Effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films

Abstract We investigate the thickness optimization for maximum current-induced spin-orbit torque (SOT) generated by topological surface states (TSS’s) in a bilayer system comprising of a ferromagnetic layer coupled to a thin topological insulator (TI) film. We show that by reducing the TI thickness,...

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Autores principales:	Cong Son Ho, Yi Wang, Zhou Bin Siu, Seng Ghee Tan, Mansoor B. A. Jalil, Hyunsoo Yang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e2d1dc99548b444084d23afb504a9a25
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spelling	oai:doaj.org-article:e2d1dc99548b444084d23afb504a9a252021-12-02T11:40:13ZEffect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films10.1038/s41598-017-00911-42045-2322https://doaj.org/article/e2d1dc99548b444084d23afb504a9a252017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00911-4https://doaj.org/toc/2045-2322Abstract We investigate the thickness optimization for maximum current-induced spin-orbit torque (SOT) generated by topological surface states (TSS’s) in a bilayer system comprising of a ferromagnetic layer coupled to a thin topological insulator (TI) film. We show that by reducing the TI thickness, two competing effects on the SOT are induced: (i) the torque strength is stronger as the bulk contribution is decreased; (ii) on the other hand, the torque strength becomes suppressed due to increasing hybridization of the surface states. The latter is attributed to the opposite helicities of the coupled TSS’s. We theoretically model the interplay of these two effects and derive the optimal TI thickness to maximize the spin torque, which is estimated to be about 3–5 nm for typical Bi2Se3 films.Cong Son HoYi WangZhou Bin SiuSeng Ghee TanMansoor B. A. JalilHyunsoo YangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Cong Son Ho Yi Wang Zhou Bin Siu Seng Ghee Tan Mansoor B. A. Jalil Hyunsoo Yang Effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films
description	Abstract We investigate the thickness optimization for maximum current-induced spin-orbit torque (SOT) generated by topological surface states (TSS’s) in a bilayer system comprising of a ferromagnetic layer coupled to a thin topological insulator (TI) film. We show that by reducing the TI thickness, two competing effects on the SOT are induced: (i) the torque strength is stronger as the bulk contribution is decreased; (ii) on the other hand, the torque strength becomes suppressed due to increasing hybridization of the surface states. The latter is attributed to the opposite helicities of the coupled TSS’s. We theoretically model the interplay of these two effects and derive the optimal TI thickness to maximize the spin torque, which is estimated to be about 3–5 nm for typical Bi2Se3 films.
format	article
author	Cong Son Ho Yi Wang Zhou Bin Siu Seng Ghee Tan Mansoor B. A. Jalil Hyunsoo Yang
author_facet	Cong Son Ho Yi Wang Zhou Bin Siu Seng Ghee Tan Mansoor B. A. Jalil Hyunsoo Yang
author_sort	Cong Son Ho
title	Effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films
title_short	Effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films
title_full	Effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films
title_fullStr	Effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films
title_full_unstemmed	Effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films
title_sort	effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e2d1dc99548b444084d23afb504a9a25
work_keys_str_mv	AT congsonho effectofsurfacestatehybridizationoncurrentinducedspinorbittorqueinthintopologicalinsulatorfilms AT yiwang effectofsurfacestatehybridizationoncurrentinducedspinorbittorqueinthintopologicalinsulatorfilms AT zhoubinsiu effectofsurfacestatehybridizationoncurrentinducedspinorbittorqueinthintopologicalinsulatorfilms AT senggheetan effectofsurfacestatehybridizationoncurrentinducedspinorbittorqueinthintopologicalinsulatorfilms AT mansoorbajalil effectofsurfacestatehybridizationoncurrentinducedspinorbittorqueinthintopologicalinsulatorfilms AT hyunsooyang effectofsurfacestatehybridizationoncurrentinducedspinorbittorqueinthintopologicalinsulatorfilms
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Effect of surface state hybridization on current-induced spin-orbit torque in thin topological insulator films

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