title: Tailoring exchange couplings in magnetic topological-insulator/antiferromagnet heterostructures.
abstract: Magnetic topological insulators such as Cr-doped (Bi,Sb)2Te3provide a platform for the realization of versatile time-reversal symmetry-breaking physics. By constructing heterostructures exhibiting Néel order in an antiferromagnetic CrSb and ferromagnetic order in Cr-doped (Bi,Sb)2Te3, we realize emergent interfacial magnetic phenomena which can be tailored through artificial structural engineering. Through deliberate geometrical design of heterostructures and superlattices, we demonstrate the use of antiferromagnetic exchange coupling in manipulating the magnetic properties of magnetic topological insulators. Proximity effects are shown to induce an interfacial spin texture modulation and establish an effective long-range exchange coupling mediated by antiferromagnetism, which significantly enhances the magnetic ordering temperature in the superlattice. This work provides a new framework on integrating topological insulators with antiferromagnetic materials and unveils new avenues towards dissipationless topological antiferromagnetic spintronics.
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Qing Lin
authors: QL
authors: He
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Xufeng
authors: X
authors: Kou
authors: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
authors: Alexander J
authors: AJ
authors: Grutter
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Gen
authors: G
authors: Yin
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Lei
authors: L
authors: Pan
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Xiaoyu
authors: X
authors: Che
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Yuxiang
authors: Y
authors: Liu
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Tianxiao
authors: T
authors: Nie
authors: Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, 100124 Beijing, China.
authors: Bin
authors: B
authors: Zhang
authors: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
authors: Steven M
authors: SM
authors: Disseler
authors: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
authors: Brian J
authors: BJ
authors: Kirby
authors: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
authors: William
authors: W
authors: Ratcliff Ii
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Qiming
authors: 0000-0003-2613-3031
authors: Q
authors: Shao
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Koichi
authors: K
authors: Murata
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Xiaodan
authors: X
authors: Zhu
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Guoqiang
authors: G
authors: Yu
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Yabin
authors: Y
authors: Fan
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Mohammad
authors: M
authors: Montazeri
authors: Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, 100124 Beijing, China.
authors: Xiaodong
authors: X
authors: Han
authors: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
authors: Julie A
authors: JA
authors: Borchers
authors: Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
authors: Kang L
authors: 0000-0002-9363-1279
authors: KL
authors: Wang