Anomalous depinning of magnetic domain walls within the ferromagnetic phase of the Weyl semimetal Co3Sn2S2. (1st February 2023)

• Record Type: Journal Article
• Authors: Shen, Zihao; Zhu, X D; Ullah, Rahim R; Klavins, Peter; Taufour, Valentin
• Is Part Of: Journal of physics. Volume 35:Number 4(2023)
• Publication Date: 2023-02-01
• Subjects: magnetization -- domain wall depinning -- Kerr images -- Weyl semimetal; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aca57b
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We report bulk magnetization measurements and spatially resolved measurements of magnetic domains in C o 3 S n 2 S 2 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 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.