Phase modulation of the surface acoustic breather

A theory of non-resonance surface acoustic breathers in nonlinear, dispersive and dissipative media is developed. The acoustic wave equation which describes nonlinear surface acoustic waves in the system insulating solid semi-space/solid layer (substrate-film) can be solved by using the reductive perturbation method. Explicit analytic expressions for the parameters of these nonlinear waves are obtained. The effects of phase modulation of a breather which are connected with interactions of acoustic waves with resonance paramagnetic impurities and with an external alternating magnetic field are discussed in detail. (C) 1999 Published by Elsevier Science B.V. All rights reserved.