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Comparison between a magneto-optical method and Fannin's technique for the measurement of Brown's relaxation frequency of ferrofluids

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4 Author(s)
Payet, B. ; L.R.C.C.I., St.-Etienne Univ., France ; Siblini, A. ; Blanc-Mignon, M.F. ; Noyel, G.

A magneto-optical method, conceived in our laboratory to measure Brown's relaxation frequency of ferrofluids, is compared with Fannin's technique based on impedance measurements (slit toroid). We have developed a complete theory and an experimental setup of the first method and have briefly described the second one. We present a study of Brown's relaxation of cobalt ferrite Fe2CoO4 in different carrier liquids (glycerol, diethylene glycol, dibutyl phthalate, and water). The two methods show very close results, proving the high sensitivity of both. The relation between the viscosity η and Brown's relaxation frequency fB has been verified. Moreover the analysis of relaxation and viscosity versus temperature has enabled us to estimate the hydrodynamic diameter of particles

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 3 )