Nonlinear dynamics of a damped magnetic oscillator
Sang-Yoon Kim; Sang-Yoon Kim; Department of Physics, Kangwon National University, Chunchon, Kangwon-Do 200-701, Korea
Журнал:
Journal of Physics A: Mathematical and General
Дата:
1999-10-01
Аннотация:
We consider a damped magnetic oscillator (MO), consisting of a permanent magnet in a periodically oscillating magnetic field. A detailed investigation of the dynamics of this dissipative magnetic system is made by varying the field amplitude A. As A is increased, the damped MO, albeit simple looking, exhibits rich dynamical behaviours such as symmetry-breaking pitchfork bifurcations, period-doubling transitions to chaos, symmetry-restoring attractor-merging crises, and saddle-node bifurcations giving rise to new periodic attractors. Besides these familiar behaviours, a cascade of `resurrections' (i.e., an infinite sequence of alternating restabilizations and destabilizations) of the stationary points also occurs. It is found that the stationary points restabilize (destabilize) through alternating subcritical (supercritical) period-doubling and pitchfork bifurcations. We also discuss the critical behaviours in the period-doubling cascades.
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