| Project/Area Number |
21F21045
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 29010:Applied physical properties-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
中辻 知 東京大学, 大学院理学系研究科(理学部), 教授 (70362431)
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| Co-Investigator(Kenkyū-buntansha) |
CHEN XIANZHE 東京大学, 理学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2021: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | antiferromagnets / TMR / nonvolatile memory |
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| Outline of Research at the Start |
The main reason is the fact that large variations of density of states are difficult to realize. So far, the most successful demonstrations still work below 1%, which is far below the value necessary for commercial applications. Recently, the work in Nakatsuji's group shows the Neel vector in topological antiferromagnetic Mn3Sn can be rotated at least 60 deg by spin current, which indicates the possibility of achieving tunneling magnetoresistance via the spin-tunneling mechanism, similar to the case to ferromagnets.
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| Outline of Annual Research Achievements |
In FM/NM/FM trilayers (FM: ferromagnet, NM: nonmagnet), the change of relative orientation between the two FM moments could lead to varying opposition to the tunneling current flow: this tunneling magnetoresistance (TMR) is proportional to the spin polarization of FMs as is characterized by the Julliere’s model, and thus it is not usually seen in antiferromagnets with negligible spin polarization. Here, we demonstrate the existence of antiferromagnetic TMR in a magnetic octupole valve Mn3Sn/MgO/Mn3Sn, supported by the theory. Remarkably, although the spin polarization rate is three orders smaller than that of Fe, Mn3Sn/MgO/Mn3Sn shows 5 times larger TMR than Fe/MgO/Mn3S. This emphasizes the dominant role of octupole polarization, instead of spin polarization.
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| Research Progress Status |
翌年度、交付申請を辞退するため、記入しない。
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| Strategy for Future Research Activity |
翌年度、交付申請を辞退するため、記入しない。
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