Bright Envelope Solitons in the Double Negative Media Based on Thin Films of Nonlinear Ferromagnetic Semiconductor

The paper presents the theoretical results that demonstrate the bright envelope soliton formation on a backward electromagnetic wave existing in a double negative medium based on a magnetized thin film of ferromagnetic semiconductor (FM SC). An analytical model of a magnetized ferromagnet containing magnetized cold and collisionless electron plasma is constructed based on the use of Maxwell's equations and material expressions including tensor functions of dielectric permittivity and magnetic permeability. The nonlinearity of the FM SC is due to the dependence of magnetization on the amplitude of the high-frequency magnetic field. It is shown that one of the solutions of the nonlinear Schrodinger equation with coefficients depending on the electromagnetic properties of the BEMW has a form of a bright envelope soliton. The duration of such nonlinear pulses is controlled by the change of thickness of a FM SC film, strength of a magnetic bias field and electron concentration in plasma.