Berry curvature origin of the thickness-dependent anomalous Hall effect in a ferromagnetic Weyl semimetal

Abstract Magnetic Weyl semimetals with spontaneously broken time-reversal symmetry exhibit a large intrinsic anomalous Hall effect originating from the Berry curvature. To employ this large Hall current for room temperature topo-spintronics applications, it is necessary to fabricate these materials...

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Autores principales: Yao Zhang, Yuefeng Yin, Guy Dubuis, Tane Butler, Nikhil V. Medhekar, Simon Granville
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Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/dbe70f2f57a74a90806dadaf44358b56
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spelling oai:doaj.org-article:dbe70f2f57a74a90806dadaf44358b562021-12-02T13:50:55ZBerry curvature origin of the thickness-dependent anomalous Hall effect in a ferromagnetic Weyl semimetal10.1038/s41535-021-00315-82397-4648https://doaj.org/article/dbe70f2f57a74a90806dadaf44358b562021-02-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00315-8https://doaj.org/toc/2397-4648Abstract Magnetic Weyl semimetals with spontaneously broken time-reversal symmetry exhibit a large intrinsic anomalous Hall effect originating from the Berry curvature. To employ this large Hall current for room temperature topo-spintronics applications, it is necessary to fabricate these materials as thin or ultrathin films. Here, we experimentally demonstrate that Weyl semimetal Co2MnGa thin films (20–50 nm) show a large anomalous Hall angle ~11.4% at low temperature and ~9.7% at room temperature, which can be ascribed to the non-trivial topology of the band structure with large intrinsic Berry curvature. However, the anomalous Hall angle decreases significantly with thicknesses below 20 nm, which band structure calculations confirm is due to the reduction of the majority spin contribution to the Berry curvature. Our results suggest that Co2MnGa is an excellent material to realize room temperature topo-spintronics applications; however, the significant thickness dependence of the Berry curvature has important implications for thin-film device design.Yao ZhangYuefeng YinGuy DubuisTane ButlerNikhil V. MedhekarSimon GranvilleNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-8 (2021)
institution DOAJ
collection DOAJ
language EN
topic Materials of engineering and construction. Mechanics of materials
TA401-492
Atomic physics. Constitution and properties of matter
QC170-197
spellingShingle Materials of engineering and construction. Mechanics of materials
TA401-492
Atomic physics. Constitution and properties of matter
QC170-197
Yao Zhang
Yuefeng Yin
Guy Dubuis
Tane Butler
Nikhil V. Medhekar
Simon Granville
Berry curvature origin of the thickness-dependent anomalous Hall effect in a ferromagnetic Weyl semimetal
description Abstract Magnetic Weyl semimetals with spontaneously broken time-reversal symmetry exhibit a large intrinsic anomalous Hall effect originating from the Berry curvature. To employ this large Hall current for room temperature topo-spintronics applications, it is necessary to fabricate these materials as thin or ultrathin films. Here, we experimentally demonstrate that Weyl semimetal Co2MnGa thin films (20–50 nm) show a large anomalous Hall angle ~11.4% at low temperature and ~9.7% at room temperature, which can be ascribed to the non-trivial topology of the band structure with large intrinsic Berry curvature. However, the anomalous Hall angle decreases significantly with thicknesses below 20 nm, which band structure calculations confirm is due to the reduction of the majority spin contribution to the Berry curvature. Our results suggest that Co2MnGa is an excellent material to realize room temperature topo-spintronics applications; however, the significant thickness dependence of the Berry curvature has important implications for thin-film device design.
format article
author Yao Zhang
Yuefeng Yin
Guy Dubuis
Tane Butler
Nikhil V. Medhekar
Simon Granville
author_facet Yao Zhang
Yuefeng Yin
Guy Dubuis
Tane Butler
Nikhil V. Medhekar
Simon Granville
author_sort Yao Zhang
title Berry curvature origin of the thickness-dependent anomalous Hall effect in a ferromagnetic Weyl semimetal
title_short Berry curvature origin of the thickness-dependent anomalous Hall effect in a ferromagnetic Weyl semimetal
title_full Berry curvature origin of the thickness-dependent anomalous Hall effect in a ferromagnetic Weyl semimetal
title_fullStr Berry curvature origin of the thickness-dependent anomalous Hall effect in a ferromagnetic Weyl semimetal
title_full_unstemmed Berry curvature origin of the thickness-dependent anomalous Hall effect in a ferromagnetic Weyl semimetal
title_sort berry curvature origin of the thickness-dependent anomalous hall effect in a ferromagnetic weyl semimetal
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/dbe70f2f57a74a90806dadaf44358b56
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