Tunable Transient Decay Times in Nonlinear Systems: Application to   Magnetic Precession
  The dynamical motion of the magnetization plays a key role in the properties of magnetic materials. If the magnetization is initially away from the equilibrium direction in a magnetic nanoparticle, it will precess at a natural frequency and, with some damping present, will decay to the equilibrium position in a short lifetime. Here we investigate a simple but important situation where a magnetic nanoparticle is driven non-resonantly by an oscillating magnetic field, not at the natural frequency. We find a surprising result that the lifetime of the transient motion is strongly tunable, by factors of over 10,000, by varying the amplitude of the driving field. 
M. G. Phelps, K. L. Livesey, A. M. Ferona, R. E. Camley
cond-mat.mes-hall cond-mat.mtrl-sci nlin.CD