SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 11: Posters Magnetism III

MA 11.19: Poster

Wednesday, September 29, 2021, 13:30–16:30, P

Spin-Hall-Angle measurements on magnetic heterostructures using THz-spectroscopy — •Tristan Winkel, Finn-Frederik Stiewe, Tobias Kleinke, Ulrike Martens, Jakob Walowski, and Markus Münzenberg — Institute of Physics, University Greifswald, Germany

Spin Hall angle measurements are important for spin device design. The data is used to build optimized spin Hall nano-oscillators for the fabrication of a neuromorphic computer chip [1]. 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. From the THz measurement, we can extrapolate the spin Hall angle of the heavy metal. Our technical approach offers great potential for wide-ranging applications due to its simplicity.

[1] M. Zahedinejad et al., Appl. Phys. Lett. 112, 132404 (2018)

Funding by: EU Horizon 2020, Spinage