SOME ASPECTS OF THE NONLINEAR DYNAMICS OF MAGNETIC DOMAIN-WALLS

In this paper elements of chaos theory art applied to the study of the dynamics of a previously proposed model for a 180 degrees Bloch wall under the action of an alternating magnetic field in materials without nonferromagnetic inclusions. The new element brought to these studies is the comparison between the powers of the chaotic and controlled os cillations. This comparison implied firstly the design of a method for finding periodic orbits and then the setting of a chaos control metho d. A parametric method was chosen. in which a control parameter propor tional to the field's amplitude was used, and which offers more possib ilities than that of a previously reported work. The existence of peri odic orbits with smaller dissipation than that of the chaotic trajecto ry is proved. (C) 1997 Elsevier Science S.A.