The DOI matches its Crossref record; 13 of the 13 references it cites were found in a registry or an index.
Electrical Detection of Spin-Polarized Surface States Conduction in (Bi0.53Sb0.47)2Te3 Topological Insulator
Abstract
Strong spin-orbit interaction and time-reversal symmetry in topological insulators enable the spin-momentum locking for the helical surface states. To date, however, there has been little report of direct electrical spin injection/detection in topological insulator. In this Letter, we report the electrical detection of spin-polarized surface states conduction using a Co/Al2O3 ferromagnetic tunneling contact in which the compound topological insulator (Bi0.53Sb0.47)2Te3 was used to achieve low bulk carrier density. Resistance (voltage) hysteresis with the amplitude up to about 10 Ω was observed when sweeping the magnetic field to change the relative orientation between the Co electrode magnetization and the spin polarization of surface states. The two resistance states were reversible by changing the electric current direction, affirming the spin-momentum locking in the topological surface states. Angle-dependent measurement was also performed to further confirm that the abrupt change in the voltage (resistance) was associated with the magnetization switching of the Co electrode. The spin voltage amplitude was quantitatively analyzed to yield an effective spin polarization of 1.02% for the surface states conduction in (Bi0.53Sb0.47)2Te3. Our results show a direct evidence of spin polarization in the topological surface states conduction. It might open up great opportunities to explore energy-efficient spintronic devices based on topological insulators.
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Cites
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Cited by
Colloquium : Topological band theory
Bansil, A., Lin, H., & Das, T. (2016) · Reviews of Modern Physics · doi:10.1103/revmodphys.88.021004 · Cited by 1,587
Interface-induced phenomena in magnetism
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Room-Temperature Spin-Orbit Torque Switching Induced by a Topological Insulator
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Zhang, H., Zhang, X., Liu, C., Lee, S.-T., & Jie, J. (2016) · ACS Nano · doi:10.1021/acsnano.6b00272 · Cited by 408
Metadata
- Authors
- Tang, J., Chang, L.-T., Kou, X., Murata, K., Choi, E. S., Lang, M., Fan, Y., Jiang, Y., Montazeri, M., Jiang, W., Wang, Y., He, L., & Wang, K. L.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-08-28
- Volume
- 14
- Issue
- 9
- Pages
- 5423-5429
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2081994940
- Cited by
- 167
- References
- 13
- FWCI
- 11.15
- Type
- journal article
- Language
- en
- Open access
- closed
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