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20 August 2020 Hot-electron and magnetization dynamics in ferromagnetic model systems
Hans Christian Schneider
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Proceedings Volume 11470, Spintronics XIII; 114701W (2020) https://doi.org/10.1117/12.2569949
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
Ultrashort optical pulses applied to ferromagnets excite spin polarized electronic distributions far from equilibrium (which are often referred to as "hot electrons"). Such an ultrashort-pulse excitation can lead to demagnetization, but also to a loss of electronic spin polarization due to hot-electron transport in and out of ferromagnetic layers. I will present some of our work on both topics starting with a microscopic study of the of electron-phonon and exchange scattering dynamics in a two-sublattice model with itinerant electrons. I will also present results on spin-dependent transport [3] of optically excited hot electrons in ferromagnet-metal heterostructures which have gained interest as THz emitters in recent years. The numerical solution is achieved using a Particle-In-Cell approach to treat both transport and scattering effects in a numerically efficient way that is based on ab-initio input and can be easily adapted to different structures. If time permits, I will briefly discuss a microscopic model of the inverse Faraday effect. In the framework of a ferromagnetic Rashba system with a band gap, one can compute the complete switching dynamics including spin-orbit coupling, mean-field ferromagnetism and the effect of off-resonant optical fields/pulses.
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Hans Christian Schneider "Hot-electron and magnetization dynamics in ferromagnetic model systems", Proc. SPIE 11470, Spintronics XIII, 114701W (20 August 2020); https://doi.org/10.1117/12.2569949
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KEYWORDS
Systems modeling
Ferromagnetics
Electrons
Scattering
Computing systems
Heterojunctions
Numerical analysis
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