Enhanced spin-orbit torque by engineering Pt resistivity in Pt/Co/AlOx structures
- Authors
- Lee, Jae Wook; Oh, Young-Wan; Park, Seung-Young; Figueroa, Adriana I.; van der Laan, Gerrit; Go, Gyungchoon; Lee, Kyung-Jin; Park, Byong-Guk
- Issue Date
- 3-8월-2017
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.96, no.6
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 96
- Number
- 6
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82583
- DOI
- 10.1103/PhysRevB.96.064405
- ISSN
- 2469-9950
- Abstract
- The magnetization direction in heavy-metal (HM)/ferromagnet bilayers can be electrically controlled by spin-orbit torque (SOT); however, the efficiency of the SOT which depends on the spin-orbit coupling of the HM layer or its spin-Hall angle has to be improved further for actual applications. In this study, we report a significant enhancement of the spin-Hall effect of Pt and resultant SOT in Pt/Co/AlOx structures by controlling the Pt resistivity. We observed that the effective spin-Hall angle increases about three times as the resistivity of Pt layer is increased 1.6 times by changing the Ar deposition pressure from 3 to 50 mTorr. This enhancement in effective spin-Hall angle is confirmed by the reduction in the critical current for SOT-induced magnetization switching. Furthermore, x-ray absorption spectroscopy analysis reveals a non-negligible contribution of the interfacial spin-orbit coupling to the effective spin-Hall angle. Our result, the efficient control of effective spin Hall angle by controlling the HM resistivity, paves the way to improved switching efficiency in SOT-active devices.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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