Observation of Giant Topological Hall Effect in Room-Temperature Ferromagnet Cr_0.82Te

Abstract 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 CrxTey 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, Cr0.82Te, which demonstrates a record-high topological Hall effect at room temperature in this family. Cr0.82Te 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 reach up to 1.14 µΩ cm at 10 K, which is superior to most topological magnetic structural materials. This giant topological Hall effect likely originated from the noncoplanar spin configuration during the spin flop process. Our work extends a new CrxTey system with topological non-trivial magnetic structure and broad prospects for spintronics applications in the future.