Topological insulators (TIs) show bright prospects in exerting spin–orbit torques (SOTs) and inducing magnetization switching in the adjacent ferromagnetic (FM) layer. However, a variation of the SOT efficiency values may be attributed to the ex situ deposition of the FM layer or the complex capping/decapping processes of the protection layer. We have employed an in situ fabrication of Bi2Se3/Fe heterostructures and investigated the SOT efficiency by spin torque ferromagnetic resonance. An enhanced SOT efficiency and large effective spin mixing conductance have been obtained especially below 100 K as compared with ex situ methods. The enhancement of the SOT efficiency is attributed to a much thinner interfacial layer (0.96 nm) in the in situ case and thus the enhanced interface spin transparency. Our results reveal the crucial role of interface engineering in exploring highly efficient TI-based spintronic devices.
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8 February 2021
Research Article|
February 08 2021
Highly efficient charge-to-spin conversion from in situ Bi2Se3/Fe heterostructures
Special Collection:
Spin-Orbit Torque (SOT): Materials, Physics, and Devices
Dapeng Zhu;
Dapeng Zhu
Department of Electrical and Computer Engineering, National University of Singapore
, 117576 Singapore
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Yi Wang
;
Yi Wang
Department of Electrical and Computer Engineering, National University of Singapore
, 117576 Singapore
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Shuyuan Shi;
Shuyuan Shi
Department of Electrical and Computer Engineering, National University of Singapore
, 117576 Singapore
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Kie-Leong Teo
;
Kie-Leong Teo
Department of Electrical and Computer Engineering, National University of Singapore
, 117576 Singapore
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Yihong Wu
;
Yihong Wu
Department of Electrical and Computer Engineering, National University of Singapore
, 117576 Singapore
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Hyunsoo Yang
Hyunsoo Yang
a)
Department of Electrical and Computer Engineering, National University of Singapore
, 117576 Singapore
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the Special Topic on Spin-Orbit Torque (SOT): Materials, Physics and Devices.
Appl. Phys. Lett. 118, 062403 (2021)
Article history
Received:
October 31 2020
Accepted:
January 18 2021
Citation
Dapeng Zhu, Yi Wang, Shuyuan Shi, Kie-Leong Teo, Yihong Wu, Hyunsoo Yang; Highly efficient charge-to-spin conversion from in situ Bi2Se3/Fe heterostructures. Appl. Phys. Lett. 8 February 2021; 118 (6): 062403. https://doi.org/10.1063/5.0035768
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