2023 Fiscal Year Final Research Report
Verification of ferromagnetism in Li-intercalated graphene
| Project/Area Number |
21K14533
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 29020:Thin film/surface and interfacial physical properties-related
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | グラフェン / インターカレーション / 炭化ケイ素 / フラットバンド / ファン・ホーブ特異性 |
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| Outline of Final Research Achievements |
In this study, we aimed to synthesize interlayer compounds based on graphene to produce two-dimensional ferromagnetic materials for spintronics applications. Specifically, we investigated the ferromagnetism arising from the strong correlation effect due to flat band occupation, a characteristic feature of graphene, as opposed to the transition metals typically employed for magnetic materials. We discovered that the flat band of graphene can be occupied by synthesizing interlayer compounds with lithium and calcium, which are electron-donating elements. We demonstrated that the flat band can be manipulated by varying the number of graphene layers and the structure of the silicon carbide surface used as a substrate. Additionally, we developed a system for measuring the anomalous Hall effect in ultrahigh vacuum, which is instrumental in detecting two-dimensional ferromagnetism.
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| Free Research Field |
半導体表面・界面電子物性
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| Academic Significance and Societal Importance of the Research Achievements |
本研究により、グラフェン層間化合物におけるフラットバンド占有に関して新しい学術的知見を得た。層間の元素種、侵入密度、そしてグラフェンの層数という３つの軸によってフラットバンドの制御が可能である。グラフェン層間への元素挿入は、電気化学的手法により可逆的に行うことが可能である。よって、将来的にはグラフェンにおける磁性の電気的制御の実現が期待される。これは、スピントロニクスのさらなる省電力化に貢献し、現在爆発的に増大している情報処理にかかる電力の削減が期待される。
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