Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi2Te4

Sass, Paul M.; Ge, Wenbo; Yan, Jiaqiang; Obeysekera, D.; Yang, J. J.; Wu, Weida

doi:10.1021/acs.nanolett.0c00114

Title: Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi₂Te₄

Journal Article · Mon Mar 02 00:00:00 EST 2020 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.0c00114· OSTI ID:1608193

^[1]; Ge, Wenbo ^[1];

^[2]; Obeysekera, D. ^[3]; Yang, J. J. ^[3];

^[1]

Rutgers Univ., Piscataway, NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
New Jersey Inst. of Technology, Newark, NJ (United States)

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. 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Rutgers Univ., Piscataway, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725; SC0018153

OSTI ID:: 1608193

Alternate ID(s):: OSTI ID: 1638232

Journal Information:: Nano Letters, Vol. 20, Issue 4; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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Title: Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi2Te4

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Title: Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi₂Te₄