Nonlinear self-localized magnetoelastic surface waves in antiferromagnetic medium

Summary form only given. Nonlinear magnetoelastic waves (ME) in an antiferromagnet (AF) possess a variety of distinguished properties ensuring their use in magnetoacousto-electronic processing. Strong ME interaction is responsible for a giant effective anharmonicity of the elastic system. The ME energy density close to the crystal surface can be quite high due to the wave excitation close to the surface. So, it is easy to stimulate large amplitudes of the ME surface waves. In such a case, nonlinear effects are especially important for surface ME wave propagation. In the present study types of self-localized, ME surface waves in the AF are predicted, the existence of which is determined entirely by the nonlinear properties of the AF. Such waves have no analogs to the case of linear ME waves and become delocalized with zero amplitude. The frequency spectrum of these waves is shown to be located in the gap between the upper quasimagnon and the lower quasiphonon branches of the harmonic spectrum. A nonlinear Schrodinger equation for the envelope of the surface ME wave is derived and its solitonic solutions are obtained. The application of the nonlinear ME surface waves for optical information processing is discussed