スピンゼーベック効果とマグノンダイナミクスの相関解明に関する研究

• Project/Area Number: 15J08026
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: 吉川 貴史 東北大学, 理学研究科, 特別研究員(DC1)
• Project Period (FY): 2015-04-24 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,400,000 (Direct Cost: ¥3,400,000); Fiscal Year 2017: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2016: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2015: ¥1,200,000 (Direct Cost: ¥1,200,000)
• Keywords: スピンゼーベック効果 / マグノン / マグノン-フォノン混成 / 熱的スピン流生成機構 / 熱電変換能向上 / 多層膜構造

Outline of Annual Research Achievements

本研究は、磁性体中のマグノンやフォノンなどの素励起とスピンゼーベック効果(SSE)との関係性を解明することを主たる目的する。本現象の発現メカニズムに対する理解が深まり、SSE素子の熱電変換能を向上させるための指針が得られれば、SSE型熱電変換デバイスの実現及び、今後の環境調和型の発電技術の発展に貢献できると考えられる。
平成29年度の主な成果は、以下の2点である。

(1) フォノン分散を変化させたBi置換YIG (BixY3-xFe5O12)試料における測定により、SSEにおけるフォノン分散関係の持つ役割がより明確となった: 昨年度の研究において、Y3Fe5O12 (YIG)のマグノンとフォノンの分散関係の相対位置関係を反映してSSEに異常なピーク信号が現れることを見出し、この現象は長寿命なマグノン-フォノン混成粒子によって発現していることを明らかにした。本研究では、YIGのフォノン速度を小さくできる Bi置換に伴うSSEにおけるピーク信号の磁場値の変化を系統的に調べた。Bi置換量の増大に伴いピーク信号が低磁場側にシフトするという結果が観測され、この結果が、フォノン分散の変化の観点から解釈できるということを明らかにした。本研究により、SSEにおけるフォノンの持つ役割がさらに明確になり、SSEの効率を改善するという観点においても良い前進となった。

(2) 強磁場・低温下のYIG/Pt接合のXMCD研究を通じて、Ptに非自明な常磁性モーメントが生じていることを明らかにした: Y3Fe5O12-白金Pt接合における強磁場(5 T)・低温(5.5 K)下のXMCD研究により、本条件下でPtに大きな常磁性モーメントが誘起されることを明らかにした。SSEなどのスピン流現象はすべて界面でのスピン変換を利用しており、ここで得られた知見は今後、スピン変換現象を理解する上で有用であるといえる。

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] Fudan University/Beijing Normal University(China)
• [Int'l Joint Research] Delft University of Technology/University of Groningen(オランダ)
• [Int'l Joint Research] Johannes Gutenberg-Universitat Mainz/University of Konstanz(Germany)
• [Int'l Joint Research] Delft University of Technology/Utrecht University/University of Groningen(オランダ)
• [Int'l Joint Research] Universidad de Zaragoza(Spain)
• [Int'l Joint Research] Johannes Gutenberg-Universitat Mainz(Germany)
• [Int'l Joint Research] Universidad de Zaragoza(Spain)
• [Int'l Joint Research] Johannes Gutenberg-Universitat Mainz(Germany)
• [Int'l Joint Research] Bielefeld University(Germany)
• [Int'l Joint Research] INRIM(Italy)
• [Journal Article] Magnon detection using a ferroic collinear multilayer spin valve (2018)
  • Author(s): J. Cramer, F. Fuhrmann, U. Ritzmann, V. Gall, T. Niizeki, R. Ramos, Z. Qiu, D. Hou, T. Kikkawa, J. Sinova, U. Nowak, E. Saitoh, and M. Kläui
  • Journal Title: Nature Communications Volume: 8 Issue: 1 Pages: 1089-1089
  • DOI: 10.1038/s41467-018-03485-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The bimodal distribution spin Seebeck effect enhancement in epitaxial Ni0.65Zn0.35Al0.8Fe1.2O4 thin film (2018)
  • Author(s): H. Wang, D. Hou, T. Kikkawa, R. Ramos, K. Shen, Z. Qiu, Y. Chen, M. Umeda, Y. Shiomi, X. Jin, and E. Saitoh
  • Journal Title: Applied Physics Letters Volume: 112 Issue: 14 Pages: 142406-142406
  • DOI: 10.1063/1.5022195
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Probing length-scale separation of thermal and spin currents by nanostructuring YIG (2017)
  • Author(s): Miura Asuka、Kikkawa Takashi、Iguchi Ryo、Uchida Ken-ichi、Saitoh Eiji、Shiomi Junichiro
  • Journal Title: Physical Review Materials Volume: 1 Issue: 1 Pages: 014601-014601
  • DOI: 10.1103/physrevmaterials.1.014601
  • Peer Reviewed
• [Journal Article] Detection of induced paramagnetic moments in Pt on Y3Fe5O12 via x-ray magnetic circular dichroism (2017)
