New dynamic method to study longitudinal magneto-optical effects in ferrofluids

F. Donatini; Jean Monin

doi:10.1117/12.250801

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18 September 1996 New dynamic method to study longitudinal magneto-optical effects in ferrofluids

F. Donatini; Jean Monin

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Proceedings Volume 2782, Optical Inspection and Micromeasurements; (1996) https://doi.org/10.1117/12.250801
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

To our best knowledge, longitudinal magneto-optic effects in ferrofluids are generally measured under a steady magnetic field. We present an original polarimetric method to measure the circular birefringence (CB) and the circular dichroism (CD) of magnetic liquid materials placed in low sinusoidal magnetic field H_M cos(Omega) t. A lot of results obtained with ferrofluids synthesized by the coprecipitation method. CoFe₂O₄, MnFe₂O₄ and (gamma) -Fe₂O₃, in dibutyl phthalate, diethylene glycol, glycerol or water are given. Measurements of CB and CD versus magnetic field, wavelength (500 nm to 1600 nm), frequency (1 Hz to 50 kHz) and temperature (253 K to 373 K) are reported. A clue for the interpretation of the magnetically induced circular anisotropy is given, which reinforced the hypothesis of the field induced aggregation of single particles into strings.

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F. Donatini and Jean Monin "New dynamic method to study longitudinal magneto-optical effects in ferrofluids", Proc. SPIE 2782, Optical Inspection and Micromeasurements, (18 September 1996); https://doi.org/10.1117/12.250801

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