.
- Subjects
COLLOIDS; MAGNETIC materials
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2002, Vol 16, Issue 17/18, p2279
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979202012244