NONLINEAR SURFACE MAGNETIC POLARITONS IN A NONUNIFORM MAGNETIC-FIELD

High-frequency surface magnetic polaritons of finite amplitude propaga ting along the interface between a ferrite and a nonlinear insulator i n a weakly nonuniform, shaft-shaped external magnetic field are invest igated theoretically. The analysis is based on employment of the varia tional method together with bilinear relations having the form of Lore ntz's lemma. It is shown that the wave dispersion and the transverse p rofile of a wave along the field nonuniformity depend significantly on the amplitude of the wave. (C) 1998 American Institute of Physics. [S 1063-7842(98)01809-1].