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Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBi$_2$Te$_4$ | | Paul M. Sass
; Jinwoong Kim
; David Vanderbilt
; Jiaqiang Yan
; Weida Wu
; | | Date: |
13 Jun 2020 | | Abstract: | Here we present microscopic evidence of the persistence of uniaxial A-type
antiferromagnetic order to the surface layers of MnBi$_2$Te$_4$ 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 MnBi$_2$Te$_4$, but
also open a new paradigm for exploring intrinsic surface metamagnetic
transitions in natural antiferromagnets. | | Source: | arXiv, 2006.7656 | | Services: | Forum | Review | PDF | Favorites | |
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