| Project/Area Number |
22K18967
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 29:Applied condensed matter physics and related fields
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Uchida Masaki 東京工業大学, 理学院, 准教授 (50721726)
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| Project Period (FY) |
2022-06-30 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2022: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | 磁性半導体 / 薄膜 |
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| Outline of Research at the Start |
実空間におけるトポロジカルな磁気秩序構造と、その非共面スピン構造のスピンカイラ リティが寄与する異常ホール効果の研究は、ますます盛んになっている。本研究では、トポロジカルな磁気秩序構造と結びつく半導体中のキャリア輸送に着目し、巨大な異常ホール応答を実現するトポロジカル磁性半導体の分野を新たに開拓する。
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| Outline of Final Research Achievements |
In this study, we focus on carrier transport in semiconductors coupled to topological magnetic orderings, and aim to develop topological magnetic semiconductors that realize giant anomalous Hall responses. In particular, we have systematically fabricated thin films of Eu1-xGdxAs, in which Eu is substituted for Gd in the triangular lattice magnetic semiconductor EuAs, and have evaluated transport up to x = 0.03. The results revealed a dramatic change in magnetotransport behavior with slight elemental substitutions. We have also succeeded in discovering a new compound that exhibits magnetic semiconducting behavior as the Eu-As binary compound, and have clarified the composition and lattice structure of this new compound by x-ray structure analysis and scanning transmission electron microscopy observation.
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| Academic Significance and Societal Importance of the Research Achievements |
本成果は、多様な相の存在や必要な蒸気圧・基板温度の問題によって選択的な成長が困難であったEu-As二元系について、II-V族分子線エピタキシー装置による薄膜成長が極めて有用であることを示している。Eu-As二元系化合物の中には、三角格子磁性半導体EuAs以外にも、磁性半導体的な性質を持ちかつフラストレートしたスピン配置をとる物質が多く存在し、今後の研究展開が期待される。
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