Off-resonant all-optical switching dynamics in a ferromagnetic model system
arXiv:1803.01924 · doi:10.1103/PhysRevB.99.224421
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.
References in corpus (13)
- Semiconductor Spintronics
- Two types of all-optical magnetization switching mechanisms using femtosecond laser pulses
- Ab Initio Theory of Coherent Laser-Induced Magnetization in Metals
- Many-body theory of ultrafast demagnetization and angular momentum transfer in ferromagnetic transition metals
- Role of Spin Flips versus Spin Transport in Non Thermal Electrons Excited by Ultrashort Optical Pulses in Transition Metals
- Helicity-dependent all-optical domain wall motion in ferromagnetic thin films
- Accumulative magnetic switching of ultra-high-density recording media by circularly polarized light
- Magnetic switching dynamics in a ferrimagnetic two sub-lattice model including ultrafast exchange scattering
- Theory of light-induced effective magnetic field in Rashba ferromagnets
- Theory of inverse Faraday effect in disordered metal in THz regime
- Manipulation of Ferromagnets via the Spin-Selective Optical Stark Effect
- Optical spin transfer and spin-orbit torques in thin film ferromagnets
- Ultrafast spin-lattice relaxation in ferromagnets including effective spin-orbit fields