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Topological Hall Effect in Topological Insulator/Magnetic Insulator Bilayer

What Has Been Achieved:
The experiment provides evidence for a topological Hall effect created by skyrmions and  the Dzyaloshinskii–Moriya interaction at the interface between a topological insulator (Bi2Se3) and an insulating ferromagnet (BaFe12O19).

Importance of the Achievement:
This study identified a model system wherein the topological Hall effect and skyrmions, phenomena of fundamental interest in condensed matter physics, can be systematically studied in an interfacial topological quantum material with no obvious artifacts. 

Unique Feature(s) of the MIP that Enabled this Achievement:
This project relied on 2DCC-MIP’s development of well-controlled MBE growth of good quality, wafer-scale epitaxial Bi2Se3 thin films on a ferromagnetic insulator.  

Publication: Peng Li, Jinjun Ding, Steven S.-L. Zhang, James Kally, Timothy Pillsbury, Olle G. Heinonen, Gaurab Rimal, Chong Bi, August DeMann, Stuart B. Field, Weigang Wang, Jinke Tang, Jidong Samuel Jiang, Axel Hoffmann, Nitin Samarth, and Mingzhong Wu*

, Nano Lett. 21, 1, 84–90 (2021). DOI: 10.1021/acs.nanolett.0c03195

 

This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (DE-SC0018994). The fabrication and characterization of the samples were supported by the U.S. National Science Foundation (EFMA-1641989; ECCS-1915849). Instrumentation supported by the National Science Foundation MRI program (DMR-1727044) was used for this work. Work at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering. Work at CWRU was supported by the College of Arts and Sciences at CWRU. Work at PSU was supported by the Penn State Two-Dimensional Crystal Consortium-Materials Innovation Platform (2DCC-MIP) under the U.S. National Science Foundation Grant DMR-1539916. Work at UW was supported by the U.S. National Science Foundation (DMR-1710512) and the U.S. Department of Energy, Office of Science, Basic Energy Sciences (DE-SC0020074). Work at UA is supported by the U.S. National Science Foundation (ECCS- 1554011).

Credits/Names: 
Peng Li, Jinjun Ding, Mingzhong Wu (Colorado State); Olle Heinonen, Jidong Jiang, Axel Hoffmann (Argonne); Tim Pillsbury, James Kally, Nitin Samarth (2DCC, Penn State)
Year of Research Highlight: 
2021
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