Spin-orbit torques in normal metal/Nb/ferromagnet heterostructures
- Authors
- Lee, Min Hyeok; Go, Gyungchoon; Kim, Yong Jin; Cha, In Ho; Kim, Gyu Won; Kim, Taehyun; Lee, Kyung-Jin; Kim, Young Keun
- Issue Date
- 26-10월-2021
- Publisher
- NATURE PORTFOLIO
- Citation
- SCIENTIFIC REPORTS, v.11, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 11
- Number
- 1
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136002
- DOI
- 10.1038/s41598-021-99745-4
- ISSN
- 2045-2322
- Abstract
- Quantifying the spin-orbit torque (SOT) efficiency with changing the layer thickness is crucial for understanding the physical background of SOT. This study investigates the Nb-thickness-dependent SOT efficiency of two types of layered heterostructures: Ta/Nb/CoFeB and Pt/Nb/CoFeB. We find that the Nb thickness dependence of the SOT efficiency in the two samples is quite different. In the Pt/Nb series, the SOT sign changes according to the thickness variation because Pt and Nb have different spin-orbit coupling signs. We observe the resulting reversal in switching polarity through current-induced SOT switching experiments. However, due to the same spin-orbit coupling signs of Ta and Nb, no such polarity reversal was observed in Ta/Nb series. Further, we extract the spin diffusion length of Nb in each heterostructure. These results provide a systematic understanding of the material- and thickness-dependent SOT characteristics.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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