2021 Fiscal Year Research-status Report
Topological spin textures in frustrated magnets and their coupling to conduction electrons
| Project/Area Number |
21K13877
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Hirschberger Maximilian (ヒルシュベルガーマックス) 東京大学, 大学院工学系研究科(工学部), 准教授 (70871482)
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| Project Period (FY) |
2021-04-01 – 2023-03-31
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| Keywords | Magnetism / Strong correlation / Spin chirality / Skyrmion |
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| Outline of Annual Research Achievements |
Although the research of FY2021 has focused on the same centrosymmetric intermetallics as proposed in the project plan, the scientific interest has shifted slightly towards the effect of thermal fluctuations on magnetic and electronic properties. In a ferromagnet Nd3Ru4Al12, thermal fluctuations above the ordering transition can create time-averaged spin chirality: K. Kolincio, M. Hirschberger, et. al., PNAS 118, e2023588118 (2021). Moreover, we report the importance of crystal lattice geometry on thermally induced spin chirality by comparing a triangular and a Kagome lattice: K. Kolincio, M. Hirschberger, et al., (submitted). The thermal effect is important, because emergent electromagnetic fields may be generated at elevated temperatures even far above the ordered state.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
The applicant started a new position as Associate Professor at the Department of Applied Physics, The University of Tokyo, in October 2021. Additional tasks related to the start-up of a new laboratory have required significant effort, but work on our research projects is progressing reasonably well. In addition to the abovementioned works focused on thermally induced spin chirality, we are currently preparing a manuscript on the meron-antimeron lattice in Gd2PdSi3. Moreover, we have used resonant elastic x-ray scattering at Photon Factory to discover a skyrmion lattice with commensurate locking to the crystal lattice in the intermetallic Gd3Ru4Al12 (manuscript in preparation).
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| Strategy for Future Research Activity |
This project lays the foundation for a series of further work, by developing new magnetic materials where the quantum ("Berry") phase of conduction electrons, driven by spin chirality of magnetic moments, plays an important role. We hope to further pursue transient spin-chiral processes, such as emergent electromagnetic induction, in the intermetallics R3Ru4Al12 (R: rare earth). Moreover, we hope to develop micrometer-sized devices of intermetallics for reading and writing of information from / to a spiral magnet using electrical currents: c.f. recently approved grant 22H04463. In addition, we are interested in resonant soft x-ray scattering on the present intermetallic materials, taking a closer look at the surface-dependent modification of magnetic textures in this class of compounds.
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| Remarks |
In October 2021, the applicant started a new research group in his new position as Associate Professor of Applied Physics (The University of Tokyo).
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