Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.037201
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Funding
- Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, U.S. Department of Energy [DE-SC0018153]
- ONR [N00014-16-1-2951]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- U.S. Department of Energy (DOE) [DE-SC0018153] Funding Source: U.S. Department of Energy (DOE)
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Here, we present microscopic evidence of the persistence of uniaxial A-type antiferromagnetic order to the surface layers of MnBi2Te4 single crystals using magnetic force microscopy. Our results reveal termination-dependent magnetic contrast across both surface step edges and domain walls, which can be screened by thin layers of soft magnetism. The robust surface A-type order is further corroborated by the observation of termination-dependent surface spin-flop transitions, which have been theoretically proposed decades ago. Our results not only provide key ingredients for understanding the electronic properties of the antiferromagnetic topological insulator MnBi2Te4, but also open a new paradigm for exploring intrinsic surface metamagnetic transitions in natural antiferromagnets.
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