2018 Fiscal Year Final Research Report
Fabrication of Weyl semimetals based spintronic heterostructures for future energy-efficient IT devices
| Project/Area Number |
17K14652
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | National Institute for Materials Science (2018)
Tohoku University (2017) |
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Principal Investigator |
Wen Zhenchao 国立研究開発法人物質・材料研究機構, 磁性・スピントロニクス材料研究拠点, 主任研究員 (40784773)
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Keywords | Weyl semimetals / Spintronic structures / Spin-orbit effects |
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| Outline of Final Research Achievements |
In this research, the Weyl semimetal films of WTe2 and MoTe2 were fabricated by sputtering for the first time. By combining with CoFeB/AlOx, spin Hall magnetoresistance was investigated. A sizeable spin Hall effect was achieved in the sputtered WTe2 Weyl semimetal based spintronic structures. Furthermore, Co2MnGa Weyl semimetal thin films were fabricated by sputtering method and the spin-orbit effects in the films were studied. A large anomalous Hall angle of ~14% was achieved. It is also observed that the anomalous Hall effect strongly depends on the degree of order of the Co2MnGa Weyl semimetals. The samples containing L21-ordered phase show enhanced anomalous Hall effect compared to B2-ordered samples. The reason could be the different electronic structures between the two ordered phases. The experimental demonstration of the spin orbit effects in sputtered Weyl semimetals could contribute the progress of the development of topological spintronic devices.
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| Free Research Field |
磁性・スピントロニクス材料
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| Academic Significance and Societal Importance of the Research Achievements |
The experimental demonstration of the spin-orbit effects in Weyl semimetals in this research can contribute the progress of the developments of topological spintronic devices, which could provide an essential way of achieving energy-efficient IT devices for realizing the super-smart society.
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