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Identifying materials with an efficient spin-to-charge conversion is crucialfor future spintronic applications. The spin Hall effect is a central mechanismas it allows for the interconversion of spin and charge currents. Spintronicmaterial research aims at maximizing its efficiency, quantified by the spinHall angle $\Theta_{\textrm{SH}}$ and the spin-current relaxation length$\lambda_{\textrm{rel}}$. We develop an all-optical method with large samplethroughput that allows us to extract $\Theta_{\textrm{SH}}$ and$\lambda_{\textrm{rel}}$. Employing terahertz spectroscopy, we characterizemagnetic metallic heterostructures involving Pt, W and Cu$_{80}$Ir$_{20}$ interms of their optical and spintronic properties. We furthermore findindications that the interface plays a minor role for the spin-currenttransmission. Our analytical model is validated by the good agreement withliterature DC values. These findings establish terahertz emission spectroscopyas a reliable tool complementing the spintronics workbench.

Terahertz spectroscopy for all-optical spintronic characterization of the spin-Hall-effect metals Pt, W and Cu$_{80}$Ir$_{20}$