| 研究課題/領域番号 |
23K13050
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分13030:磁性、超伝導および強相関系関連
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| 研究機関 | 東北大学 |
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研究代表者 |
TANG PING 東北大学, 材料科学高等研究所, 特任助教 (90927427)
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| 研究期間 (年度) |
2023-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
4,420千円 (直接経費: 3,400千円、間接経費: 1,020千円)
2024年度: 1,950千円 (直接経費: 1,500千円、間接経費: 450千円)
2023年度: 2,470千円 (直接経費: 1,900千円、間接経費: 570千円)
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| キーワード | magnon transport / antiferromagnetic order / Neel Seebeck effect / transport / magnons |
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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
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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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
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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| 今後の研究の推進方策 |
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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