Observation of Giant Topological Hall Effect in Room-Temperature Ferromagnet Cr 0.82 Te

• Published in: Chinese physics letters 2024-06, Vol.41 (6), p.67501
• Main Authors: Miao 苗, Wei-Ting 伟婷, Zhen 甄, Wei-Li 伟立, Lu 陆, Zhen 振, Wang 王, Heng-Ning 恒宁, Wang 王, Jie 杰, Niu 牛, Qun 群, Tian 田, Ming-Liang 明亮
• Format: Article
• Language: English
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/41/6/067501

Novel magnetic materials with non-trivial magnetic structures have led to exotic magnetic transport properties and significantly promoted the development of spintronics in recent years. Among them is the Cr x Te y family, the magnetism of which can persist above room temperature, thus providing an ideal system for potential spintronic applications. Here we report the synthesis of a new compound, Cr 0.82 Te, which demonstrates a record-high topological Hall effect at room temperature in this family. Cr 0.82 Te displays soft ferromagnetism below the Curie temperature of 340 K. The magnetic measurement shows an obvious magneto-crystalline anisotropy with the easy axis located in the ab plane. The anomalous Hall effect can be well explained by a dominating skew scattering mechanism. Intriguing, after removing the normal Hall effect and anomalous Hall effect, a topological Hall effect can be observed up to 300 K and reaches up to 1.14 μΩ⋅cm at 10 K, which is superior to most topological magnetic structural materials. This giant topological Hall effect possibly originates from the noncoplanar spin configuration during the spin flop process. Our work extends a new Cr x Te y system with topological non-trivial magnetic structure and broad prospects for spintronics applications in the future.