Tom Seifert, Ngoc Minh Tran, Oliver Gueckstock, Seyed Mohammedreza Rouzegar, Lukas Nadvornik, Samridh Jaiswal, Gerhard Jakob, Vasily V. Temnov, Markus Muenzenberg, Martin Wolf, Mathias Klaeui, and Tobias Kampfrath:
J. Phys. D: Appl. Phys. 51 (36), 364003 (2018), pp.8;
arXiv:1805.02193 [cond-mat.mtrl-sci] (2018), pp. 13;
DOI: arXiv:1805.02193 [cond-mat.mtrl-sci]
Identifying materials with an efficient spin-to-charge conversion is crucial for future spintronic applications. The spin Hall effect is a central mechanism as it allows for the interconversion of spin and charge currents. Spintronic material research aims at maximizing its efficiency, quantified by the spin Hall angle ΘSH and the spin-current relaxation length λrel. We develop an all-optical method with large sample throughput that allows us to extract ΘSH and λrel. Employing terahertz spectroscopy, we characterize magnetic metallic heterostructures involving Pt, W and Cu80Ir20 in terms of their optical and spintronic properties. We furthermore find indications that the interface plays a minor role for the spin-current transmission. Our analytical model is validated by the good agreement with literature DC values. These findings establish terahertz emission spectroscopy as a reliable tool complementing the spintronics workbench.
The original publication is available by link DOI: 10.1088/1361-6463/aad536