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MA: Fachverband Magnetismus

MA 63: Spin: Transport, Orbitronics and Hall Effects III

MA 63.6: Vortrag

Freitag, 20. März 2020, 10:45–11:00, HSZ 403

Engineering the emission of spintronic terahertz emitters based on defect densities — •Laura Scheuer¹, Dennis Nenno¹, Garik Torosyan², Alexander Brodyanski³, Rolf H. Binder⁴, Hans C. Schneider¹, Rene Beigang¹, and Evangelos Th. Papaioannou¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany — ²Photonic Center Kaiserslautern, Kaiserslautern, Germany — ³Institut für Oberflächen- und Schichtanalytik (IFOS) and Landesforschungszentrum OPTIMAS, Kaiserslautern, Germany — ⁴College of Optical Sciences, University of Arizona, Tucson, USA

The field of THz spintronics aims to control ultrafast spin currents that could enable novel applications and devices operating in the THz range. While the generation of pulsed broadband THz radiation utilizing the inverse spin Hall effect in ferromagnetic/nonmagnetic (FM/NM) metallic heterostructures was investigated considering the influence of the layer thickness, substrate, geometry and excitation energy, the influence of the crystal structure was not yet studied. Here, we experimentally show the role of the defect density of the crystal structure. Modifying the defect density results in a change of the elastic electron-defect scattering lifetime in Fe and Pt and of the interface transmission for spin-polarized non-equilibrium electrons. Supporting the experimental findings, a theoretical model is employed, accounting for the differences in the elastic electron scattering lifetime and for the transmission of spin-polarized hot carriers at the FM/NM interface.