Observation of Interfacial Antiferromagnetic Coupling between Magnetic Topological Insulator and Antiferromagnetic Insulator

Fei Wang, Di Xiao, Wei Yuan, Jue Jiang, Yi Fan Zhao, Ling Zhang, Yunyan Yao, Wei Liu, Zhidong Zhang, Chaoxing Liu, Jing Shi, Wei Han, Moses H.W. Chan, Nitin Samarth, Cui Zu Chang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Inducing magnetic orders in a topological insulator (TI) to break its time reversal symmetry has been predicted to reveal many exotic topological quantum phenomena. The manipulation of magnetic orders in a TI layer can play a key role in harnessing these quantum phenomena toward technological applications. Here we fabricated a thin magnetic TI film on an antiferromagnetic (AFM) insulator Cr 2 O 3 layer and found that the magnetic moments of the magnetic TI layer and the surface spins of the Cr 2 O 3 layers favor interfacial AFM coupling. Field cooling studies show a crossover from negative to positive exchange bias clarifying the competition between the interfacial AFM coupling energy and the Zeeman energy in the AFM insulator layer. The interfacial exchange coupling also enhances the Curie temperature of the magnetic TI layer. The unique interfacial AFM alignment in magnetic TI on AFM insulator heterostructures opens a new route toward manipulating the interplay between topological states and magnetic orders in spin-engineered heterostructures, facilitating the exploration of proof-of-concept TI-based spintronic and electronic devices with multifunctionality and low power consumption.

Original languageEnglish (US)
Pages (from-to)2945-2952
Number of pages8
JournalNano letters
Volume19
Issue number5
DOIs
StatePublished - May 8 2019

Fingerprint

Magnetic couplings
Heterojunctions
insulators
Magnetoelectronics
Exchange coupling
Curie temperature
Magnetic moments
Electric power utilization
Cooling
manipulators
crossovers
magnetic moments
alignment
routes
cooling

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Wang, Fei ; Xiao, Di ; Yuan, Wei ; Jiang, Jue ; Zhao, Yi Fan ; Zhang, Ling ; Yao, Yunyan ; Liu, Wei ; Zhang, Zhidong ; Liu, Chaoxing ; Shi, Jing ; Han, Wei ; Chan, Moses H.W. ; Samarth, Nitin ; Chang, Cui Zu. / Observation of Interfacial Antiferromagnetic Coupling between Magnetic Topological Insulator and Antiferromagnetic Insulator. In: Nano letters. 2019 ; Vol. 19, No. 5. pp. 2945-2952.
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abstract = "Inducing magnetic orders in a topological insulator (TI) to break its time reversal symmetry has been predicted to reveal many exotic topological quantum phenomena. The manipulation of magnetic orders in a TI layer can play a key role in harnessing these quantum phenomena toward technological applications. Here we fabricated a thin magnetic TI film on an antiferromagnetic (AFM) insulator Cr 2 O 3 layer and found that the magnetic moments of the magnetic TI layer and the surface spins of the Cr 2 O 3 layers favor interfacial AFM coupling. Field cooling studies show a crossover from negative to positive exchange bias clarifying the competition between the interfacial AFM coupling energy and the Zeeman energy in the AFM insulator layer. The interfacial exchange coupling also enhances the Curie temperature of the magnetic TI layer. The unique interfacial AFM alignment in magnetic TI on AFM insulator heterostructures opens a new route toward manipulating the interplay between topological states and magnetic orders in spin-engineered heterostructures, facilitating the exploration of proof-of-concept TI-based spintronic and electronic devices with multifunctionality and low power consumption.",
author = "Fei Wang and Di Xiao and Wei Yuan and Jue Jiang and Zhao, {Yi Fan} and Ling Zhang and Yunyan Yao and Wei Liu and Zhidong Zhang and Chaoxing Liu and Jing Shi and Wei Han and Chan, {Moses H.W.} and Nitin Samarth and Chang, {Cui Zu}",
year = "2019",
month = "5",
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doi = "10.1021/acs.nanolett.9b00027",
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Wang, F, Xiao, D, Yuan, W, Jiang, J, Zhao, YF, Zhang, L, Yao, Y, Liu, W, Zhang, Z, Liu, C, Shi, J, Han, W, Chan, MHW, Samarth, N & Chang, CZ 2019, 'Observation of Interfacial Antiferromagnetic Coupling between Magnetic Topological Insulator and Antiferromagnetic Insulator', Nano letters, vol. 19, no. 5, pp. 2945-2952. https://doi.org/10.1021/acs.nanolett.9b00027

