Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 23: Non-ultrafast magnetization dynamics
MA 23.7: Talk
Wednesday, March 14, 2018, 11:00–11:15, H 0112
Simulation of hot-electron spin currents in magnetic multilayers — Dennis M. Nenno1,2, Marius Weber Weber1, Rolf Binder2, and •Hans Christian Schneider1 — 1University of Kaiserslautern, Kaiserslautern, Germany — 2University of Arizona, Tucson, USA
``Hot electron'' spin-currents in magnetic heterostructures, which result from excitation by ultrafast optical pulses, have been described by different non-diffusive electron-transport calculations [1,2]. We present a computational approach to hot-electron transport in magnetic multilayers based on the particle-in-cell method for the Boltzmann transport equation. This approach allows one to simulate the electronic dynamics in the whole slab, including transmission coefficients and ab-initio material data. From the calculations, we extract typical transport coefficients and clarify the contribution of secondary carrier generation in the transition from ballistic to diffusive transport behavior.
We combine our transport model with a calculation of the emitted fields to determine the radiation spectrum from spintronic Terahertz emitters [3], and analyze both single emitters and arrays.
[1] M. Battiato et al., Phys. Rev. B 86, 024404 (2012).
[2] D. M. Nenno et al., Phys. Rev. B 94, 115102 (2016).
[3] T. Seifert et al., Nature Photonics 10, 483 (2016).