Innvative control method for soft materials based on nanospin dynamics

• Project/Area Number: 20K20294
• Project/Area Number (Other): 17H06227 (2017-2019)
• Research Category: Grant-in-Aid for Challenging Research (Pioneering)
• Allocation Type: Multi-year Fund (2020); Single-year Grants (2017-2019)
• Research Field: Applied condensed matter physics and related fields
• Research Institution: Kyushu University
• Principal Investigator: 木村 崇 九州大学, 理学研究院, 教授 (80360535)
• Co-Investigator(Kenkyū-buntansha): 松井 淳 九州大学, 理学研究院, 講師 (10274424) ; 大西 紘平 九州大学, 理学研究院, 助教 (30722293) ; 鴇田 昌之 九州大学, 理学研究院, 名誉教授 (80163963)
• Project Period (FY): 2020-04-01 – 2025-03-31
• Project Status: Granted (Fiscal Year 2023)
• Budget Amount: ¥26,000,000 (Direct Cost: ¥20,000,000、Indirect Cost: ¥6,000,000); Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2020: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2018: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2017: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
• Keywords: ナノ磁性体 / 接触角 / フリンジ磁界 / 反磁性 / 撥水性 / ナノ磁石 / 流体制御 / 微細パターン / スピン流 / スピンダイナミクス / ソフトマテリアル / 磁区構造 / スピン注入

Outline of Research at the Start

高精度で空間制御されたナノ磁性体のスピン配列により、水の濡れ性を制御する新奇な技術を確立し、これらを拡張することで、スピンを活用したソフトマテリアルの革新的制御手法を開発する。さらに同技術を界面制御技術へと高度化し、両系間の角運動量の受け渡しを実現する、すなわちスピントロニクスとソフトマテリアル材料の融合による新奇な量子物性分野の創生する。

Outline of Annual Research Achievements

本研究の目的は、高精度で形状制御されたナノ磁性体のスピンが創出する電磁場を用いて、革新的なソフトマテリアルの制御手法を開発することである。具体的には、磁性体表面上の水の濡れ性や対流などを通じて、ナノ磁性体中のスピンと流体が織りなす相互作用を定量的に明らかにし、同現象を各種液体やガス分子などの流体一般の制御技術へと高度化する。さらに、これらの系における量子力学的な相互作用をも引き出し、界面を介したスピン系と流体系の角運動量の受け渡し技術を開発する。流体とナノ磁性体との融合は、ソフトマテリアル系を活用したフレキシブル・スピントロニクスへの展開や特異な表面状態を反映した新量子物性現象など、これまで未開拓の新領域科学に切り込む格好の物質系である。加えて、スピン-動力の直接変換やマイクロ流体発電などの魅力的な工学的応用が期待できる。
今年度は、反応性イオンエッチング装置を用いた微細周期パターンの精度向上、更には、接触角測定器に温度制御器を取り付け、微小水滴蒸発過程の温度依存性を調べる機構を取り付けた。加えて、周期的なナノ磁性体パターンを用いた磁区構造制御法を開発し、より強いフリンジ磁界を発生させる構造の実現に成功した。一連の手法は、水滴制御の要素技術となり得るので、今後は、これらを結集して水滴制御の総まとめ的な実験を行いたい。

Current Status of Research Progress

3: Progress in research has been slightly delayed.

Reason

接触角、及びそのダイナミクスの温度依存性や水滴量依存性など、次々と新しい現象が見つかっているため、それらを考慮したうえでの水滴制御法を確立する必要があると判断したため。

Strategy for Future Research Activity

前述の通り、今年度得られた数多くの新しい知見（温度制御、水滴量の最適化、高精度微細加工技術、高強度フリンジ磁界）とこれまでの知見をまとめ、最終的な水滴制御を実現する。

