Thickness dependence of the anomalous Hall effect in thin films of the topological semimetal Co2MnGa

Anastasios Markou, Dominik Kriegner, Jacob Gayles, Liguo Zhang, Yi-Cheng Chen, Benedikt Ernst, Yu-Hong Lai, Walter Schnelle, Ying-Hao Chu, Yan Sun, and Claudia Felser
Phys. Rev. B 100, 054422 – Published 19 August 2019

Abstract

Topological magnetic semimetals promise large Berry curvature through the distribution of the topological Weyl nodes or nodal lines and further novel physics with exotic transport phenomena. We present a systematic study of the structural and magnetotransport properties of Co2MnGa films from thin (20 nm) to bulklike behavior (80 nm) in order to understand the underlying mechanisms and the role of topology. The magnetron sputtered Co2MnGa films are L21-ordered showing very good heteroepitaxy and a strain-induced tetragonal distortion. The anomalous Hall conductivity was found to be maximum at a value of 1138 S/cm, with a corresponding anomalous Hall angle of 13%, which is comparatively larger than topologically trivial metals. There is good agreement between the theoretical calculations and the Hall conductivity observed for the 80 nm film, which suggests that the effect is intrinsic. Thus, the Co2MnGa compound manifests as a promising material for topologically driven spintronic applications.

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  • Received 26 April 2019

DOI:https://doi.org/10.1103/PhysRevB.100.054422

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Anastasios Markou1,*, Dominik Kriegner1, Jacob Gayles1, Liguo Zhang1, Yi-Cheng Chen1,2, Benedikt Ernst1, Yu-Hong Lai2, Walter Schnelle1, Ying-Hao Chu2, Yan Sun1, and Claudia Felser1

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
  • 2Department of Materials Science and Engineering, National Chiao Tung University, 30010 Hsinchu, Taiwan, Republic of China

  • *anastasios.markou@cpfs.mpg.de

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Vol. 100, Iss. 5 — 1 August 2019

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