Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures
Abstract
The possible realization of dissipationless chiral edge current in a topological insulator/magnetic insulator heterostructure is based on the condition that the magnetic proximity exchange coupling at the interface is dominated by the Dirac surface states of the topological insulator. We report a polarized neutron reflectometry observation of Dirac-electron-mediated magnetic proximity effect in a bulk-insulating topological insulator (Bi0.2Sb0.8)2Te3/magnetic insulator EuS heterostructure. We are able to maximize the proximity-induced magnetism by applying an electrical back gate to tune the Fermi level of topological insulator to be close to the Dirac point. A phenomenological model based on diamagnetic screening is developed to explain the suppressed proximity-induced magnetism at high carrier density. Our work paves the way to utilize the magnetic proximity effect at the topological insulator/magnetic insulator heterointerface for low-power spintronic applications.
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Pennsylvania State Univ., University Park, PA (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Pennsylvania State Univ., University Park, PA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1425052
- Alternate Identifier(s):
- OSTI ID: 1406394
- Report Number(s):
- BNL-114861-2017-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1802018
- Grant/Contract Number:
- SC0012704; SC0001299/DE-FG02-09ER46577
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 20; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Li, Mingda, Song, Qichen, Zhao, Weiwei, Garlow, Joseph A., Liu, Te-Huan, Wu, Lijun, Zhu, Yimei, Moodera, Jagadeesh S., Chan, Moses H. W., Chen, Gang, and Chang, Cui-Zu. Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures. United States: N. p., 2017.
Web. doi:10.1103/PhysRevB.96.201301.
Li, Mingda, Song, Qichen, Zhao, Weiwei, Garlow, Joseph A., Liu, Te-Huan, Wu, Lijun, Zhu, Yimei, Moodera, Jagadeesh S., Chan, Moses H. W., Chen, Gang, & Chang, Cui-Zu. Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures. United States. https://doi.org/10.1103/PhysRevB.96.201301
Li, Mingda, Song, Qichen, Zhao, Weiwei, Garlow, Joseph A., Liu, Te-Huan, Wu, Lijun, Zhu, Yimei, Moodera, Jagadeesh S., Chan, Moses H. W., Chen, Gang, and Chang, Cui-Zu. Wed .
"Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures". United States. https://doi.org/10.1103/PhysRevB.96.201301. https://www.osti.gov/servlets/purl/1425052.
@article{osti_1425052,
title = {Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures},
author = {Li, Mingda and Song, Qichen and Zhao, Weiwei and Garlow, Joseph A. and Liu, Te-Huan and Wu, Lijun and Zhu, Yimei and Moodera, Jagadeesh S. and Chan, Moses H. W. and Chen, Gang and Chang, Cui-Zu},
abstractNote = {The possible realization of dissipationless chiral edge current in a topological insulator/magnetic insulator heterostructure is based on the condition that the magnetic proximity exchange coupling at the interface is dominated by the Dirac surface states of the topological insulator. We report a polarized neutron reflectometry observation of Dirac-electron-mediated magnetic proximity effect in a bulk-insulating topological insulator (Bi0.2Sb0.8)2Te3/magnetic insulator EuS heterostructure. We are able to maximize the proximity-induced magnetism by applying an electrical back gate to tune the Fermi level of topological insulator to be close to the Dirac point. A phenomenological model based on diamagnetic screening is developed to explain the suppressed proximity-induced magnetism at high carrier density. Our work paves the way to utilize the magnetic proximity effect at the topological insulator/magnetic insulator heterointerface for low-power spintronic applications.},
doi = {10.1103/PhysRevB.96.201301},
journal = {Physical Review B},
number = 20,
volume = 96,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}
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