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The dynamical motion of the magnetization plays a key role in the propertiesof magnetic materials. If the magnetization is initially away from theequilibrium direction in a magnetic nanoparticle, it will precess at a naturalfrequency and, with some damping present, will decay to the equilibriumposition in a short lifetime. Here we investigate a simple but importantsituation where a magnetic nanoparticle is driven non-resonantly by anoscillating magnetic field, not at the natural frequency. We find a surprisingresult that the lifetime of the transient motion is strongly tunable, byfactors of over 10,000, by varying the amplitude of the driving field.

Tunable Transient Decay Times in Nonlinear Systems: Application to Magnetic Precession