研究課題/領域番号 |
19H00645
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研究種目 |
基盤研究(A)
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配分区分 | 補助金 |
応募区分 | 一般 |
審査区分 |
中区分13:物性物理学およびその関連分野
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研究機関 | 東北大学 |
研究代表者 |
Bauer Gerrit 東北大学, 材料科学高等研究所, 教授 (10620213)
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研究分担者 |
佐藤 浩司 東北大学, 金属材料研究所, 助教 (70708114)
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研究期間 (年度) |
2019-04-01 – 2024-03-31
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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 |
44,980千円 (直接経費: 34,600千円、間接経費: 10,380千円)
2023年度: 8,190千円 (直接経費: 6,300千円、間接経費: 1,890千円)
2022年度: 8,190千円 (直接経費: 6,300千円、間接経費: 1,890千円)
2021年度: 8,190千円 (直接経費: 6,300千円、間接経費: 1,890千円)
2020年度: 8,190千円 (直接経費: 6,300千円、間接経費: 1,890千円)
2019年度: 12,220千円 (直接経費: 9,400千円、間接経費: 2,820千円)
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キーワード | Spintronics / Magnonics / Cavities / Ferroelectrics / magnonics / cavities / ferroelectriscs / Photon Cavities / ferroelectrics |
研究開始時の研究の概要 |
We propose an input-output scattering theory of a new form of matter, viz. a composite assembly of magnetic and other macroscopic objects in microwave cavities. Two sub-mm magnetic spheres in a cavity form a magnonic hydrogen molecule by virtual exchange of cavity photons. A magnonic heterochemistry invokes added superconducting and/or ferroelectric elements. The non-linear collective dynamics are quantized at low temperature, and can be read-out optically, electrically, and mechanically, allowing microwave, electric, and optical long-distance information exchange and order parameter control.
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研究実績の概要 |
In the fiscal year 2021-22, we continued developing the magnon chemistry in several directions. The coupling of magnons with phonons, for example, led to the discovery of a new magnonic molecule of the Kittel mode of two distance magnets through a non-magnetic spacer over mm distances. This work was helped by a thorough theoretical analysis of the magnetoelastic boundary conditions. We also identified the importance of damping by magnon-induced eddy currents in proximity gates by direct imaging using diamond NV-center microscopy. We have been preparing the ground for the magnonics in 2D magnetic systems by carrying out analytic calculation in ferromagnetic single and double van der Waals layers as well as studying ultrathin layers of the magnetic insulator YIG. Making use of the analogies of magnetic and electric dipoles we invented the new field of “ferronics” that studies the elementary excitations of the ferroelectric order. The theoretical study laid the basis of a new Kiban S project led by Prof. K. Uchida from NIMS.
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現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The project continued to proceed in an auspicious way, mainly because of the inspiration we enjoyed from our experimental colleagues with whom we collaborate intensively. For example, the concept of the magnon-parametron invented by Eiji Saitoh c.s. has many interesting theoretical questions we were able to answer by non-linear magnonics. Challenging questions from Ken-ichi Uchida motivated us to develop the new field of ferronics.
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今後の研究の推進方策 |
Coming to the end of this project, we will continue to push the theory of magnon chemistry in different directions. The progress in material growth and device fabrication of magnetic tunnel junctions, magnetic insulators, and van der Waals materials deserves special attention of theory to describe two-dimensional systems, magnon-magnon interactions, antiferromagnets, and quantum effects. We will continue to use a combination of analytic and numerical method to inspire and get inspired by the experimental collaborators in Japan and the whole world.
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