| Project/Area Number |
23K13050
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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 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | Tohoku University |
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Principal Investigator |
TANG PING 東北大学, 材料科学高等研究所, 特任助教 (90927427)
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| Project Period (FY) |
2023-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2024: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2023: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | magnon transport / antiferromagnetic order / Neel Seebeck effect / transport / magnons |
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| Outline of Research at the Start |
Antiferromagnets are characterized by spontaneous antiferromagnetic order formed by anti-parallel aligned magnetic moments. This research is to address the essential role of the antiferromagnetic order in transport and the associated couplings with the spin, charge and heat transport.
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| Outline of Annual Research Achievements |
Magnons, spin excitations in magnetically ordered states, favor spin transport over long distances. However, it remains an entirely open question how the magnons can transport the antiferromagnetic order. I previously investigated the analogous transport problem of the ferroelectric order and proposed the concept of “ferrons” that enable electric polarization transport. Based on this, I have formulated here the magnon transport theory of the antiferromagnetic order and predicted the coupled transport between the antiferromagnetic order and heat, which gives rise to the "Neel" Seebeck effect. I also showed that the transport of the antiferromagnetic order could be converted to an electric current. These results will be published in a journal.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
This research project consists two main steps. The first step is how to describe the properties of magnons in antiferromagnetic materials, and the second is how to establish the non-equilibrium magnon transport theory of the antiferromagnetic order in the presence of external perturbations and various realistic scatterings. I completed the first step by finding that magnons carry both the antiferromagnetic order and spins. Inspired by my previous works on ferroelectric order transport, I established the Boltzmann transport equation for the magnons in antiferromagnetic materials. By solving this equation, I have predicted some interesting phenomena associated with the transport of the antiferromagnetic order.
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| Strategy for Future Research Activity |
The next task is to explore experimental verifications and potential implications of the transport of antiferromagnetic order in the field of spintronics. For instance, how to convert the current of the antiferromagnetic order to an electric current, and what is the coupling between the antiferromagnetic order and spin transport. These problems could be tackled by investigating a bilayer of antiferromagnetic and nonmagnetic metals with a coupling between the antiferromagnetic order and conduction electrons.
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