Experimental investigation of coherent coupling between nuclear spin, lattice, and mechanical vibration

• Project/Area Number: 20H02599
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 29010:Applied physical properties-related
• Research Institution: The University of Tokyo
• Principal Investigator: Kikkawa Takashi 東京大学, 大学院工学系研究科(工学部), 助教 (60828846)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000); Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2020: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
• Keywords: スピントロニクス / 核スピン / 機械振動 / 格子振動 / フォノン / スピンゼーベック効果 / マグノン

Outline of Research at the Start

スピントロニクス分野は、二量子間のコヒーレント結合（強結合）を扱う量子物理系分野と融合され、新たなステージに突入しつつある。しかしながら、従来の電子スピンでは、その高い共鳴周波数がボトルネックとなり、力学系・機械振動系とのコヒーレント結合を実現することができなかった。本研究では、この状況を原子核スピンの集団歳差運動「核スピン波」を導入することで打開する。この励起状態は、格子系と強く結合し且つ、共鳴周波数をマクロサイズの機械共振器の振動周波数まで低くできる稀有な状態である。この核スピン波状態を利用して、スピン-力学運動間の角運動量・エネルギー変換に基づく物性工学を開拓する。

Outline of Final Research Achievements

In this study, we have explored high-frequency-input driven macroscopic mechanical motion, spin excitation, spin-current generation, and their reciprocal effects in mechanical oscillators and micro-bar devices. Furthermore, we aim to mark the beginning of a new science that incorporates nuclear spins which can be excited by very low-frequency inputs, approaching the resonant frequency of micro oscillators. Through this research, we succeeded in demonstrating the nuclear-spin Seebeck effect (i.e., a phenomenon that generates a spin current from nuclear spins via a heat current) and the spin-current volume effect (i.e., a phenomenon that causes mechanical vibration via spin-current injection) and so on. We have also succeeded in tuning coherent magnon-phonon coupling through element substitutions in yttrium iron garnets, and have obtained fruitful outcomes.

Academic Significance and Societal Importance of the Research Achievements

本研究により、原子核スピン（核スピン）からスピン流を生成したり或いは、逆にスピン流から機械振動を引き起こすという新しいタイプの物理現象群が開拓された。今後本研究で見出した手法を利用することで、核スピントロニクス分野やスピンメカニクス分野の発展及び学理構築が実現されていくと期待される。また本研究により、これまで利用が難しかった核スピンのもつ角運動量を超微細相互作用によって取り出すことが可能であることが見出された。これにより本研究課題の最終目標である、核スピンのもつ角運動量の相互変換効果に基づく新しい科学技術の創生に向けた進展が得られたといえる。