  • Author(s): Kikkawa Takashi、Suzuki Motohiro、Okabayashi Jun、Uchida Ken-ichi、Kikuchi Daisuke、Qiu Zhiyong、Saitoh Eiji
  • Journal Title: Physical Review B Volume: 95 Issue: 21 Pages: 2144161-7
  • DOI: 10.1103/physrevb.95.214416
  • Peer Reviewed
• [Journal Article] Antiferromagnetic anisotropy determination by spin Hall magnetoresistance (2017)
  • Author(s): Wang Hua、Hou Dazhi、Qiu Zhiyong、Kikkawa Takashi、Saitoh Eiji、Jin Xiaofeng
  • Journal Title: Journal of Applied Physics Volume: 122 Issue: 8 Pages: 083907-083907
  • DOI: 10.1063/1.4986372
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nonlocal magnon-polaron transport in yttrium iron garnet (2017)
  • Author(s): L. J. Cornelissen, K. Oyanagi, T. Kikkawa, Z. Qiu, T. Kuschel, G. E. W. Bauer, B. J. van Wees, and E. Saitoh
  • Journal Title: Phys. Rev. B Volume: 96 Issue: 10 Pages: 104441-104441
  • DOI: 10.1103/physrevb.96.104441
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Temperature dependence of the spin Seebeck effect in [Fe3O4/Pt]n multilayers (2017)
  • Author(s): R. Ramos, T. Kikkawa, A. Anadon, I. Lucas, K. Uchida, P. A. Algarabel, L. Morellon, M. H. Aguirre, E. Saitoh, and M. R. Ibarra,
  • Journal Title: AIP Advances Volume: 7 Issue: 5 Pages: 055915-055915
  • DOI: 10.1063/1.4974060
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Magnon-polaron transport in magnetic insulators (2017)
  • Author(s): B. Flebus, K. Shen, T. Kikkawa, K. Uchida, Z. Qiu, E. Saitoh, R. A. Duine, and G. E. W. Bauer
  • Journal Title: Physical Review B Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Complete Suppression of Longitudinal Spin Seebeck Effect by Frozen Magnetization Dynamics in Y3Fe5O12 (2016)
  • Author(s): T. Kikkawa, K. Uchida, S. Daimon, and E. Saitoh,
  • Journal Title: Journal of the Physical Society of Japan Volume: 85 Issue: 6 Pages: 065003-065003
  • DOI: 10.7566/jpsj.85.065003
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Spin-current-driven thermoelectric generation based on interfacial spin-orbit coupling (2016)
  • Author(s): A. Yagmur, S. Karube, K. Uchida, K. Kondou, R. Iguchi, T. Kikkawa, Y. Otani, and E. Saitoh
  • Journal Title: Appl. Phys. Lett. Volume: 108 Issue: 24 Pages: 242409-242409
  • DOI: 10.1063/1.4953879
  • Peer Reviewed
• [Journal Article] Thermoelectric Generation Based on Spin Seebeck Effects (2016)
  • Author(s): K. Uchida, H. Adachi, T. Kikkawa, A. Kirihara, M. Ishida, S. Yorozu, S. Maekawa, and E. Saitoh
  • Journal Title: Proceedings of the Ieee Volume: 104 Issue: 7 Pages: 1499-1499
  • DOI: 10.1109/jproc.2016.2577478
  • Peer Reviewed
• [Journal Article] Magnon Polarons in the Spin Seebeck Effect (2016)
  • Author(s): Takashi Kikkawa, Ka Shen, Benedetta Flebus, Rembert A. Duine, Ken-ichi Uchida, Zhiyong Qiu, G. E. W. Bauer, and Eiji Saitoh
  • Journal Title: Physical Review Letters Volume: 117 Issue: 20 Pages: 207203-207203
  • DOI: 10.1103/physrevlett.117.207203
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Gamma radiation resistance of spin Seebeck devices (2016)
  • Author(s): A. Yagmur, K. Uchida, K. Ihara, I. Ioka, T. Kikkawa, M. Ono, J. Endo, K. Kashiwagi, T. Nakashima, A. Kirihara, M. Ishida, E. Saitoh,
  • Journal Title: Applied Physics Letters Volume: 109 Issue: 24 Pages: 243902-243902
  • DOI: 10.1063/1.4971976
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Thermoelectric generation based on spin Seebeck effects (2016)
