Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.61: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Probing the spin Hall effect in YIG/Cu1−xIrx bilayers at DC and terahertz frequencies — •Joel Cramer1,2, Tom Seifert3, Alexander Kronenberg1, Felix Fuhrmann1, Franziska Martin1, Gerhard Jakob1, Martin Jourdan1, Tobias Kampfrath3, and Mathias Kläui1,2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany — 3Abteilung Physikalische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
The effective generation and detection of pure spin currents is a crucial ingredient for next-generation spintronic applications. The spin Hall effect and its inverse are in the focus of research, as they allow for an interconversion of charge and spin currents [1]. We investigate the inverse spin Hall effect of Cu1−xIrx thin films on yttrium iron garnet for a large range of Ir concentrations (0.05 x 0.7) [2]. Spin currents are triggered through the spin Seebeck effect, either by a DC temperature gradient or by ultrafast optical heating of the metal layer. The generated spin Hall current is detected by electrical contacts or measurement of the emitted THz radiation. With both approaches, we observe the same complex, non-monotonous concentration dependence. The coinciding results obtained for DC and ultrafast stimuli show that the studied material allows for efficient spin-to-charge conversion even on ultrafast timescales, thus enabling a transfer of established spintronic measurement schemes into the terahertz regime. [1] Sinova et al., Rev. Mod. Phys. 87, 1213 (2015) [2] Cramer et al., arXiv:1709.01890