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Title: Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi 2Te 4

Abstract

The control of domain walls or spin textures is crucial for spintronic applications of antiferromagnets. Despite many efforts, it has been challenging to directly visualize antiferromagnetic domains or domain walls with nanoscale resolution, especially in magnetic field. Here, we report magnetic imaging of domain walls in several uniaxial antiferromagnets, the topological insulator MnBi 2Te 4 family, using cryogenic magnetic force microscopy (MFM). Our MFM results reveal higher magnetic susceptibility inside the domain walls than in domains. Domain walls in these antiferromagnets form randomly with strong thermal and magnetic field dependence. Here, the direct visualization of these domain walls and domain structures in the magnetic field will not only facilitate the exploration of intrinsic topological phenomena in antiferromagnetic topological insulators but will also open a new path toward control and manipulation of domain walls or spin textures in functional antiferromagnets.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [3];  [3]; ORCiD logo [1]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. New Jersey Inst. of Technology, Newark, NJ (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1608193
Alternate Identifier(s):
OSTI ID: 1638232
Grant/Contract Number:  
AC05-00OR22725; SC0018153
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 20; Journal Issue: 4; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; domain walls; antiferromagnetic topological insulator; magnetic force microscopy; spin-flop transition; crystal structure; magnetic properties; energy; quantum mechanics; order; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Domain walls, Antiferromagnetic topological insulator, magnetic force microscopy, spin-flop transition

Citation Formats

Sass, Paul M., Ge, Wenbo, Yan, Jiaqiang, Obeysekera, D., Yang, J. J., and Wu, Weida. Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi2Te4. United States: N. p., 2020. Web. doi:10.1021/acs.nanolett.0c00114.
Sass, Paul M., Ge, Wenbo, Yan, Jiaqiang, Obeysekera, D., Yang, J. J., & Wu, Weida. Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi2Te4. United States. doi:10.1021/acs.nanolett.0c00114.
Sass, Paul M., Ge, Wenbo, Yan, Jiaqiang, Obeysekera, D., Yang, J. J., and Wu, Weida. Mon . "Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi2Te4". United States. doi:10.1021/acs.nanolett.0c00114.
@article{osti_1608193,
title = {Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi2Te4},
author = {Sass, Paul M. and Ge, Wenbo and Yan, Jiaqiang and Obeysekera, D. and Yang, J. J. and Wu, Weida},
abstractNote = {The control of domain walls or spin textures is crucial for spintronic applications of antiferromagnets. Despite many efforts, it has been challenging to directly visualize antiferromagnetic domains or domain walls with nanoscale resolution, especially in magnetic field. Here, we report magnetic imaging of domain walls in several uniaxial antiferromagnets, the topological insulator MnBi2Te4 family, using cryogenic magnetic force microscopy (MFM). Our MFM results reveal higher magnetic susceptibility inside the domain walls than in domains. Domain walls in these antiferromagnets form randomly with strong thermal and magnetic field dependence. Here, the direct visualization of these domain walls and domain structures in the magnetic field will not only facilitate the exploration of intrinsic topological phenomena in antiferromagnetic topological insulators but will also open a new path toward control and manipulation of domain walls or spin textures in functional antiferromagnets.},
doi = {10.1021/acs.nanolett.0c00114},
journal = {Nano Letters},
issn = {1530-6984},
number = 4,
volume = 20,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 2, 2021
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