  We report on spin-vortex pair dynamics measured at temperatures low enough to
suppress stochastic core motion, thereby uncovering the highly non-linear
intrinsic dynamics of the system. Our analysis shows that the decoupling of the
two vortex cores is resonant and can be enhanced by dynamic chaos. We detail
the regions of the relevant parameter space, in which the various mechanisms of
the resonant core-core dynamics are activated. We show that the presence of
chaos can reduce the thermally-induced spread in the switching time by up to
two orders of magnitude.
