Optical detection of spin-orbit torque in Ta/CoFeB and W/CoFeB bilayers
- Authors
- Kim, Sumin; Kong, Byung Kwon; Kim, Tae Wook; Choi, Gyung-Min
- Issue Date
- May-2024
- Publisher
- Elsevier B.V.
- Keywords
- Magneto-optical Kerr effect (MOKE); Optical detection; Spin-orbit torque
- Citation
- Current Applied Physics, v.61, pp 1 - 6
- Pages
- 6
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- Current Applied Physics
- Volume
- 61
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/110344
- DOI
- 10.1016/j.cap.2024.02.001
- ISSN
- 1567-1739
1878-1675
- Abstract
- The spin Hall effect in heavy metals generates a spin-orbit torque (SOT) on a ferromagnet. To date, most SOT studies have been conducted using electrical methods, such as harmonic Hall response and spin-torque ferromagnetic resonance. In this study, we investigated SOT in heavy metals, Ta and W, using an optical method of magneto-optical Kerr effect. The optical method has the advantage of spatial resolution that is used for a clear separation between the SOT and the Oersted field. From a quantitative comparison between the SOT and the Oersted field, we determined the lower bounds of the spin Hall angle of 0.12 and 0.21 for Ta and W, respectively. From a thickness dependence of the spin Hall conductivity, we determined the spin diffusion length of 4 nm for both Ta and W. © 2024 Korean Physical Society
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Collections - Graduate School > Energy Science > 1. Journal Articles
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