  • Author(s): K. Uchida, H. Adachi, T. Kikkawa, A. Kirihara, M. Ishida, S. Yorozu, S. Maekawa, and E. Saitoh
  • Journal Title: Proceedings of the IEEE Volume: 印刷中 Issue: 10 Pages: 1946-1973
  • DOI: 10.1109/jproc.2016.2535167
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Evaluation of thermal gradients in longitudinal spin Seebeck effect measurements (2015)
  • Author(s): A. Sola, M. Kuepferling, V. Basso, M. Pasquale, T. Kikkawa, K. Uchida, E. Saitoh
  • Journal Title: Journal of Applied Physics Volume: 117 Issue: 17
  • DOI: 10.1063/1.4916762
  • Peer Reviewed
• [Journal Article] Transverse thermoelectric effect in La0.67Sr0.33O3| SrRuO3 superlattices (2015)
  • Author(s): Y. Shiomi, Y. Handa, T. Kikkawa, and E. Saitoh,
  • Journal Title: Applied Physics Letters Volume: 106 Issue: 23 Pages: 232403-232403
  • DOI: 10.1063/1.4922294
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] All-oxide spin Seebeck effects (2015)
  • Author(s): Z. Qiu, D. Hou, K. Uchida, and E. Saitoh,
  • Journal Title: Applied Physics Express Volume: 8 Issue: 8 Pages: 083001-083001
  • DOI: 10.7567/apex.8.083001
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Intrinsic surface magnetic anisotropy in Y3Fe5O12 as the origin of low-magnetic-field behavior of the spin Seebeck effect (2015)
  • Author(s): K. Uchida, J. Ohe, T. Kikkawa, S. Daimon, D. Hou, Z. Qiu, E. Saitoh
  • Journal Title: Physical Review B Volume: 92 Issue: 1 Pages: 014415-014415
  • DOI: 10.1103/physrevb.92.014415
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Anomalous Hall effect with giant hysteresis loop in La0.67Sr0.33MnO3|SrRuO3 superlattices (2015)
  • Author(s): Y.Shiomi, Y. Handa, T. Kikkawa, and E. Saitoh,
  • Journal Title: Physical Review B Volume: 92 Issue: 2 Pages: 024418-024418
  • DOI: 10.1103/physrevb.92.024418
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Critical suppression of spin Seebeck effect by magnetic fields (2015)
  • Author(s): T. Kikkawa, K. Uchida, S. Daimon, Z. Qiu, Y. Shiomi, and E. Saitoh,
  • Journal Title: Physical Review B Volume: 92 Issue: 6 Pages: 064413-064413
  • DOI: 10.1103/physrevb.92.064413
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Observation of inverse spin Hall effect in ferromagnetic FePt alloys using spin Seebeck effect (2015)
  • Author(s): T. Seki, K. Uchida, T. Kikkawa, Z. Qiu, E. Saitoh, and K. Takanashi,
  • Journal Title: Applied Physics Letters Volume: 107 Issue: 9 Pages: 092401-092401
  • DOI: 10.1063/1.4929691
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Enhancement of anomalous Nernst effects in metallic multilayers free from proximity-induced magnetism (2015)
  • Author(s): K. Uchida, T. Kikkawa, T. Seki, T. Oyake, J. Shiomi, Z. Qiu, K. Takanashi, and E. Saitoh,
  • Journal Title: Physical Review B Volume: 92 Issue: 9 Pages: 094414-094414
  • DOI: 10.1103/physrevb.92.094414
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Unconventional scaling and significant enhancement of the spin Seebeck effect in multilayers (2015)
  • Author(s): R. Ramos, T. Kikkawa, M. H. Aguirre, I. Lucas, A. Anadon, T. Oyake, K. Uchida, H. Adachi, J. Shiomi, P. A. Algarabel, L. Morellon, S. Maekawa, E. Saitoh, and M. R. Ibarra
  • Journal Title: Physical Review B Volume: 92 Issue: 22 Pages: 220407-220407
  • DOI: 10.1103/physrevb.92.220407
