Effect of Rashba interaction at normal metal/insulator interface on spin-orbit torque of ferromagnet/normal metal/insulator trilayers
- Authors
- Park, Eun-Sang; Min, Byoung-Chul; Koo, Hyun Cheol; Kim, Kyoung-Whan; Lee, Kyung-Jin
- Issue Date
- 2019-12
- Publisher
- ELSEVIER
- Citation
- CURRENT APPLIED PHYSICS, v.19, no.12, pp.1362 - 1366
- Abstract
- Based on a spin drift-diffusion model, we theoretically investigate the spin-orbit torque in ferromagnet/normal metal/insulator trilayers with considering the Rashba interfacial spin-orbit coupling at the normal metal/insulator interface. We find that the spin-orbit torque shows the opposite normal-metal-thickness dependences for the bulk spin-orbit coupling effect in the normal metal layer and for the interfacial spin-orbit coupling effect at the normal metal/insulator interface, offering a way to disentangle these two spin-orbit coupling effects. Moreover, we show that the conventional interpretation based on the bulk spin-orbit coupling effect overestimates the spin Hall angle and underestimates the spin diffusion length of the normal metal layer, when the interfacial contribution is non-negligible. Our result, a concise analytic expression of the spin-orbit torque considering both bulk and interface spin-orbit coupling effects, will be useful to design and interpret experiments on spin-orbit torque experiments in ferromagnet/normal metal/insulator trilayers.
- Keywords
- CURRENT-DRIVEN DYNAMICS; MAGNETIZATION; Spin-orbit torque
- ISSN
- 1567-1739
- URI
- https://pubs.kist.re.kr/handle/201004/119281
- DOI
- 10.1016/j.cap.2019.08.025
- Appears in Collections:
- KIST Article > 2019
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