Research Products

• [Int'l Joint Research] カリフォルニア大学ロサンゼルス校(米国)
• [Int'l Joint Research] ヨハネス・グーテンベルク大学マインツ(ドイツ)
• [Int'l Joint Research] UCL ユニバーシティ・カレッジ・ロンドン(英国)
• [Int'l Joint Research] カリフォルニア大学ロサンゼル ス校(米国)
• [Int'l Joint Research] カリフォルニア大学ロサンゼルス校(米国)
• [Journal Article] Spin and spin current-From fundamentals to recent progress (2023)
  • Author(s): Maekawa Sadamichi、Kikkawa Takashi、Chudo Hiroyuki、Ieda Jun’ichi、Saitoh Eiji
  • Journal Title: Journal of Applied Physics Volume: 133 Issue: 2 Pages: 020902-020902
  • DOI: 10.1063/5.0133335
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Experimental observation of nuclear-spin Seebeck effect (2023)
  • Author(s): Kikkawa Takashi、Saitoh Eiji
  • Journal Title: JSAP Review Volume: 2023 Issue: 0 Pages: n/a
  • DOI: 10.11470/jsaprev.230403
  • ISSN: 2437-0061
  • Peer Reviewed / Open Access
• [Journal Article] Room-Temperature Ferromagnetism Manifests Itself in Ultrathin Pt Films (2023)
  • Author(s): Kikkawa Takashi
  • Journal Title: JPSJ News and Comments Volume: 20 Pages: 02-02
  • DOI: 10.7566/jpsjnc.20.02
  • Peer Reviewed
• [Journal Article] Nonlinear Magnon Polaritons (2023)
  • Author(s): Lee Oscar、Yamamoto Kei、Umeda Maki、Zollitsch Christoph W.、Elyasi Mehrdad、Kikkawa Takashi、Saitoh Eiji、Bauer Gerrit E. W.、Kurebayashi Hidekazu
  • Journal Title: Physical Review Letters Volume: 130 Issue: 4 Pages: 046703-046703
  • DOI: 10.1103/physrevlett.130.046703
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Mechanism of paramagnetic spin Seebeck effect (2023)
  • Author(s): Oyanagi Koichi、Takahashi Saburo、Kikkawa Takashi、Saitoh Eiji
  • Journal Title: Physical Review B Volume: 107 Issue: 1 Pages: 014423-014423
  • DOI: 10.1103/physrevb.107.014423
  • Peer Reviewed
• [Journal Article] Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids (2023)
  • Author(s): Kikkawa Takashi、Saitoh Eiji
  • Journal Title: Annual Review of Condensed Matter Physics Volume: 14 Issue: 1 Pages: 129-151
  • DOI: 10.1146/annurev-conmatphys-040721-014957
  • Peer Reviewed / Open Access
• [Journal Article] Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin-phonon interactions (2023)
  • Author(s): Rongione E.、Gueckstock O.、Mattern M.、Gomonay O.、Meer H.、Schmitt C.、Ramos R.、Kikkawa T.、Micica M.、Saitoh E.、Sinova J.、Jaffres H.、Mangeney J.、Goennenwein S. T. B.、Geprags S.、Kampfrath T.、Klaui M.、Bargheer M.、Seifert T. S.、Dhillon S.、Lebrun R.
  • Journal Title: Nature Communications Volume: 14 Issue: 1 Pages: 1818-1818
  • DOI: 10.1038/s41467-023-37509-6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Advances in Magnetics Roadmap on Spin-Wave Computing (2022)
  • Author(s): Chumak A. V.、Kabos P.、Wu M.、Abert C.、Adelmann C.、Adeyeye A. O.、Akerman J.、Aliev F. G.、Anane A.、Awad A.、Back C. H.、Barman A.、Bauer G. E. W.、Becherer M.、Beginin E. N.、Bittencourt V. A. S. V.、Blanter Y. M.、Bortolotti P.、Boventer I.、Bozhko D. A.、Kikkawa T. et al
  • Journal Title: IEEE Transactions on Magnetics Volume: 58 Issue: 6 Pages: 0800172-0800172
  • DOI: 10.1109/tmag.2022.3149664
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Observation of spin-current striction in a magnet (2022)
  • Author(s): Arisawa Hiroki、Shim Hang、Daimon Shunsuke、Kikkawa Takashi、Oikawa Yasuyuki、Takahashi Saburo、Ono Takahito、Saitoh Eiji
  • Journal Title: Nature Communications Volume: 13 Issue: 1 Pages: 2440-2440
  • DOI: 10.1038/s41467-022-30115-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Deciphering quantum fingerprints in electric conductance (2022)
