Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.49: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Spin-Hall-Angle measurements on magnetic heterostructures with bismuth alloys using THz-spectroscopy — •Tristan Winkel1, Finn-Frederik Stiewe1, Jakob Walowski1, Christian Denker2, and Markus Münzenberg1 — 1Institute of Physics, University Greifswald, Germany — 2EMCC DR. RASEK, Ebermannstadt, Deutschland
Spin Hall angle measurements are important for spin device design. THz spectroscopy provides effective means to measure spin Hall angles. In our study, we investigate THz pulses generated by fs laser excitations in magnetic heterostructures based on spin currents, together with an LT-GaAs Auston switch as a detector. The magnetic heterostructures consist of a CoFeB layer and a heavy metal layer such as bismuth alloys [1]. From the THz measurement, we can extrapolate the spin Hall angle of the heavy metal. The data is then used to build optimized spin Hall nano-oscillators for the fabrication of a neuromorphic computer chip [2]. Our technical approach offers great potential for wide-ranging applications due to its simplicity.
[1] Caiyun Hong et al., Advanced Electronic Materials. 10.1002/aelm.201700632 (2018)
[2] M. Zahedinejad et al., Appl. Phys. Lett. 112, 132404 (2018)