Research Products

• [Journal Article] Efficient Thermo‐Spin Conversion in van der Waals Ferromagnet FeGaTe (2023)
  • Author(s): Liu Shuhan、Hu Shaojie、Cui Xiaomin、Kimura Takashi
  • Journal Title: Advanced Materials Volume: 36 Issue: 14
  • DOI: 10.1002/adma.202309776
  • Peer Reviewed
• [Journal Article] Field and temperature-controlled positive and negative exchange biases in CoO/YIG bilayers on GGG(111) (2023)
  • Author(s): Chang Po-Chun、Liu Shi-Yu、Lin Hung-Lin、Hu Shaojie、Kimura Takashi、Lo Fang-Yuh、Lin Wen-Chin
  • Journal Title: Journal of Alloys and Compounds Volume: 968 Pages: 172081-172081
  • DOI: 10.1016/j.jallcom.2023.172081
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Experimental and Theoretical Evaluation for Pressure Effects on Spin Hall Effect in Pt (2023)
  • Author(s): Iimori Riku、Obinata Sora、Yamazaki Taishiro、Mitsuda Akihiro、Kimura Takashi
  • Journal Title: IEEE Transactions on Magnetics Volume: 59 Issue: 11 Pages: 1-5
  • DOI: 10.1109/tmag.2023.3283467
  • Peer Reviewed
• [Journal Article] Enhanced spin accumulation in nano-pillar-based lateral spin valve using spin reservoir effect (2022)
  • Author(s): Cui Xiaomin、Hu Shaojie、Kimura Takashi
  • Journal Title: Journal of Physics D: Applied Physics Volume: 55 Issue: 16 Pages: 165004-165004
  • DOI: 10.1088/1361-6463/ac47bf
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Pressure-induced enhancement of spin-charge conversion efficiency in CoFeB/Pt bilayer (2022)
  • Author(s): Iimori Riku、Obinata Sora、Mitsuda Akihiro、Kimura Takashi
  • Journal Title: Applied Physics Express Volume: 15 Issue: 3 Pages: 033003-033003
  • DOI: 10.35848/1882-0786/ac5501
  • Peer Reviewed
• [Journal Article] Influence of heat flow control on dynamical spin injection in CoFeB/Pt/CoFeB trilayer (2022)
  • Author(s): Obinata Sora、Iimori Riku、Ohnishi Kohei、Kimura Takashi
  • Journal Title: Scientific Reports Volume: 12 Issue: 1 Pages: 3467-3470
  • DOI: 10.1038/s41598-022-06784-6
  • Peer Reviewed / Open Access
• [Journal Article] Experimental Evaluation of 3D Heat Flow Using Magneto‐Thermoelectric Effects in a Ferromagnetic Nanowire (2022)
  • Author(s): Kamruzzaman Md、Hu Shaojie、Ohnishi Kohei、Kimura Takashi
  • Journal Title: physica status solidi (RRL) ? Rapid Research Letters Volume: - Issue: 5 Pages: 2100608-2100608
  • DOI: 10.1002/pssr.202100608
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The positive exchange bias property with hopping switching behavior in van der Waals magnet FeGeTe (2022)
  • Author(s): Hu Shaojie、Cui Xiaomin、Yue Zengji、Wang Pangpang、Guo Lei、Ohnishi Kohei、Wang Xiaolin、Kimura Takashi
  • Journal Title: 2D Materials Volume: 9 Issue: 1 Pages: 015037-015037
  • DOI: 10.1088/2053-1583/ac456f
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Significant suppression of galvanomagnetic signal under dynamical spin injection in CoFeB/Pt bilayer (2021)
  • Author(s): Sora Obinata, Kohei Ohnishi and Takashi Kimura
  • Journal Title: Applied Physics Letters Volume: 118 Issue: 15 Pages: 152401-152401
  • DOI: 10.1063/5.0046601
  • Peer Reviewed
• [Journal Article] Interfacial exchange coupling modulated magnetism in the insulating heterostructure of CoOx/yttrium iron garnet (2021)
  • Author(s): Po-Chun Chang, Venkata Ramana Mudinepalli, Shi-Yu Liu, Hung-Lin Lin, Chuan-Che Hsu, Yu-Tso Liao, Sora Obinata,Takashi Kimura, Ming-Yau Chern Fang-Yuh Lo and Wen-Chin Lin
  • Journal Title: Journal of Alloys and Compounds Volume: -
• [Journal Article] Asymmetric nonlocal signal induced by thermoelectric effects in a lateral spin valve (2020)
  • Author(s): N. Asam, T. Ariki. and T. Kimura
  • Journal Title: Physica E Volume: 117 Pages: 113788-113788
  • DOI: 10.1016/j.physe.2019.113738
  • Peer Reviewed
• [Journal Article] Bolometric ferromagnetic resonance techniques for characterising spin-Hall effect at high temperatures (2019)
  • Author(s): P. Phu, K. Yamanoi, K. Ohnishi, J. Hyodo, K. Rogdakis, Y. Yamazaki, T. Kimura, H. Kurebayashi
