Magneto-optical effect in magnetic emulsions with deformable submicron droplets

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Abstract

The effect of changes in the transparency of magnetic emulsions with deformable droplets of submicron size under the influence of a magnetic field has been studied. The influence of microdroplet concentration, orientation, and magnetic field strength on the amplitude of transparency changes was discovered. A comparison has been made of experimental data on the field dependence of the magneto-optical effect and the dependence on the angle of magnetic field orientation with calculations in the anomalous diffraction approximation. The possibility of estimating interfacial tension in magnetic emulsions based on studying the processes of relaxation of optical effects is discussed.

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About the authors

S. S. Belykh

North Caucasus Federal University

Author for correspondence.
Email: sergeyb.stav@mail.ru
Russian Federation, Stavropol

C. V. Yerin

North Caucasus Federal University

Email: sergeyb.stav@mail.ru
Russian Federation, Stavropol

I. V. Alferiev

North Caucasus Federal University

Email: sergeyb.stav@mail.ru
Russian Federation, Stavropol

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2. Fig. 1. Change in the optical density of the magnetic emulsion when exposed to a magnetic field of different duration: 2 (1), 6 (2), and 12 s (3). The inset shows the pulse shape of the acting magnetic field. H = 1.5 kA/m, directed parallel to the laser beam. The volume concentration of MF droplets is 3%.

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3. Fig. 2. Dependence of the amplitude of the change in optical density on the magnetic field strength at different sample concentrations. The field is directed parallel to the laser beam.

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4. Fig. 3. Dependence of the amplitude of the change in optical density on the orientation of the magnetic field. H = 1.5 kA/m, vol. concentration of MF droplets 1%.

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5. Fig. 4. The influence of magnetic field on the transmission spectra of magnetic emulsion.

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6. Fig. 5. Calculated dependence of the relaxation time of the shape of a deformed drop on the value of interfacial tension for drops of different sizes.

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