2021 Fiscal Year Annual Research Report
Topological antiferromagnetic spin valve
| Project/Area Number |
21F21045
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
中辻 知 東京大学, 大学院理学系研究科(理学部), 教授 (70362431)
|
|---|
| 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
|
|---|
| Project Period (FY) |
2021-04-28 – 2023-03-31
|
| Keywords | antiferromagnets / TMR / nonvolatile memory |
|---|
| 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.
|
| Research Progress Status |
翌年度、交付申請を辞退するため、記入しない。
|
| Strategy for Future Research Activity |
翌年度、交付申請を辞退するため、記入しない。
|
