Anomalous depinning of magnetic domain walls within the ferromagnetic phase of the Weyl semimetal Co3Sn2S2

Abstract

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 around 130 K is due to an anomalous domain wall depinning upon cooling. 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. 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 K 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 K and 140 K.

8 pages, 7 figures

References in corpus (5)

• On the anisotropies of magnetization and electronic transport of magnetic Weyl semimetal Co3Sn2S2
• Unusual exchange couplings and intermediate temperature Weyl state in Co3Sn2S2
• The magnetic structure of the topological semimetal Co${}_3$Sn${}_2$S${}_2$
• Hidden spin-texture at topological domain walls drive exchange bias in a Weyl semimetal
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• Tunable Anomalous Hall Effect in a Kagome Ferromagnetic Weyl Semimetal
• Mesoscale variations of chemical and electronic landscape on the surface of Weyl semimetal Co${}_3$Sn${}_2$S${}_2$ visualized by ARPES and XPS
• In-plane Antiferromagnetism in Ferromagnetic Kagome Semimetal Co3Sn2S2