Faraday rotation in ultrafine magnetic structures

Abstract

The Faraday rotation is considered in magnetic fluids based on particles of magnetic oxides, for the optical constants of the material of which, n and k, the relation k^2 << n^2 holds. The Faraday rotation is represented within the theoretical Maxwell–Garnett model. A theoretical analysis has shown that Faraday rotation for magnetic fluids is related to the Faraday rotation on the material of particles by the simple relation. According to this result, in specific experimental conditions the values of the Faraday rotation prorate to q, which is the occupancy of the volume of the magnetic fluid with magnetic particles, and spectral dependences of the Faraday rotation in magnetic fluid and in the proper bulk magnetic are similar. We would like to underline that this result are expected to be suitable to all magnetic ultrafine medium with the same relation between optical constants n and k.