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Epitaxially grown multilayers, Mn3PtN/Cu/Co20Fe60B20, with a thickness of the Cu spacer layers from 0 to 5 nm, were prepared on (100)-oriented MgO substrates. The multilayer exhibited a pronounced exchange bias field in the absence of a Cu spacer, which became minimal with the introduction of a finite Cu spacer. We measured spin-torque ferromagnetic resonance to estimate the spin-Hall angle (θSH) in the multilayers, emphasizing the role of the Cu spacer layer in the spin current transport across the interface. We found that both θSH and the effective Gilbert damping parameter decrease significantly upon the insertion of Cu, suggesting that the spin-orbit torque (SOT) primarily originates from interfaces. A correlation between SOT and exchange bias with the Cu spacer layer indicates the significance of interfacial contributions. These experimental results demonstrate the critical importance of interfacial engineering in antiferromagnetic-based spintronics, revealing an alternative mechanism for generating spin torque in magnetic heterostructures that is essential for controlling magnetization dynamics in energy-efficient spintronics applications.

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• In Copyright
  

  ©2026 American Physical Society

Keyword: Antiferromagnet, Spin Hall effect

Date published: 2026-01-30

Publisher: American Physical Society (APS)

Journal:

• Physical Review Materials (ISSN: 24759953) vol. 10 issue. 1 014415

Funding:

• Department of Science and Technology, Ministry of Science and Technology, India
• Indian Institute of Technology (BHU) Varanasi

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6173

First published URL: https://doi.org/10.1103/4448-xznx

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Updated at: 2026-02-07 16:30:10 +0900

Published on MDR: 2026-02-07 12:34:48 +0900