title: Transition from Anomalous Hall Effect to Topological Hall Effect in Hexagonal Non-Collinear Magnet Mn3Ga.
abstract: We report experimental observation of large anomalous Hall effect exhibited in non-collinear triangular antiferromagnet D019-type Mn3Ga with coplanar spin structure at temperatures higher than 100 K. The value of anomalous Hall resistivity increases with increasing temperature, which reaches 1.25 μΩ · cm at a low field of ~300 Oe at room temperature. The corresponding room-temperature anomalous Hall conductivity is about 17 (Ω · cm)-1. Most interestingly, as temperature falls below 100 K, a temperature-independent topological-like Hall effect was observed. The maximum peak value of topological Hall resistivity is about 0.255 μΩ · cm. The appearance of the topological Hall effect is attributed to the change of spin texture as a result of weak structural distortion from hexagonal to orthorhombic symmetry in Mn3Ga. Present study suggests that Mn3Ga shows promising possibility to be antiferromagnetic spintronics or topological Hall effect-based data storage devices.
authors.affiliation: Department of Physics, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China. zhliu@ustb.edu.cn.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Liu
authors.affiliation: Department of Physics, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Zhang
authors.affiliation: School of Material Science and Engineering, Hebei University of Technology, Tianjin, 300130, People's Republic of China.
authors.forename: G D
authors.initials: GD
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
authors.forename: B
authors.initials: B
authors.lastname: Ding
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China. ekliu@iphy.ac.cn.
authors.forename: E K
authors.identifier: http://orcid.org/0000-0002-5498-993X
authors.initials: EK
authors.lastname: Liu
authors.affiliation: Department of Physics, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
authors.forename: Hasnain Mehdi
authors.initials: HM
authors.lastname: Jafri
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
authors.forename: Z P
authors.initials: ZP
authors.lastname: Hou
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
authors.forename: W H
authors.initials: WH
authors.lastname: Wang
authors.affiliation: Department of Physics, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
authors.forename: X Q
authors.identifier: http://orcid.org/0000-0001-9718-1538
authors.initials: XQ
authors.lastname: Ma
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
authors.forename: G H
authors.initials: GH
authors.lastname: Wu