Observation of Magnetic Bubble Domains in the Quasi-2D Kagomé Ferromagnetic Weyl Semimetal Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub><sup>1</sup>

ORAL

Abstract

The Co-based shandite, Co3Sn2S2, is a Weyl3 semi-metal hosting an itinerant ferromagnetic quasi-2D Kagomé lattice of Co ions. This system exhibits strong c-axis anisotropy with a curie temperature ~ 174 K and a spontaneous moment of ~ 0.3 μB/Co.2 Low-field magnetization and AC susceptibility measurements have revealed an anomalous magnetic phase above ~ 126 K and below ~ 40 mT, indicating a possible skyrmion phase. To this end, we carried out variable-temperature magnetic force microscopy studies on Co3Sn2S2 single crystals. MFM images under zero-field cooling revealed fingerprint-like magnetic domains, while low-field cooling through TC resulted in seemingly periodic magnetic bubble domains, which is consistent with the quasi-2D nature of the magnetic ordering. Detailed temperature and cooling field dependence of the magnetic domain patterns will be presented.

2M. A. Kassem, et al., J. Phys. Soc. Jpn. 85, 064706 (2016).
3Q. Wang, et al., Nat. Comm. 9, 3681 (2018).

*1This work is supported by DOE BES under award DE-SC0018153.

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Presenters

  • Paul Sass

    • Rutgers University, New Brunswick

Authors

  • Paul Sass

    • Rutgers University, New Brunswick

  • Weida Wu

    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
    • Department of Physics and Astronomy, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick
    • Rutgers University, New Brunswick

  • Linda Ye

    • Massachusetts Institute of Technology
    • Department of Physics, Massachusetts Institute of Technology

  • Joseph Checkelsky

    • MIT
    • Massachusetts Institute of Technology
    • Physics, Massachusetts Institute of Technology
    • Department of Physics, Massachusetts Institute of Technology