Anomalous depinning of magnetic domain walls within the ferromagnetic phase of the Weyl semimetal Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub>
Zihao Shen, X. D. Zhu, R. R. Ullah, P. Klavins, Valentin Taufour
Abstract
We report bulk magnetization measurements and spatially resolved measurements of magnetic domains inCo3Sn2S2single crystals. The results indicate that a previously reported magnetic anomaly around 130 K is due to an anomalous domain wall depinning upon cooling. Our measurements also reveal a hysteresis between field-cooled-cooling and field-cooled-warming magnetization curves acquired under a constant magnetic field below 300 Oe. This observation rules out the possibility that the anomaly stems from a second-order phase transition. Our results further suggest that changes in the shape of hysteresis loops from 5 to 170 K are caused by an unusual temperature-dependent domain nucleation field that changes sign around 130 K. The Kerr rotation images of the magnetic domains confirm that the domain walls depin between 120 and 140 K.