On the Faraday effect in magnetic colloids

The propagation of plane-polarized microwave radiation in magnetic colloids with magnetite particles and magnetosensitive emulsions based on such particles is experimentally studied. A magnetic field exerted along the propagation direction leads to the rotation of the polarization plane (Faraday effect) provided that the magnetite concentration is higher than a certain critical level. Specific features of the effect in structured magnetic colloids and magnetic emulsions related to structural changes in the presence of magnetic field are revealed.