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Visualization of Antiferromagnetic Domain Walls in the Topological Semimetal EuMnBi<sub>2</sub>

ORAL

Abstract

The layered compound EuMnBi2 is one such system where magnetic order coexists with Dirac fermions. The interplay between the uniaxial A-type antiferromagnetic (AFM) Eu magnetic order and quasi-2D Dirac fermions was recently observed to give rise to a multilayer quantum Hall state at high magnetic field above the spin-flop transition (> 5 T)1. In this talk we will present magnetic imaging of AFM domain walls (DW) and their evolution across the spin-flop transition in the topological semimetal EuMnBi2 using our cryogenic magnetic force microscope2. Our results reveal that curvilinear AFM DWs naturally form when the sample is cooled below TN (~ 22 K). Magnetic field dependence of the DW signal suggests enhanced susceptibility inside the DWs in the A-type AFM state. The DWs disappear above the spin-flop transition, and re-nucleate at different locations after reentry into the A-type AFM state. The direct visualization of AFM DWs in topological semimetals will help in the understanding of topological phenomena in correlated magnetic systems.

1. Masuda, H. et al. Sci. Adv. 2, 1–7 (2016).
2. Sass, P. M. et al. arXiv:1910.06488 (2019).

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Presenters

  • Wenbo Ge

    Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick

Authors

  • Wenbo Ge

    Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick

  • Paul Sass

    Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick

  • Weida Wu

    Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Department of Physics and Astronomy, Rutgers University, New Brunswick, Rutgers University, New Brunswick

  • Dimuthu Obeysekera

    Physics, Central Michigan University, Department of Physics, New Jersey Institute of Technology, Central Michigan University

  • Junjie Yang

    Physics, New Jersey Institute of Technology, Department of Physics, New Jersey Institute of Technology, New Jersey Institute of Technology, Physics, Central Michigan University, Central Michigan University