Room-Temperature Angular-Dependent Topological Hall Effect In Chiral Antiferromagnetic Weyl Semimetal Mn3sn

Chiral antiferromagnetic (AFM) Weyl semimetal Mn3Sn shows a large anomalous Hall effect (AHE) around room temperature, due to the Berry curvature generated by Weyl nodes in electronic dispersions. Here, we study the temperature- and angular-dependent Hall effect and magnetic measurement in single-crystalline Mn3Sn. There are some intriguing phenomena: first, a large hysteretic-type AHE has been observed only above 270K, while the coercivity is around 300Oe and independent of temperature. Second, the temperature- and angular-dependent topological Hall effect is obtained, which may stem from the real space topological spin texture. Third, the coercivity extracted from the angular-dependent AHE is well fitted with the Stoner-Wohlfarth model, which reflects the evolution of domain walls and magnetic anisotropy. Thus, it shows that not only the topological structure in momentum space but also the real space topological spin texture plays an important role in anomalous transport properties of Mn3Sn. Our work pushes forward to the realization of room temperature AFM spintronics and paves the way toward the possible devices based on the unconventional Hall effect.