@article{f673e17dba784b94affb0a072b798d56,
title = "Observation of Interfacial Antiferromagnetic Coupling between Magnetic Topological Insulator and Antiferromagnetic Insulator",
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}",
note = "Funding Information: The authors would like to thank B. H. Yan, B. J. Dong, and X. D. Xu for the helpful discussions. F.W., Y.Z., and C.Z.C. acknowledge the support from ARO Young Investigator Program Award (W911NF1810198) and the Alfred P. Sloan Research Fellowship. D.X. and N.S. acknowledge the support from the Penn State Two-Dimensional Crystal Consortium-Materials Innovation Platform (2DCC-MIP) under NSF Grant DMR-1539916 and the Office of Naval Research (N00014-15-1-2370). C.X.L. acknowledges the support from the Office of Naval Research (N00014-15-1-2675). F.W., W.L., and Z.D.Z. acknowledge the support from the State Key Program of Research and Development of China (2017YFA0206302), the National Natural Science Foundation of China (NSFC) (51590883, 51331006, and 51771198) and the Key Research Program of Chinese Academy of Sciences (KJZD-EW-M05-3). J.S. acknowledges the support from DOE Grant (DE-FG02-07ER46351). W.H. acknowledges the support from the National Basic Research Programs of China (2015CB921104) and the National Natural Science Foundation of China (NSFC) (11574006). Support for the electrical transport measurements and data analysis is provided by the DOE Grant (DESC0019064). Funding Information: The authors would like to thank B. H. Yan, B. J. Dong, and X. D. Xu for the helpful discussions. F.W., Y.Z., and C.Z.C.acknowledge the support from ARO Young Investigator Program Award (W911NF1810198) and the Alfred P. Sloan Research Fellowship. D.X. and N.S. acknowledge the support from the Penn State Two-Dimensional Crystal Consortium-Materials Innovation Platform (2DCC-MIP) under NSF Grant DMR-1539916 and the Office of Naval Research (N00014-15-1-2370). C.X.L. acknowledges the support from the Office of Naval Research (N00014-15-1-2675). F.W., W.L., and Z.D.Z. acknowledge the support from the State Key Program of Research and Development of China (2017YFA0206302) the National Natural Science Foundation of China (NSFC) (51590883 51331006, and 51771198) and the Key Research Program of Chinese Academy of Sciences (KJZD-EW-M05-3). J.S. acknowledges the support from DOE Grant (DE-FG02-07ER46351). W.H. acknowledges the support from the National Basic Research Programs of China (2015CB921104) and the National Natural Science Foundation of China (NSFC) (11574006). Support for the electrical transport measurements and data analysis is provided by the DOE Grant (DE-SC0019064). Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",
year = "2019",
month = may,
day = "8",
doi = "10.1021/acs.nanolett.9b00027",
language = "English (US)",
volume = "19",
pages = "2945--2952",
journal = "Nano letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "5",
}