Recent experiments of Shimada have shown that under a constant magnetic field, a colloidal suspension of magnetic particles exhibits a magnetic relaxation which depends on the viscosity of the solvent even if the reorientation of the magnetic moment in each particle is considered to take place very fast. This phenomena is explained using the assumption that the particles form a chain-like cluster. It is shown that even if the reorientation process of the magnetic moment is very fast, the dipole-dipole interaction between the particles causes a relaxation process which depends on the solvent viscosity.
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Doi et al. (1992) studied this question.
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