Direct X-Ray Detection of the Spin Hall Effect in CuBi

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 a...

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Bibliographic Details
Published in:Physical review. X 2022-09, Vol.12 (3), p.031032, Article 031032
Main Authors: Ruiz-Gómez, Sandra, Guerrero, Rubén, Khaliq, Muhammad W., Fernández-González, Claudia, Prat, Jordi, Valera, Andrés, Finizio, Simone, Perna, Paolo, Camarero, Julio, Pérez, Lucas, Aballe, Lucía, Foerster, Michael
Format: Article
Language:English
Subjects:
Bismuth base alloys
Circular polarization
Conductors
Conversion
Copper
Dichroism
Domain walls
Electrodes
Electromagnetism
Electron spin
Hall effect
Interfaces
Interfacial properties
Magnetic moments
Magnetism
Magneto-optics
Measurement methods
Memory devices
Monolayers
Multilayers
Spin-orbit interactions
Synchrotrons
X-rays
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Summary: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 CuL3,2absorption edges of highly Bi-doped Cu (Cu95Bi5). The detected x-ray magnetic circular dichroism signal corresponds to an induced magnetic moment of(2.2±0.5)×10−12μBA−1cm2per 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.
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.12.031032