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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.32: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P3
Analysis of Terahertz Emission Profiles from Optically-Excited Magnetic Multilayers — •Dennis Nenno1,2,3, Rolf Binder2, and Hans Christian Schneider1 — 1TU Kaiserslautern — 2University of Arizona — 3Max Planck Institut für Chemische Physik fester Stoffe
Optically excited spin-currents lead to efficient terahertz emission from heavy metals via the inverse Spin-Hall effect [1]. We have developed an approach to simulate the dynamics of hot carriers in metallic multilayers by using a particle-in-cell approach to solve the Boltzmann transport equation. Using this framework, we study the effects of spin-dependent hot-carrier dynamics, as well as terahertz emission from Fe/Pt samples [2]. Our model reliably reproduces experimental findings and we show how the simulation clarifies the importance of the growth conditions [3]. From a genereal transfer-matrix analysis we demonstrate how simple, widely-used relations such as E∝ ∂ j/∂ t and E∝ j between the field E and the dynamical charge current j in the emitter arise in the limiting cases of thin and thick layers.
[1] Seifert et al., Nat. Photon. 10, 483 (2016).
[2] Nenno, Binder & Schneider, Phys. Rev. Appl. 11, 054083 (2019).
[3] Nenno et al., Sci. Rep. 9, 13348 (2019).