Temperature dependent magnetization dynamics of magnetic nanoparticles

Details Temperature dependent magnetization dynamics of magnetic nanoparticles Temperature dependent magnetization dynamics of magnetic nanoparticles

2008-02-12

arxiv.org/abs/0802.1740v1

Physics

Condensed Matter

Other Condensed Matter

accepted by Journal of Physics: Condensed Matter

Scientific paper

10.1088/0953-8984/20/12/125226

Recent experimental and theoretical studies show that the switching behavior of magnetic nanoparticles can be well controlled by external time-dependent magnetic fields. In this work, we inspect theoretically the influence of the temperature and the magnetic anisotropy on the spin-dynamics and the switching properties of single domain magnetic nanoparticles (Stoner-particles). Our theoretical tools are the Landau-Lifshitz-Gilbert equation extended as to deal with finite temperatures within a Langevine framework. Physical quantities of interest are the minimum field amplitudes required for switching and the corresponding reversal times of the nanoparticle's magnetic moment. In particular, we contrast the cases of static and time-dependent external fields and analyze the influence of damping for a uniaxial and a cubic anisotropy.

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