Imaging the motion of individual domain walls in the magnetic Weyl semimetal Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub>

ORAL

Abstract

The recently discovered magnetic Weyl semimetal Co3Sn2S2 is a uniaxial ferromagnet with a large c-axis anisotropy and a Tc of 175 K. Previous measurements of the temperature dependence of magnetization and ac susceptibility have revealed anomalous changes in slope near 130 K. Here we use scanning magneto-optic Kerr microscopy to measure the motion of individual domain walls in response to oscillating magnetic fields in the frequency range from 10 Hz to 10 kHz. As the temperature reaches 130 K from below, the amplitude of domain wall motion abruptly decreases by an order of magnitude, indicating that the effective magnetic torque exerted on the wall is significantly reduced. As the temperature is further increased toward the Curie temperature, the magnitude of wall motion becomes larger again and the magnetic domains shrink in size. We comment on how various scenarios of magnetic ordering can generate striking anomalies in the amplitude of domain wall motion vs. temperature.

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Presenters

  • Changmin Lee

    • Lawrence Berkeley National Laboratory
    • Massachusetts Institute of Technology MIT

Authors

  • Changmin Lee

    • Lawrence Berkeley National Laboratory
    • Massachusetts Institute of Technology MIT

  • Praveen Vir

    • Max Planck Institute for Chemical Physics of Solids

  • Kaustuv Manna

    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids,

  • Ella Lachman

    • University of California at Berkeley
    • University of California, Berkeley
    • Physics, University of California, Berkeley

  • Chandra Shekhar

    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for the Chemical Physics of Solids
    • Max Planck, Dresden
    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden

  • James Analytis

    • University of California, Berkeley
    • University of California at Berkeley
    • Physics, University of California, Berkeley

  • Claudia Felser

    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for the Chemical Physics of Solids
    • Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute, Dresden, Germany
    • Max Planck, Dresden
    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden
    • Max Planck Institute for Chemical Physics of Solids,

  • Joseph Orenstein

    • University of California at Berkeley
    • University of California, Berkeley
    • UC Berkeley and Lawrence Berkeley National Lab