Enhanced spin-orbit torque via interface engineering in Pt/CoFeB/MgO heterostructures
- Authors
- Lee, Hae-Yeon; Kim, Sanghoon; Park, June-Young; Oh, Young-Wan; Park, Seung-Young; Ham, Wooseung; Kotani, Yoshinori; Nakamura, Tetsuya; Suzuki, Motohiro; Ono, Teruo; Lee, Kyung-Jin; Park, Byong-Guk
- Issue Date
- 3월-2019
- Publisher
- AMER INST PHYSICS
- Citation
- APL MATERIALS, v.7, no.3
- Indexed
- SCIE
SCOPUS
- Journal Title
- APL MATERIALS
- Volume
- 7
- Number
- 3
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/67113
- DOI
- 10.1063/1.5084201
- ISSN
- 2166-532X
- Abstract
- Spin-orbit torque facilitates efficient magnetisation switching via an in-plane current in perpendicularly magnetised heavy-metal/ferromagnet heterostructures. The efficiency of spin-orbit-torque-induced switching is determined by the charge-to-spin conversion arising from either bulk or interfacial spin-orbit interactions or both. Here, we demonstrate that the spin-orbit torque and the resultant switching efficiency in Pt/CoFeB systems are significantly enhanced by an interfacial modification involving Ti insertion between the Pt and CoFeB layers. Spin pumping and X-ray magnetic circular dichroism experiments reveal that this enhancement is due to an additional interface-generated spin current of the non-magnetic interface and/or improved spin transparency achieved by suppressing the proximity-induced moment in the Pt layer. Our results demonstrate that interface engineering affords an effective approach to improve spin-orbit torque and thereby magnetisation switching efficiency. (C) 2019 Author(s).
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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