Observation of Interfacial Antiferromagnetic Coupling between Magnetic Topological Insulator and Antiferromagnetic Insulator. / Wang, Fei; Xiao, Di; Yuan, Wei; Jiang, Jue; Zhao, Yi Fan; Zhang, Ling; Yao, Yunyan; Liu, Wei; Zhang, Zhidong; Liu, Chaoxing; Shi, Jing; Han, Wei; Chan, Moses H.W.; Samarth, Nitin; Chang, Cui Zu.

In: Nano letters, Vol. 19, No. 5, 08.05.2019, p. 2945-2952.

Research output: Contribution to journalArticle

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AU - Wang, Fei

AU - Xiao, Di

AU - Yuan, Wei

AU - Jiang, Jue

AU - Zhao, Yi Fan

AU - Zhang, Ling

AU - Yao, Yunyan

AU - Liu, Wei

AU - Zhang, Zhidong

AU - Liu, Chaoxing

AU - Shi, Jing

AU - Han, Wei

AU - Chan, Moses H.W.

AU - Samarth, Nitin

AU - Chang, Cui Zu

PY - 2019/5/8

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N2 - Inducing magnetic orders in a topological insulator (TI) to break its time reversal symmetry has been predicted to reveal many exotic topological quantum phenomena. The manipulation of magnetic orders in a TI layer can play a key role in harnessing these quantum phenomena toward technological applications. Here we fabricated a thin magnetic TI film on an antiferromagnetic (AFM) insulator Cr 2 O 3 layer and found that the magnetic moments of the magnetic TI layer and the surface spins of the Cr 2 O 3 layers favor interfacial AFM coupling. Field cooling studies show a crossover from negative to positive exchange bias clarifying the competition between the interfacial AFM coupling energy and the Zeeman energy in the AFM insulator layer. The interfacial exchange coupling also enhances the Curie temperature of the magnetic TI layer. The unique interfacial AFM alignment in magnetic TI on AFM insulator heterostructures opens a new route toward manipulating the interplay between topological states and magnetic orders in spin-engineered heterostructures, facilitating the exploration of proof-of-concept TI-based spintronic and electronic devices with multifunctionality and low power consumption.

AB - Inducing magnetic orders in a topological insulator (TI) to break its time reversal symmetry has been predicted to reveal many exotic topological quantum phenomena. The manipulation of magnetic orders in a TI layer can play a key role in harnessing these quantum phenomena toward technological applications. Here we fabricated a thin magnetic TI film on an antiferromagnetic (AFM) insulator Cr 2 O 3 layer and found that the magnetic moments of the magnetic TI layer and the surface spins of the Cr 2 O 3 layers favor interfacial AFM coupling. Field cooling studies show a crossover from negative to positive exchange bias clarifying the competition between the interfacial AFM coupling energy and the Zeeman energy in the AFM insulator layer. The interfacial exchange coupling also enhances the Curie temperature of the magnetic TI layer. The unique interfacial AFM alignment in magnetic TI on AFM insulator heterostructures opens a new route toward manipulating the interplay between topological states and magnetic orders in spin-engineered heterostructures, facilitating the exploration of proof-of-concept TI-based spintronic and electronic devices with multifunctionality and low power consumption.

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