Abstract
Magneto-optical effect, i.e. the dependence of the absorption coefficient on the magnetic field H and the angle ι (ι is the angle between the electric vector of incident light and the applied magnetic field) has been studied in a mineral oil based magnetic fluid in the infrared region from 3000 cm−1 to 5000 cm−1. It has been observed that the change of absorption coefficient in the infrared region is wavelength and magnetic field independent for the angle \(\Theta _c = arccos(1/\sqrt 3 ) = 54.73^ \circ \). The anomaly in absorbance of infrared light in studied magnetic fluids has been observed at λ=2.94 μm, approximately. This anomaly has been studied as a function of volume concentration of magnetic particles and applied external magnetic field. Obtained results showed that anomaly has a magnetic origin and it is probably connected with aggregation of magnetic particles.
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