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Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Terahertz spintronics

MA 22.3: Vortrag

Dienstag, 2. April 2019, 14:30–14:45, H52

Simulation of Terahertz Radiation and Ultrafast Spin-Currents in Optically-Excited Magnetic Multilayers — •Dennis Nenno1, Rolf Binder2, and Hans Christian Schneider11Physics Department and Research Center OPTIMAS, TU Kaiserslautern — 2College of Optical Sciences, University of Arizona

Thin metallic bilayers have been shown to emit strong terahertz pulses due to the interplay of optically excited spin currents in ferromagnets and the Spin-Hall effect in heavy metals [1]. We present a novel theoretical scheme that allows us to determine both spectrum and temporal shape of the emitted pulses. We use structural details and the laser pulse parameters as an input. Our model itself relies only on ab initio material data and does not use any fit parameters. Optical effects are calculated from the nanometer to the micrometer scale for absorption and emission. The electron dynamics after laser excitation is simulated using the Boltzmann transport equation and solved numerically combining Particle-In-Cell approach and operator splitting technique [2]. Our model reliably reproduces experimental findings studying the variation of layer thickness [3] and excitation wavelength. We show how the terahertz generation efficiency can be improved and optimized using stacked layers in conjunction with terahertz anti-reflection coatings.

[1] T. Seifert et al., Nat. Photonics 10, 483 (2016)

[2] D. M. Nenno, B. Rethfeld, and H. C. Schneider, Phys. Rev. B (in press, 2018); arXiv:1807.04733

[3] G. Torosyan et al., Sci. Rep. 8, 1311 (2018)

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