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It is shown thatjthe high frequency extraordinary waves, propagating perpendicuiar to the dc magnetic Geld in ferromagnetic systems, are governed by the nonlinear Schrodinger equation and are modulationally unstable and may-evolve as solitons.

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In this paper, four-wave mixing in plasmas for the case of a transmission geometry is investigated. The exact solutions of appropriate nonlinear equations for a phase shift between the refractive index grating and interference pattern of the optical beams have been found. The existence of multistability and self-oscillations in the process has been shown. It should be pointed out that our solutions contain both intensities and phases of the beams.