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Hybridized magnon-phonon excitation in spin Seebeck effect (2018)
  • Author(s): T. Kikkawa
  • Organizer: Reimei/GP-Spin/ ICC-IMR International Workshop “New Excitations in Spintronics”
  • Int'l Joint Research / Invited
• [Presentation] Magnon-phonon hybridization in spin Seebeck effect in BixY3-xFe5O12 films (2018)
  • Author(s): T. Kikkawa, K. Oyanagi, T. Hioki, M. Ishida, Z. Qiu, R. Ramos, Y. Hashimoto, and E. Saitoh
  • Organizer: 新学術領域研究（研究領域提案型）「ナノスピン変換科学」平成29年度年次報告会
• [Presentation] Hybridized magnon-phonon excitation in spin Seebeck effect in Bi3-xYxFe5O12 films (2018)
  • Author(s): T. Kikkawa, K. Oyanagi, T. Hioki, M. Ishida, Z. Qiu, R. Ramos, Y. Hashimoto, and E. Saitoh
  • Organizer: APS March Meeting 2018
  • Int'l Joint Research
• [Presentation] XMCD detection of paramagnetic induced moments in Pt on Y3Fe5O12 (2017)
  • Author(s): T. Kikkawa, M. Suzuki, J. Okabayashi, K. Uchida, D. Kikuchi, Z. Qiu, and E. Saitoh
  • Organizer: The AIMR International Symposium 2017 (AMIS2017)
  • Place of Presentation: 仙台国際センター
  • Year and Date: 2017-02-13
  • Int'l Joint Research
• [Presentation] 磁気弾性結合が磁性絶縁体中の熱的スピン流生成に与える影響 (2017)
  • Author(s): 吉川貴史, 内田健一, Zhiyong Qiu, 齊藤英治
  • Organizer: 日本物理学会 第72回年次大会
  • Place of Presentation: 大阪大学
• [Presentation] 低温・強磁場下のPt超薄膜/Y3Fe5O12接合系におけるPt界面磁性のXMCD測定 (2016)
  • Author(s): 吉川貴史, 鈴木基寛, 岡林潤, 内田健一, 菊池大介, 邱志勇, 齊藤英治
  • Organizer: 日本物理学会 第71回年次大会
  • Place of Presentation: 東北学院大学
  • Year and Date: 2016-03-19
• [Presentation] Origin of spin Seebeck effect revealed by high-magnetic-field measurements (2016)
  • Author(s): T. Kikkawa, K. Uchida, S. Daimon, Z. Qiu, Y. Shiomi, and E. Saitoh
  • Organizer: The AIMR International Symposium 2016 (AMIS2016)
  • Place of Presentation: 仙台国際センター
  • Year and Date: 2016-02-22
  • Int'l Joint Research
• [Presentation] マグノン-フォノン結合誘起スピンゼーベック効果の観測 (2016)
  • Author(s): 吉川貴史, Ka Shen, Benedetta Flebus, Rembert A. Duine, 内田健一, Zhiyong Qiu, Gerrit E. W. Bauer, 齊藤英治
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: 金沢大学
• [Presentation] XMCD detection of induced paramagnetic moment in Pt on Y3Fe5O12 (2016)
  • Author(s): T. Kikkawa, M. Suzuki, J. Okabayashi, K. Uchida, D. Kikuchi, Z. Qiu, and E. Saitoh
  • Organizer: The 61st Annual Magnetism and Magnetic Materials (MMM) Conference
  • Place of Presentation: New Orleans, USA
  • Int'l Joint Research
• [Presentation] Observation of a phonon anomaly in the spin Seebeck effect (2016)
  • Author(s): T. Kikkawa, K. Shen, B. Flebus, R. A. Duine, K. Uchida, Z. Qiu, G. E. W. Bauer, and E. Saitoh
  • Organizer: The 61st Annual Magnetism and Magnetic Materials (MMM) Conference
  • Place of Presentation: New Orleans, USA
  • Int'l Joint Research
• [Presentation] 多層膜構造における巨大スピンゼーベック効果：実験 (2015)
  • Author(s): R. Ramos, 吉川貴史, M. H. Aguirre, I. Lucas, A. Anadon, 小宅教文, 内田健一, 塩見淳一郎, P. A. Algarabel, L. Morellon, 齊藤英治, M. R. Ibarra
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-17
• [Presentation] Critical suppression of spin Seebeck effect by magnetic fields (2015)
  • Author(s): T. Kikkawa
  • Organizer: Workshop on ThermoSpin Effects
  • Place of Presentation: Zaragoza, Spain
  • Year and Date: 2015-07-03
  • Int'l Joint Research / Invited
• [Book] 固体物理 (2015)
  • Author(s): 吉川貴史, 内田健一
  • Total Pages: 15
  • Publisher: アグネ技術センター