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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.35: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P3
Inverse spin Hall Effect in ferromagnet/heavy metal bilayers with different spin orbit coupling materials and interlayers — •Mohamed Amine Wahada1, Wolfgang Hoppe2, Georg Woltersdorf2, and Stuart S. P. Parkin1 — 1Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle (Saale), Germany — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle, Germany
Spin pumping combined with the inverse spin Hall Effect (ISHE) is an essential tool in the field of Spintronics that can probe the dynamics of the magnetization of a ferromagnet when this latter is attached to a heavy metal or a spin orbit coupling (SOC) material. By using amplified femtosecond laser pulses, we generate ultrafast spin current pulses into heavy metal layers which are converted, via the ISHE, into ultrafast charge current pulses [1]. An rf probe tip is used to pick up these pulses and detect them in a fast sampling oscilloscope. Although the resultant waveform only has a bandwidth of about 30 GHz quantitatively (compared to the THz bandwidth of the electo-optical sampling method), this quick method provides a qualitative measure of the ISHE. Here, we investigate the influence of an MgO interlayer on the transmission of the spin current depending on the thickness of the oxide. The influence of other metal and oxide interlayers is investigated in terms of the modification of the interface transparency for the spin current pulses. In addition, different SOC materials ranging from heavy metals, topological insulators to Weyl semi-metals are compared. [1] T. Seifert et al. Nature Photon 10, 483-488 (2016)