Above 400-K robust perpendicular ferromagnetic phase in a topological insulator
Abstract
Here, the quantum anomalous Hall effect (QAHE) that emerges under broken time-reversal symmetry in topological insulators (TIs) exhibits many fascinating physical properties for potential applications in nanoelectronics and spintronics. However, in transition metal–doped TIs, the only experimentally demonstrated QAHE system to date, the QAHE is lost at practically relevant temperatures. This constraint is imposed by the relatively low Curie temperature (Tc) and inherent spin disorder associated with the random magnetic dopants. We demonstrate drastically enhanced Tc by exchange coupling TIs to Tm3Fe5O12, a high-Tc magnetic insulator with perpendicular magnetic anisotropy. Signatures showing that the TI surface states acquire robust ferromagnetism are revealed by distinct squared anomalous Hall hysteresis loops at 400 K. Point-contact Andreev reflection spectroscopy confirms that the TI surface is spin-polarized. The greatly enhanced Tc, absence of spin disorder, and perpendicular anisotropy are all essential to the occurrence of the QAHE at high temperatures.
- Authors:
-
[3];
- Univ. of California, Riverside, CA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Pennsylvania State Univ., University Park, PA (United States)
- Arizona State Univ., Tempe, AZ (United States)
- Pennsylvania State Univ., University Park, PA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1389003
- Grant/Contract Number:
- SC0012670
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Science Advances
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 6; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin; Journal ID: ISSN 2375-2548
- Publisher:
- AAAS
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics
Citation Formats
Tang, Chi, Chang, Cui -Zu, Zhao, Gejian, Liu, Yawen, Jiang, Zilong, Liu, Chao -Xing, McCartney, Martha R., Smith, David J., Chen, Tingyong, Moodera, Jagadeesh S., and Shi, Jing. Above 400-K robust perpendicular ferromagnetic phase in a topological insulator. United States: N. p., 2017.
Web. doi:10.1126/sciadv.1700307.
Tang, Chi, Chang, Cui -Zu, Zhao, Gejian, Liu, Yawen, Jiang, Zilong, Liu, Chao -Xing, McCartney, Martha R., Smith, David J., Chen, Tingyong, Moodera, Jagadeesh S., & Shi, Jing. Above 400-K robust perpendicular ferromagnetic phase in a topological insulator. United States. https://doi.org/10.1126/sciadv.1700307
Tang, Chi, Chang, Cui -Zu, Zhao, Gejian, Liu, Yawen, Jiang, Zilong, Liu, Chao -Xing, McCartney, Martha R., Smith, David J., Chen, Tingyong, Moodera, Jagadeesh S., and Shi, Jing. Fri .
"Above 400-K robust perpendicular ferromagnetic phase in a topological insulator". United States. https://doi.org/10.1126/sciadv.1700307. https://www.osti.gov/servlets/purl/1389003.
@article{osti_1389003,
title = {Above 400-K robust perpendicular ferromagnetic phase in a topological insulator},
author = {Tang, Chi and Chang, Cui -Zu and Zhao, Gejian and Liu, Yawen and Jiang, Zilong and Liu, Chao -Xing and McCartney, Martha R. and Smith, David J. and Chen, Tingyong and Moodera, Jagadeesh S. and Shi, Jing},
abstractNote = {Here, the quantum anomalous Hall effect (QAHE) that emerges under broken time-reversal symmetry in topological insulators (TIs) exhibits many fascinating physical properties for potential applications in nanoelectronics and spintronics. However, in transition metal–doped TIs, the only experimentally demonstrated QAHE system to date, the QAHE is lost at practically relevant temperatures. This constraint is imposed by the relatively low Curie temperature (Tc) and inherent spin disorder associated with the random magnetic dopants. We demonstrate drastically enhanced Tc by exchange coupling TIs to Tm3Fe5O12, a high-Tc magnetic insulator with perpendicular magnetic anisotropy. Signatures showing that the TI surface states acquire robust ferromagnetism are revealed by distinct squared anomalous Hall hysteresis loops at 400 K. Point-contact Andreev reflection spectroscopy confirms that the TI surface is spin-polarized. The greatly enhanced Tc, absence of spin disorder, and perpendicular anisotropy are all essential to the occurrence of the QAHE at high temperatures.},
doi = {10.1126/sciadv.1700307},
journal = {Science Advances},
number = 6,
volume = 3,
place = {United States},
year = {Fri Jun 23 00:00:00 EDT 2017},
month = {Fri Jun 23 00:00:00 EDT 2017}
}
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