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Concurrence of quantum anomalous Hall and topological Hall effects in magnetic topological insulator sandwich heterostructures

Journal Article · · Nature Materials
The quantum anomalous Hall (QAH) effect is a consequence of non-zero Berry curvature in momentum space. The QAH insulator harbours dissipation-free chiral edge states in the absence of an external magnetic field. Yet, the topological Hall (TH) effect, a hallmark of chiral spin textures, is a consequence of real-space Berry curvature. Herein, by inserting a topological insulator (TI) layer between two magnetic TI layers, we realized the concurrence of the TH effect and the QAH effect through electric-field gating. The TH effect is probed by bulk carriers, whereas the QAH effect is characterized by chiral edge states. The appearance of the TH effect in the QAH insulating regime is a consequence of chiral magnetic domain walls that result from the gate-induced Dzyaloshinskii–Moriya interaction and occurs during the magnetization reversal process in the magnetic TI sandwich samples. The coexistence of chiral edge states and chiral spin textures provides a platform for proof-of-concept dis- sipationless spin-textured spintronic applications.
Research Organization:
Pennsylvania State Univ., University Park, PA (United States); Univ. of New Hampshire, Durham, NH (United States)
Sponsoring Organization:
Gordon and Betty Moore Foundation; National Science Foundation (NSF); Office of Naval Research (ONR); US Army Research Office (ARO); USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0016424; SC0019064; SC0020221
OSTI ID:
1631267
Alternate ID(s):
OSTI ID: 1660957
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 7 Vol. 19; ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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