Publication: Direct x-ray detection of the spin hall effect in CuBi
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American Physical Society (APS)
The spin Hall effect and the inverse spin Hall effect are important spin-charge conversion mechanisms. The direct spin Hall effect induces a surface spin accumulation from a transverse charge current due to spin-orbit coupling even in nonmagnetic conductors. However, most detection schemes involve additional interfaces, leading to large scattering in reported data. Here we perform interface-free x-ray spectroscopy measurements at the Cu L_(3;2) absorption edges of highly Bi-doped Cu (Cu_(95)Bi_5). The detected x-ray magnetic circular dichroism signal corresponds to an induced magnetic moment of (2.2 + 0.5) x 10^(-12) mu(B) A^(-1) cm^(2) per Cu atom averaged over the probing depth, which is of the same order of magnitude as found for Pt measured by magneto-optics. The results highlight the importance of interface-free measurements to assess material parameters and the potential of CuBi for spin-charge conversion applications.
©2022 American Physical Society We thank Roopali Kukreja for answering our questions about Ref.  and Sergio O. Valenzuela and Olivier Fruchart for critical reading of the manuscript. We acknowledge M. R. Osorio and D. Granados at IMDEA-nanoscience nanofabri- cation center for their help in the lithography process. This work has been partially funded by MCIN/AEI/10.13039/501100011033 through Projects No. FIS2016-78591-C3-1- R, No. MAT2017-87072-C4-2-P, No. RTI2018-097895-B- C42, No. RTI2018-095303-B-C53, and No. PID2020 - 117024GB-C43 and by the Comunidad de Madrid through Project No. NANOMAGCOST-CM P2018/NMT-4321. IMDEA Nanociencia acknowledges support from the Severo Ochoa Programme for Centres of Excellence in R&D (Grants No. SEV-2016-0686 and No. CEX2020- 001039-S) . The work has been supported by the ALBA in- house research program. We thank the Spanish National Center of Electron Microscopy for Scanning Electron Microscopy measurements. M. W. K. acknowledges funding from Horizon 2020 Marie Sk ? odowska-Curie COFUND DOC-FAM, with Grant agreement No. 754397.