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

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Markou,  Anastasios
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kriegner,  Dominik
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Gayles,  Jacob
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zhang,  Liguo
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Chen,  Yi-Cheng
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ernst,  Benedikt
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schnelle,  Walter
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sun,  Yan
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Markou, A., Kriegner, D., Gayles, J., Zhang, L., Chen, Y.-C., Ernst, B., et al. (2019). Thickness dependence of the anomalous Hall effect in thin films of the topological semimetal Co2MnGa. Physical Review B, 100(5): 054422, pp. 1-7. doi:10.1103/PhysRevB.100.054422.


Cite as: http://hdl.handle.net/21.11116/0000-0004-A771-0
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 L2(1)-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.