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

TL;DR

This paper demonstrates that the transient decay time of magnetization in a magnetic nanoparticle can be dramatically tuned over four orders of magnitude by adjusting the amplitude of a non-resonant oscillating magnetic field.

Contribution

It reveals a novel method to control the decay times of magnetic precession through non-resonant driving field amplitude variations.

Findings

Transient decay time varies over 10,000-fold with field amplitude.

Non-resonant driving significantly influences magnetization dynamics.

Potential applications in magnetic data storage and spintronics.

Abstract

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.