Magnetic field and temperature driven evolution of the domain structure in the magnetic Weyl semimetal Co₃Sn₂S₂

Anomalous Hall effect, bow-tie like magnetization loops, strong exchange bias and other intriguing magnetic and magneto-transport properties of Co₃Sn₂S₂ do not yet have a complete explanation. We address these properties through real time imaging of the domain structure (DS) of several Co₃Sn₂S₂ crystals in magnetic fields of various orientations at temperatures from 4K to the Curie temperature. Together with the macroscopic hysteresis loop and magnetization M(T, H) measurements, changes of the DS with application of magnetic fields perpendicular and parallel to the basal plane, and during field cooling and field warming experiments clearly reveal peculiarities in the DS nucleation and further evolution corresponding to the M(T, H) changes. They allow us to associate the anomalous electromagnetic response of Co₃Sn₂S₂ with field and temperature dependent nucleation and further transformation of the DS affected by the extremely high uniaxial anisotropy and possible geometric frustration in the Kagome lattice spin structure.