Optical Faraday effect in ferromagnetic and ferrite films

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Abstract
We have studied the Faraday rotation of the plane of polarization of linearly polarized light by thin films of the ferromagnetic metals, Ni, Fe, NiFe 2, CoFe2, and of the ferrimagnetic oxides, NiFe2O4 and CoFe2O 4. Hysteresis loops of the ferrite films are displayed using a Faraday effect hysteresigraph. Curves are given for the dispersion of Faraday effect in the metal and oxide films, from 1.4 × 104 to 3.7 x 10 4 wave numbers. In the metal films the rotation is positive and decreases as wave number increases. Superimposed on this general trend are several dispersive anomalies. Faraday rotation in the ferrite films is positive at large wave numbers and negative at lower wave numbers, displaying positive and negative peaks. Optical absorption in the ferrites is discussed