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The magnetic and hydrodynamic properties of magnetic fluid depend on the micro behavior of the particles in the media. In this paper, we discuss the relaxation mechanism of Mn-Zn and cobalt ferrite particles in kerosene based magnetic fluid by measuring the initial susceptibilities in the temperature range of 83-293 K. The Mn-Zn ferrite magnetic fluid was found to consist almost only of superparamagnetic (SP) particles, where as the cobalt ferrite magnetic fluid consists of non-SP particles that relax through Brownian rotation for fields less than 440 Oe and influence the magnetic and hydrodynamic properties of the fluid.>
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Nakatsuka et al. (1994) studied this question.
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