Tunable transient decay times in nonlinear systems: Application to magnetic precession
Department of Physics and Energy Science, University of Colorado at Colorado Springs Colorado Springs, CO 80918, USA
Received: 22 December 2014
Accepted: 30 January 2015
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 10000, by varying the amplitude of the driving field.
PACS: 76.50.+g – Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance / 05.45.-a – Nonlinear dynamics and chaos / 75.75.Jn – Dynamics of magnetic nanoparticles
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