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The structural, magneto-optical, optical, and magnetic properties of BaTi1−xFexO3 films grown by pulsed laser deposition onto MgO (100) have been investigated for Fe content, x=0.15, 0.2, 0.3, and 0.5. Saturation Faraday rotation varies from 0.033deg∕μm for x=0.2 to 0.109deg∕μm for x=0.5 at a 1.55-μm wavelength, with corresponding saturation magnetizations of 11.3emu∕cm3 and 18.3emu∕cm3. The optical absorption drops with a reduction in iron content and the BaTi0.85Fe0.15O3 sample has an optical absorption of 1.9dB∕mm. The magneto-optic figure of merit, which is the ratio of Faraday rotation to absorption, peaks at x=0.2 among the samples considered. The magnetic properties are interpreted in terms of the electronic structure of Fe4+ ions, and their exchange coupling with Fe3+ ions associated with oxygen vacancies.

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We find that when an electromagnetic wave propagates in an isotropic ferromagnetic medium, an effective field, equivalent to the anisotropic and constant external field, is created. The magnetic induction lies in a plane normal to the direction of propagation. Also, the excitation of magnetization of the ferromagnetic medium is restricted to the normal plane at the lowest order of perturbation, and goes out of plane at higher orders. The excitations of the magnetization and magnetic induction, and hence also the magnetic field, are governed by soliton modes. ͓S1063-651X͑97͒10103-9͔