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arXiv · 1803.01924

Off-resonant all-optical switching dynamics in a ferromagnetic model system

Christiane Scholl·Svenja Vollmar·Hans Christian Schneider
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Abstract

We present a theoretical study of the the effects of off-resonant polarized optical fields on a ferromagnetic model system. We determine the light-induced dynamics of itinerant carriers in a system that includes magnetism at the mean-field level and spin-orbit coupling. We investigate an all-optical switching process for ferromagnets, which is close to the one proposed by Qaiumzadeh et al. [Phys. Rev. B 88, 064416] for the inverse Faraday effect. By computing the optically driven coherent dynamics together with incoherent scattering mechanisms we go beyond a perturbation expansion in powers of the optical field. We find an important contribution of a dynamic Stark effect coupling of the Raman type between the magnetic bands, which leads to a polarization-dependent effect on the magnetization that may support or oppose switching, but also contributes to demagnetization via an increase in electronic energy.

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Christiane Scholl, Svenja Vollmar, Hans Christian Schneider. 2018-03-05. Off-resonant all-optical switching dynamics in a ferromagnetic model system. https://doi.org/10.1103/physrevb.99.224421

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