Anisotropic and Controllable Nonlocal Damping in Exchange Bias Bilayers
The physics at antiferromagnetic (AFM)/ferromagnetic (FM) interfaces, including exchange bias (EB) and spin current, are of key interest in spintronics. However, the relationship between the EB effect and spin current is still controversial. Here, we have observed anisotropic and controllable nonlocal damping in a typical EB system, i.e., Co/CoO bilayers. Oblique deposition of Co film with an in situ oxidized CoO top layer generates a controllable uniaxial magnetic anisotropy (UMA), and leads to reconfigurable orientations of the average interfacial uncompensated AFM spins. The Gilbert damping constant is larger in the hard axis than in the easy axis of UMA, which can be further enhanced by the training effect because of the reorientation of the average uncompensated AFM spins. Our work provides insight into the effect of EB on nonlocal damping and paves a new way to control the spin current in AFM spintronic devices.
Authors
- Qinghai Song (ORCID: https://orcid.org/0000-0003-1048-411X)
- Chris Van Haesendonck (ORCID: https://orcid.org/0000-0003-4944-1045)
- Haoliang Liu (ORCID: https://orcid.org/0000-0002-1606-1858)
- Rongpei Shi (ORCID: https://orcid.org/0000-0002-5007-4249)
- C. Wang (ORCID: https://orcid.org/0009-0004-5833-6540)
- Zhe Li (ORCID: https://orcid.org/0000-0002-6428-1222)
- Mei Du (ORCID: https://orcid.org/0000-0002-2478-0860)
- Yanchen Luo
Institutions
- Shenzhen Institute of Information Technology (CN)
- Harbin Institute of Technology (CN)
- Laboratoire de physique des Solides (FR)
- Hong Kong Science and Technology Parks Corporation (HK)
- Photonic Systems (United States) (US)
- Guangdong Institute of Intelligent Manufacturing (CN)
- Advanced Materials and Devices (United States) (US)
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology (CN)
- KU Leuven (BE)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2025-08-11
- DOI
- https://doi.org/10.1021/acsami.5c09474
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- Science, Technology and Innovation Commission of Shenzhen Municipality
- State Key Laboratory of Luminescent Materials and Devices
- National Key Research and Development Program of China
- Basic and Applied Basic Research Foundation of Guangdong Province