Abstract
The orientational dynamics of a system of noninteracting hard-magnetic ferroparticles in a fluid matrix rotating in a transverse magnetic field small as compared with the effective anisotropy field of a particle was considered. The problem of the dynamics of an individual particle with a magnetic moment incompletely frozen in the crystalline matrix was solved. An orientational microkinetic equation was formulated with allowances made for the Brownian motion of particles for high rotation frequencies. It was established that the presence of a small orientational freedom of the moment in the particle body dramatically changes the behavior of the system. A particular result is a giant retardation of the mechanical and magnetic orientational relaxation in the colloid preliminary magnetized along the rotation axis.
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Kashevskii, B.E. On Nonlinear Orientational Effects in the Ferrocolloid Rotating in a Magnetic Field. Colloid Journal 63, 550–557 (2001). https://doi.org/10.1023/A:1012386616220
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DOI: https://doi.org/10.1023/A:1012386616220