Influence of the inverse faraday effect on switching and oscillations of magnetization in single-domain nanoparticles

Abstract

We have performed a numerical simulation of magnetization switching and oscillations in a ferromagnetic single-domain particle in the disk form under the influence of nanosecond laser pulses with linearly and circularly polarization. During the simulation of magnetization we have used the macrospin approximation with the generalized Landau-Lifshitz-Gilbert equation. In this model the interaction of laser with ferromagnetic metal leads to following processes: a change in energy magnetic crystallographicanisotropy and in a value of saturation magnetization, a generation of the spin-polarized current by photon pressure, an occurrence of the magnetic field induced by the magnetoopticalinverse Faraday effect in the case of circularly polarized laser. The analysis has shown that the interaction of laser pulses with a ferromagnetic nanodisk leads to change in the direction of its magnetization. This process is accompanied by magnetization oscillations with duration from units to tens of nanoseconds. As it follows from the obtained results, the main cause of magnetization switching is the reduction of magnetic anisotropy energy at heating of the structure by laser. The field of the inverse Faraday effect can lead to an increase in frequency and amplitude of this oscillations. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20648