We report bulk magnetization measurements and spatially resolved measurements of magnetic domains in Co3Sn2S2 single crystals. The results indicate that a previously reported magnetic anomaly at 130 K is due to domain wall pinning. Our measurements also reveal a hysteresis between field-cooled-cooling (FCC) and field-cooled-warming (FCW) magnetization curves acquired under a constant magnetic field below 300 Oe. The observation rules out the possibility that the anomaly stems from a second-order AFM-FM phase transition. Our results further suggest that changes in the shape of hysteresis loops from 5 K to 170 K is caused by an unusual temperature-dependent domain nucleation field that changes the sign at around 130 K. The Kerr rotation images of the magnetic domains obtained between 120 K and 140 K support the notion that a domain wall pinning effect exists near 130 K.
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