  • Author(s): Daimon Shunsuke、Tsunekawa Kakeru、Kawakami Shinji、Kikkawa Takashi、Ramos Rafael、Oyanagi Koichi、Ohtsuki Tomi、Saitoh Eiji
  • Journal Title: Nature Communications Volume: 13 Issue: 1 Pages: 3160-3160
  • DOI: 10.1038/s41467-022-30767-w
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial BixY3-xFe5O12 films (2022)
  • Author(s): Kikkawa Takashi、Oyanagi Koichi、Hioki Tomosato、Ishida Masahiko、Qiu Zhiyong、Ramos Rafael、Hashimoto Yusuke、Saitoh Eiji
  • Journal Title: Physical Review Materials Volume: 6 Issue: 10 Pages: 104402-104402
  • DOI: 10.1103/physrevmaterials.6.104402
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Modulation of spin Seebeck effect by hydrogenation (2022)
  • Author(s): Ogata K.、Kikkawa T.、Saitoh E.、Shiomi Y.
  • Journal Title: Applied Physics Letters Volume: 120 Issue: 7 Pages: 072405-072405
  • DOI: 10.1063/5.0083012
  • Peer Reviewed
• [Journal Article] Observation of nuclear-spin Seebeck effect (2021)
  • Author(s): Kikkawa T.、Reitz D.、Ito H.、Makiuchi T.、Sugimoto T.、Tsunekawa K.、Daimon S.、Oyanagi K.、Ramos R.、Takahashi S.、Shiomi Y.、Tserkovnyak Y.、Saitoh E.
  • Journal Title: Nature Communications Volume: 12 Issue: 1 Pages: 4356-4356
  • DOI: 10.1038/s41467-021-24623-6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Extrinsic Surface Magnetic Anisotropy Contribution in Pt/Y3Fe5O12 Interface in Longitudinal Spin Seebeck Effect by Graphene Interlayer (2021)
  • Author(s): Lee WY, Park NW, Kang MS, Kim GS, Yoon YG, Lee SH, Choi KY, Kim KS, Kim JH, Seong MJ, Kikkawa T, Saitoh E, Lee SK.
  • Journal Title: ACS Applied Materials & Interfaces Volume: 13 Issue: 37 Pages: 45097-45104
  • DOI: 10.1021/acsami.1c13180
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Paramagnetic spin Hall magnetoresistance (2021)
  • Author(s): Koichi Oyanagi, Juan M. Gomez-Perez, Xian-Peng Zhang, Takashi Kikkawa, Yao Chen, Edurne Sagasta, Andrey Chuvilin, Luis E. Hueso, Vitaly N. Golovach, F. Sebastian Bergeret, Felix Casanova, and Eiji Saitoh
  • Journal Title: Physical Review B Volume: 104 Issue: 13 Pages: 1344281-14
  • DOI: 10.1103/physrevb.104.134428
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High In-Plane Seebeck Coefficients of Bi?Sb?Te Alloy Thin Films with Growth Texture and Their Field-Controlled Seebeck Coefficients (2021)
  • Author(s): Park No-Won、Lee Won-Yong、Kim Gil-Sung、Yoon Young-Gui、Kikkawa Takashi、Saitoh Eiji、Lee Sang-Kwon
  • Journal Title: The Journal of Physical Chemistry C Volume: 125 Issue: 4 Pages: 2373-2381
  • DOI: 10.1021/acs.jpcc.0c10926
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Observation of Magnon Polarization (2020)
  • Author(s): Y. Nambu, J. Barker, Y. Okino, T. Kikkawa, Y. Shiomi, M. Enderle, T. Weber, B. Winn, M. Graves-Brook, J. Tranquada, T. Ziman, M. Fujita, G.E.W. Bauer, E. Saitoh, and K. Kakurai
  • Journal Title: Physical Review Letters Volume: 125 Issue: 2 Pages: 27201-27201
  • DOI: 10.1103/physrevlett.125.027201
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Enhanced Spin Seebeck Effect in Monolayer Tungsten Diselenide Due to Strong Spin Current Injection at Interface (2020)
  • Author(s): Lee Sang‐Kwon、Lee Won‐Yong、Kikkawa Takashi、Le Chinh Tam、Kang Min‐Sung、Kim Gil‐Sung、Nguyen Anh Duc、Kim Yong Soo、Park No‐Won、Saitoh Eiji
  • Journal Title: Advanced Functional Materials Volume: 30 Issue: 35 Pages: 2003192-2003192
  • DOI: 10.1002/adfm.202003192
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Observation of quantum interference conductance fluctuations in metal rings with strong spin?orbit coupling (2020)
  • Author(s): Ramos R.、Makiuchi T.、Kikkawa T.、Daimon S.、Oyanagi K.、Saitoh E.
