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We report on fully epitaxial Ru/Cu heterostructures fabricated with interface engineering and nanolayer insertions consisting of Cu (1nm)/Ru (1nm) structures with different numbers of periods. The atomically controlled interface was confirmed by the high-resolution high-angle annular dark-field scanning transmission electron microscopy, and the epitaxial relationship persists even in the hybrid nanolayer insertion structures. The spin current generation was detected by the measurement of unidirectional spin Hall magnetoresistance, and the effective damping-like spin Hall efficiency (ξ_DL) was further quantitatively evaluated by the spin-torque ferromagnetic resonance with thickness dependence of the ferromagnetic layer. It is found that the sharp interface Ru/Cu film has a sizeable ξ_DL of −2.2% and the insertion of Cu/Ru nanolayers at the interface can increase the ξ_DL value to −3.7%. The former could be attributed to the interface spin-orbit filtering effect and the latter may be further understood by the intrinsic contribution from the local electronic structure tuning due to the lattice distortion near the interface. A large effective spin Hall conductivity is achieved to be (3~5)×10^5 ℏ/2eΩ^(−1)m^(−1) in the epitaxial Ru/Cu hybrid nanolayers, which is in the same range as that of platinum.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

  © 2023 IOP Publishing Ltd
  
  This is an author-created, un-copyedited version of an article accepted for publication/published
  in Nanotechnology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at　https://iopscience.iop.org/article/10.1088/1361-6528/acda36

Keyword: charge-to-spin conversion, epitaxial Ru/Cu heterostructures, interface control

Date published: 2023-09-03

Publisher: IOP Publishing

Journal:

• NANOTECHNOLOGY (ISSN: 09574484) vol. 34 issue. 36 p. 365704-365704

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4264

First published URL: https://doi.org/10.1088/1361-6528/acda36

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Updated at: 2024-06-19 08:30:09 +0900

Published on MDR: 2024-06-19 08:30:09 +0900