Abstract
We investigated dynamical effects in a system of magnetic multilayers which arise at different rates of change of the external field. Our studies have been stimulated by recent experiments indicating nontrivial magnetic dynamics in these systems. To describe a system consisting of magnetic layers, we have used conventional Bloch equations. A time-dependent external magnetic field has been applied, but no dissipation effects have been taken into account. We have studied the time development and instabilities of the regular behaviour of this system numerically. We found local energy excitations (breathers) and chaotic transients. The behaviour and the final configurations can strongly depend on the initial conditions, and the strength of the external field at an earlier time. We observed some sudden switching between two remarkably different states. The series of bifurcations has been found.
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