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Title: Structural and proximity-induced ferromagnetic properties of topological insulator-magnetic insulator heterostructures

Abstract

The spontaneously broken time reversal symmetry can lead to the formation of an energy gap in the Dirac spectrum of the surface states of a topological insulator (TI) which can consequently give rise to a variety of interesting phenomena potentially useful for spintronics. In this work, we couple a non-magnetic TI to a high Curie temperature TC magnetic insulator to induce strong exchange interaction via the proximity effect. We have successfully grown 5 quintuple layer thick ternary TI (BixSb1-x)2Te3 films on atomically flat yttrium iron garnet (YIG) film with the combination of molecular beam epitaxy and pulsed laser deposition, in which the Fermi level position relative to the Dirac point is varied by controlling the Bi:Sb ratio. The anomalous Hall effect (AHE) and suppressed weak antilocalization (WAL) measured under out of plane magnetic fields reveal that the TI surface in contact with YIG is magnetized. Our high-quality (BixSb1-x)2Te3/Y IG heterostructure provides a tunable system for exploring the quantum anomalous Hall effect (QAHE) at higher temperatures in TI-based spintronic devices.

Authors:
; ; ; ; ; ORCiD logo
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:
1239443
Alternate Identifier(s):
OSTI ID: 1371206; OSTI ID: 1421031
Grant/Contract Number:  
SC0012670
Resource Type:
Published Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Name: AIP Advances Journal Volume: 6 Journal Issue: 5; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Jiang, Zilong, Chang, Cui-Zu, Tang, Chi, Zheng, Jian-Guo, Moodera, Jagadeesh S., and Shi, Jing. Structural and proximity-induced ferromagnetic properties of topological insulator-magnetic insulator heterostructures. United States: N. p., 2016. Web. doi:10.1063/1.4943061.
Jiang, Zilong, Chang, Cui-Zu, Tang, Chi, Zheng, Jian-Guo, Moodera, Jagadeesh S., & Shi, Jing. Structural and proximity-induced ferromagnetic properties of topological insulator-magnetic insulator heterostructures. United States. https://doi.org/10.1063/1.4943061
Jiang, Zilong, Chang, Cui-Zu, Tang, Chi, Zheng, Jian-Guo, Moodera, Jagadeesh S., and Shi, Jing. Sun . "Structural and proximity-induced ferromagnetic properties of topological insulator-magnetic insulator heterostructures". United States. https://doi.org/10.1063/1.4943061.
@article{osti_1239443,
title = {Structural and proximity-induced ferromagnetic properties of topological insulator-magnetic insulator heterostructures},
author = {Jiang, Zilong and Chang, Cui-Zu and Tang, Chi and Zheng, Jian-Guo and Moodera, Jagadeesh S. and Shi, Jing},
abstractNote = {The spontaneously broken time reversal symmetry can lead to the formation of an energy gap in the Dirac spectrum of the surface states of a topological insulator (TI) which can consequently give rise to a variety of interesting phenomena potentially useful for spintronics. In this work, we couple a non-magnetic TI to a high Curie temperature TC magnetic insulator to induce strong exchange interaction via the proximity effect. We have successfully grown 5 quintuple layer thick ternary TI (BixSb1-x)2Te3 films on atomically flat yttrium iron garnet (YIG) film with the combination of molecular beam epitaxy and pulsed laser deposition, in which the Fermi level position relative to the Dirac point is varied by controlling the Bi:Sb ratio. The anomalous Hall effect (AHE) and suppressed weak antilocalization (WAL) measured under out of plane magnetic fields reveal that the TI surface in contact with YIG is magnetized. Our high-quality (BixSb1-x)2Te3/Y IG heterostructure provides a tunable system for exploring the quantum anomalous Hall effect (QAHE) at higher temperatures in TI-based spintronic devices.},
doi = {10.1063/1.4943061},
journal = {AIP Advances},
number = 5,
volume = 6,
place = {United States},
year = {Sun May 01 00:00:00 EDT 2016},
month = {Sun May 01 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.4943061

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Cited by: 41 works
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