  • Journal Title: Applied Physics Letters Volume: 117 Issue: 24 Pages: 242402-242402
  • DOI: 10.1063/5.0031708
  • Peer Reviewed
• [Presentation] 核スピンを利用した低温熱電変換 (Nuclear-spin driven low-temperature thermoelectric effect) (2023)
  • Author(s): 吉川貴史, 齊藤英治
  • Organizer: 第14回 低温科学研究センター研究交流会
• [Presentation] キャント反強磁性体MnCO3のマイクロ波分光 (2023)
  • Author(s): 巻内崇彦, 吉川貴史, シッチャヌギリッツ タナポーン, 沼田淳希, 高橋三郎, 齊藤英治
  • Organizer: 第14回 低温科学研究センター研究交流会
• [Presentation] 原子核を利用したスピントロニクスの開拓 (2023)
  • Author(s): 吉川貴史
  • Organizer: 第４回若手放談会：エキゾチック核物理の将来
  • Invited
• [Presentation] Microwave spectroscopy for field dispersions in MnCO3 (MnCO3磁場分散のマイクロ波分光) (2023)
  • Author(s): 巻内崇彦, 吉川貴史, シッチャヌギリッツ タナポーン, 沼田淳希, 高橋三郎, 齊藤英治
  • Organizer: 第70回 応用物理学会 春季学術講演会
• [Presentation] 超伝導体MoGeにおける非線形熱電効果 (2023)
  • Author(s): 有沢洋希, 藤本雄人, 吉川貴史, 齊藤英治
  • Organizer: 日本物理学会 2023年春季大会
• [Presentation] 超伝導体MoGeにおける非線形熱電効果の観測に向けた測定手法の開発と理論モデル (2023)
  • Author(s): 藤本雄人, 有沢洋希, 吉川貴史, 齊藤英治
  • Organizer: 日本物理学会 2023年春季大会
• [Presentation] NiMnSbにおける核-電子スピン共鳴スペクトロスコピー (2023)
  • Author(s): 吉川貴史, 沼田淳希, 窪田崇秀, 関剛斎, 中堂博之, 巻内崇彦, 埋田真樹, 高梨弘毅, 齊藤英治
  • Organizer: 日本物理学会 2023年春季大会
• [Presentation] Microwave spectroscopy of canted antiferromagnet MnCO3 (2022)
  • Author(s): T. Makiuchi, T. Kikkawa, T. Sichanugrist, J. Numata, S. Takahashi, and E. Saitoh
  • Organizer: 29th International Conference on Low Temperature Physics (LT23)
  • Int'l Joint Research
• [Presentation] Observation of nuclear-spin Seebeck effect in Pt/MnCO3 (2022)
  • Author(s): T. Kikkawa, D. Reitz, H. Ito, T. Makiuchi, T. Sugimoto, K. Tsunekawa, S. Daimon, K. Oyanagi, R. Ramos, S. Takahashi, Y. Shiomi, Y. Tserkovnyak, and E. Saitoh
  • Organizer: SPIE Nanoscience + Engineering, Spintronics XV
  • Int'l Joint Research / Invited
• [Presentation] キャント反強磁性体MnCO3のマイクロ波スペクトロスコピー (2022)
  • Author(s): 巻内崇彦, 吉川貴史, シッチャヌギリッツ タナポーン, 沼田淳希, 高橋三郎, 齊藤英治
  • Organizer: 第13回 低温科学研究センター研究交流会
• [Presentation] Observation of nuclear-spin Seebeck effect (2021)
  • Author(s): T. Kikkawa, D. Reitz, H. Ito, T. Makiuchi, T. Sugimoto, K. Tsunekawa, S. Daimon, K. Oyanagi, R. Ramos, S. Takahashi, Y. Shiomi, Y. Tserkovnyak, and E. Saitoh
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] 核スピンに基づくゼーベック効果の観測 (2021)
  • Author(s): 吉川貴史, Derek Reitz, 伊藤宏陽, 巻内崇彦, 杉本宜陽, 恒川翔, 大門俊介, 大柳洸一, Rafael Ramos, 高橋三郎, 塩見雄毅, Yaroslav Tserkovnyak, 齊藤英治
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] Observation of nuclear-spin Seebeck effect (2021)
  • Author(s): T. Kikkawa, D. Reitz, H. Ito, T. Makiuchi, T. Sugimoto, K. Tsunekawa, S. Daimon, K. Oyanagi, R. Ramos, S. Takahashi, Y. Shiomi, Y. Tserkovnyak, and E. Saitoh
  • Organizer: The 5th Symposium for The Core Research Clusters for Materials Science and Spintronics, and the 4th Symposium on International Joint Graduate Program in Materials Science
• [Presentation] 核スピンゼーベック効果の観測 (2021)
  • Author(s): 吉川貴史、Derek Reitz、伊藤宏陽、巻内崇彦、杉本宜陽、恒川翔、大門俊介、大柳洸一、Rafael Ramos、高橋三郎、塩見雄毅、Yaroslav Tserkovnyak、齊藤英治
  • Organizer: 日本物理学会第76回年次大会
• [Presentation] Magnon-phonon hybridization in thermal spin transport (2020)
  • Author(s): T. Kikkawa
  • Organizer: CEMS Topical Meeting Online “Magnon-phonon coupling”
  • Int'l Joint Research / Invited
• [Remarks] 第11回エヌエフ基金研究開発奨励賞
  • URL: https://nf-foundation.or.jp/award/list/2022/winner.html
• [Remarks] 第14回低温科学研究センター研究交流会 ベスト・プレゼンテーション・アワード
  • URL: http://www.crc.u-tokyo.ac.jp/kenkyukoryu/index.html
• [Remarks] 世界初の核の自転を利用した熱発電～熱エネルギー利用技術・スピントロニクスに新たな可能性～
  • URL: https://www.t.u-tokyo.ac.jp/press/foe/press/setnws_202107261409014299427347.html