Novel magnon transport phenomena under spin textures with nontrivial topology and symmetry

• Project/Area Number: 18H03685
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 13:Condensed matter physics and related fields
• Research Institution: The University of Tokyo (2019-2020); Institute of Physical and Chemical Research (2018)
• Principal Investigator: Seki Shinichiro 東京大学, 大学院工学系研究科(工学部), 准教授 (70598599)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥45,760,000 (Direct Cost: ¥35,200,000、Indirect Cost: ¥10,560,000); Fiscal Year 2020: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2019: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000); Fiscal Year 2018: ¥30,290,000 (Direct Cost: ¥23,300,000、Indirect Cost: ¥6,990,000)
• Keywords: スピントロニクス / マグノン / スキルミオン / トポロジー

Outline of Final Research Achievements

Recently, spin wave (magnon) is attracting attention as a new carrier of information and energy in insulators. In this project, we focused on magnetic skyrmions (i.e. vortex-like swirling spin texture) characterized by nontrivial topology and symmetry, and explored their exotic magnon transport properties experimentally. As a results, we discovered (1) nonreciprocal magnon transport, (2) nonreciprocal phonon (quantized lattice vibration) transport, (3) a new material hosting extremely small skyrmion spin texture, and (4) magnon hall effect.

Academic Significance and Societal Importance of the Research Achievements

従来のエレクトロニクスで用いられてきた金属中の伝導電子とは異なり、絶縁体中のマグノンには「ジュール発熱に伴うエネルギー損失を生じない」という利点があり、その積極的な活用は、情報処理の高効率化に向けた切り札となる可能性を秘めている。また、マグノンやフォノンは絶縁体における熱流の主要な担い手としても知られており、今回発見されたマグノン・フォノンの非相反伝搬現象とその性能向上のための指針は、効率的な熱制御のための新しい基盤技術の開発につながることが期待される。

