STUDY OF MAGNETO-DIELECTRIC AND MAGNETOOPTICAL EFFECTS IN MINERAL-OILBASED MAGNETIC FLUIDS

The magneto-dielectric effect and magnetooptical effect (absorption co efficient in infrared range) were studied for mineral oil based magnet ic fluids with magnetite particles in the volume concentration range f rom phi = 0.0125 to phi = 0.2. The anisotropy parameter - g defined as a ratio of change of dielectric constant DELTAepsilon(parallel-to)(H) (absorption coefficient DELTAA(parallel-to)(H)) for E parallel-to H w ith respect to zero magnetic field dielectric constant and change of d ielectric constant DELTAepsilon(perpendicular-to)(H) for E perpendicul ar-to H (DELTAA(perpendicular-to)(H)) has been calculated from the exp erimental data for booth effects. The values of g nearly equal 2 has b een found in agreement with theoretical predictions.