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Tailoring Exchange Couplings in Magnetic Topological Insulator/Antiferromagnet Heterostructures

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arxiv 1605.04854 v1 pith:6BZD7B3B submitted 2016-05-16 cond-mat.mtrl-sci

Qing Lin He , Xufeng Kou , Alexander J. Grutter , Lei Pan , Xiaoyu Che , Yuxiang Liu , Tianxiao Nie , Steven M. Disseler
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Brian J. Kirby William Ratcliff II Qiming Shao Koichi Murata Yabin Fan Mohammad Montazeri Julie A. Borchers Kang L. Wang
This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords topologicalmagneticantiferromagneticheterostructurescr-dopedexchangeinsulatorsorder
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Magnetic topological insulators such as Cr-doped (Bi,Sb)2Te3 provide a platform for the realization of versatile time-reversal symmetry-breaking physics. By constructing heterostructures with N\'eel order in an antiferromagnetic CrSb and magnetic topological 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 the topological surface massive Dirac fermions. This work provides a new framework on integrating topological insulators with antiferromagnetic materials and unveils new avenues towards dissipationless topological antiferromagnetic spintronics.

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