Quantifying interface and bulk contributions to spin-orbit torque in magnetic bilayers
- Authors
- Fan, Xin; Celik, Halise; Wu, Jun; Ni, Chaoying; Lee, Kyung-Jin; Lorenz, Virginia O.; Xiao, John Q.
- Issue Date
- 1월-2014
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE COMMUNICATIONS, v.5
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 5
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/99640
- DOI
- 10.1038/ncomms4042
- ISSN
- 2041-1723
- Abstract
- Spin-orbit interaction-driven phenomena such as the spin Hall and Rashba effect in ferromagnetic/heavy metal bilayers enables efficient manipulation of the magnetization via electric current. However, the underlying mechanism for the spin-orbit interaction-driven phenomena remains unsettled. Here we develop a sensitive spin-orbit torque magnetometer based on the magneto-optic Kerr effect that measures the spin-orbit torque vectors for cobalt iron boron/platinum bilayers over a wide thickness range. We observe that the Slonczewski-like torque inversely scales with the ferromagnet thickness, and the field-like torque has a threshold effect that appears only when the ferromagnetic layer is thinner than 1 nm. Through a thickness-dependence study with an additional copper insertion layer at the interface, we conclude that the dominant mechanism for the spin-orbit interaction-driven phenomena in this system is the spin Hall effect. However, there is also a distinct interface contribution, which may be because of the Rashba effect.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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