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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2021
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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) |
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Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 |
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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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