  • Journal Title: Journal of Magnetism and Magnetic Materials Volume: 485 Pages: 304-307
  • DOI: 10.1016/j.jmmm.2019.04.070
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Thermal Spin-Valve Effect in Magnetic Multi-layered Nanowires (2019)
  • Author(s): N. Asam, K. Yamanoi, K. Ohnishi and T. Kimura
  • Journal Title: Journal of Superconductivity and Novel Magnetism Volume: 1 Issue: 10 Pages: 1-5
  • DOI: 10.1007/s10948-019-5016-5
  • Peer Reviewed / Open Access
• [Journal Article] Modification of magnetization dynamics of NiFe nanodot due to thermal spin injection (2018)
  • Author(s): N. Asam., K. Yamanoi and T. Kimura
  • Journal Title: Journal of Physics D Volume: 印刷中
  • Peer Reviewed
• [Presentation] Heat transports & magneto-thermoelectric effects in nano spintronic devices (2023)
  • Author(s): Takashi Kimura
  • Organizer: Coumpond Semiconductor Week
  • Int'l Joint Research / Invited
• [Presentation] Spin Absorption Effects due to Various Functional Materials (2022)
  • Author(s): Takashi Kimura
  • Organizer: Taiwan Phyisical Society
  • Int'l Joint Research / Invited
• [Presentation] Study of nano-scale heat transports using magneto-thermoelectric effects, (2022)
  • Author(s): Takashi Kimura
  • Organizer: 6th International Symposium on Frontiers in Materials Science
  • Int'l Joint Research / Invited
• [Presentation] 動的スピン注入における FMR 加熱効果の影響 (2020)
  • Author(s): 大日方初良，公田悠樹，桝本浩克，大西紘平，木村崇
  • Organizer: 第25回 半導体におけるスピン工学の基礎と応用 (PASPS-25)
• [Presentation] CoFeB/Ag/Bi三層膜における磁気抵抗効果とその圧力依存性 (2020)
  • Author(s): 飯森陸，大日方初良，光田暁弘，木村崇
  • Organizer: 第25回 半導体におけるスピン工学の基礎と応用 (PASPS-25)
• [Presentation] Influence of Ferromagnetic-Layer Thickness on Dynamical Spin Injection (2020)
  • Author(s): S. Obinata, K. Miyazaki, K. Ohnishi, and T. Kimura
  • Organizer: 65th Annual Conference on Magnetism and Magnetic Materials (MMM2020)
• [Presentation] 強磁性/非磁性二層薄膜における高周波電気磁気信号の解析 (2020)
  • Author(s): 大日方初良，宮崎圭司，伊藤大樹，大西紘平，木村崇
  • Organizer: 日本物理学会 第75回年次大会
• [Presentation] Non linear spin dynamics induced in magnetically coupled CoFeB/Pt/NiFe trilayer (2019)
  • Author(s): M. Yafuso, and T. Kimura
  • Organizer: 64th Annual Conference on Magnetism and Magnetic Materials (MMM2019)
  • Int'l Joint Research
• [Presentation] Electrical detection of diffusive spin current absorbed at Ag/Bi Rashba interface (2019)
  • Author(s): D. Itoh and T. Kimura
  • Organizer: 64th Annual Conference on Magnetism and Magnetic Materials (MMM2019)
  • Int'l Joint Research
• [Presentation] Nonlocal spin transport in strong spin-orbit bilayer spin channel (2019)
  • Author(s): T. Kimura
  • Organizer: Frontier in Material Science
  • Int'l Joint Research / Invited
• [Presentation] CoFeAl/Ag 界面における抵抗スイッチング現象とスピン依存伝導 (2018)
  • Author(s): 伊藤大樹, 有木大晟, 大西紘平, 木村崇
  • Organizer: 日本物理学会九州支部例会
• [Presentation] Efficient thermal spin injection based on metallic hybrid nanostructures (2018)
  • Author(s): Takashi Kimura
  • Organizer: Ulsan University Colloqium
  • Int'l Joint Research / Invited
• [Presentation] Manipulation of spin current (2018)
  • Author(s): Takashi Kimura
  • Organizer: National Taiwan Normarl University Physics Seminar
  • Int'l Joint Research / Invited
• [Presentation] Diffusive spin transports in metallic nanostructures (2018)
  • Author(s): Takashi Kimura
  • Organizer: Meinz summer school
  • Int'l Joint Research / Invited
• [Presentation] 強磁性ナノ細線における異常ネルンスト効果の効果的検出 (2018)
  • Author(s): 有木 大晟
  • Organizer: 日本物理学会年次会
• [Presentation] Spin Absorption Effects due to Various Functional Materials (2017)
  • Author(s): Takashi Kimura
  • Organizer: The 10th International Conference on Advanced Materials and Devices
  • Int'l Joint Research / Invited
• [Presentation] Efficient thermal spin injection in metallic hybrid nanostructures (2017)
  • Author(s): Takashi Kimura
  • Organizer: JSPS Core to Core workshop
  • Int'l Joint Research / Invited