Journal
CURRENT APPLIED PHYSICS
Volume 19, Issue 8, Pages 917-923Publisher
ELSEVIER
DOI: 10.1016/j.cap.2019.04.015
Keywords
Topological insulator; Spin-momentum locking; Electrical spin detection; Non-local current
Funding
- NRF of Korea [2018R1A3B1052827]
- SRC Center for Quantum Coherence in Condensed Matter [2016R1A5A1008184]
- Institute for Basic Science [IBS-R014-D1]
- National Research Foundation (NRF) of Korea through the SRC [2018R1A5A6075964]
- Max Planck-POSTECH Center for Complex Phase Materials in Korea (MPK) [2016K1A4A4A01922028]
- National Research Foundation of Korea [2018R1A5A6075964, 2016R1A5A1008184] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Spin-momentum locked (SML) topological surface state (TSS) provides exotic properties for spintronics applications. The spin-polarized current, which emerges owing to the SML, can be directly detected by performing spin potentiometric measurement. We observed spin-polarized current using a bulk insulating topological insulator (TI), Bi1.5Sb0.5Te1.7Se1.3, and Co as the ferromagnetic spin probe. The spin voltage was probed with varying the bias current, temperature, and gate voltage. Moreover, we observed non-local spin-polarized current, which is regarded as a distinguishing property of TIs. The spin-polarization ratio of the non-local current was larger than that of the local current. These findings could reveal a more accurate approach to determine spin-polarization ratio at the TSS.
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