期刊
CURRENT APPLIED PHYSICS
卷 19, 期 12, 页码 1362-1366出版社
ELSEVIER
DOI: 10.1016/j.cap.2019.08.025
关键词
Spin-orbit torque
资金
- KIST Institutional program [2V05750, 2E29410]
- National Research Council of Science & Technology (NST) [CAP-16-01-KIST]
- German Research Foundation [SI 1720/2-1]
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.
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