Research Products

• [Int'l Joint Research] Karlsruhe Institute of Technology(ドイツ)
• [Int'l Joint Research] Karlsruher Institut Technologie/Hochfeld-Magnetlabor Dresden(ドイツ)
• [Int'l Joint Research] Helmholtz-Zentrum Dresden- Rossendorf/TU-Dresden/University of Augsburg(ドイツ)
• [Int'l Joint Research] University College London/Imperial College London(英国)
• [Int'l Joint Research] Budapest University of Technology(ハンガリー)
• [Int'l Joint Research] EPFL(スイス)
• [Journal Article] Nonreciprocity of spin waves in the conical helix state (2021)
  • Author(s): Ogawa N.、K?hler L.、Garst M.、Toyoda S.、Seki S.、Tokura Y.
  • Journal Title: Proceedings of the National Academy of Sciences Volume: 118 Issue: 8 Pages: 2022927118-2022927118
  • DOI: 10.1073/pnas.2022927118
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Imaging the coupling between itinerant electrons and localised moments in the centrosymmetric skyrmion magnet GdRu2Si2 (2020)
  • Author(s): Yasui Yuuki、Butler Christopher J.、Khanh Nguyen Duy、Hayami Satoru、Nomoto Takuya、Hanaguri Tetsuo、Motome Yukitoshi、Arita Ryotaro、Arima Taka-hisa、Tokura Yoshinori、Seki Shinichiro
  • Journal Title: Nature Communications Volume: 11 Issue: 1 Pages: 5925-5925
  • DOI: 10.1038/s41467-020-19751-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Particle-size dependent structural transformation of skyrmion lattice (2020)
  • Author(s): Takagi R.、Yamasaki Y.、Yokouchi T.、Ukleev V.、Yokoyama Y.、Nakao H.、Arima T.、Tokura Y.、Seki S.
  • Journal Title: Nature Communications Volume: 11 Issue: 1 Pages: 5685-5685
  • DOI: 10.1038/s41467-020-19480-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Structural analysis of high-pressure phase for skyrmion-hosting multiferroic Cu2OSeO3 (2020)
  • Author(s): Nishibori E.、Karatsu S.、Terakura C.、Takeshita N.、Kinoshita M.、Ishiwata S.、Tokura Y.、Seki S.
  • Journal Title: Physical Review B Volume: 102 Issue: 20 Pages: 2011061-2011065
  • DOI: 10.1103/physrevb.102.201106
  • Peer Reviewed
• [Journal Article] Bloch Lines Constituting Antiskyrmions Captured via Differential Phase Contrast (2020)
  • Author(s): Yasin Fehmi S.、Peng Licong、Takagi Rina、Kanazawa Naoya、Seki Shinichiro、Tokura Yoshinori、Yu Xiuzhen
  • Journal Title: Advanced Materials Volume: 32 Issue: 46 Pages: 2004206-2004206
  • DOI: 10.1002/adma.202004206
  • Peer Reviewed
• [Journal Article] Nanometric square skyrmion lattice in a centrosymmetric tetragonal magnet (2020)
  • Author(s): Khanh Nguyen Duy、Nakajima Taro、Yu Xiuzhen、Gao Shang、Shibata Kiyou、Hirschberger Max、Yamasaki Yuichi、Sagayama Hajime、Nakao Hironori、Peng Licong、Nakajima Kiyomi、Takagi Rina、Arima Taka-hisa、Tokura Yoshinori、Seki Shinichiro
  • Journal Title: Nature Nanotechnology Volume: 15 Issue: 6 Pages: 444-449
  • DOI: 10.1038/s41565-020-0684-7
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Emergent topological spin structures in centrosymmetric cubic perovskite SrFeO3 (2020)
  • Author(s): S. Ishiwata, T. Nakajima, J. -H. Kim, D. S. Inosov, N. Kanazawa, J. S. White, J. L. Gavilano, R. Georgii, K. M. Seemann, G. Brandl, P. Manuel, D. D. Khalyavin, S. Seki, Y. Tokunaga, M. Kinoshita, Y. W. Long, Y. Kaneko, Y. Taguchi, T. Arima, B. Keimer, and Y. Tokura
  • Journal Title: Phys. Rev. B Volume: 101 Issue: 13 Pages: 134406-134406
  • DOI: 10.1103/physrevb.101.134406
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Propagation dynamics of spin excitations along skyrmion strings (2020)
  • Author(s): Seki S.、Garst M.、Waizner J.、Takagi R.、Khanh N. D.、Okamura Y.、Kondou K.、Kagawa F.、Otani Y.、Tokura Y.
  • Journal Title: Nature Communications Volume: 11 Issue: 1 Pages: 1-7
  • DOI: 10.1038/s41467-019-14095-0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Controlled transformation of skyrmions and antiskyrmions in a non-centrosymmetric magnet (2020)
  • Author(s): L. Peng, R. Takagi, W. Koshibae, K. Shibata, K. Nakajima, T. Arima, N., Nagaosa, S. Seki, X. Z. Yu, Y. Tokura
  • Journal Title: Nature Nanotechnology Volume: 15 Issue: 3 Pages: 181-186
  • DOI: 10.1038/s41565-019-0616-6
  • Peer Reviewed
• [Journal Article] Creation of magnetic skyrmions by surface acoustic waves (2020)
  • Author(s): Yokouchi Tomoyuki、Sugimoto Satoshi、Rana Bivas、Seki Shinichiro、Ogawa Naoki、Kasai Shinya、Otani Yoshichika
  • Journal Title: Nature Nanotechnology Volume: 15 Issue: 5 Pages: 361-366
  • DOI: 10.1038/s41565-020-0661-1
  • Peer Reviewed
• [Journal Article] Phonon Magnetochiral Effect (2019)
  • Author(s): T. Nomura, X.-X. Zhang, S. Zherlitsyn, J. Wosnitza, Y. Tokura, N. Nagaosa, S. Seki
  • Journal Title: Phys. Rev. Lett. Volume: 122 Issue: 14 Pages: 145901-145901
  • DOI: 10.1103/physrevlett.122.145901
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Increased lifetime of metastable skyrmions by controlled doping (2019)
  • Author(s): Birch M. T.、Takagi R.、Seki S.、Wilson M. N.、Kagawa F.、?tefan?i? A.、Balakrishnan G.、Fan R.、Steadman P.、Ottley C. J.、Crisanti M.、Cubitt R.、Lancaster T.、Tokura Y.、Hatton P. D.
  • Journal Title: Physical Review B Volume: 100 Issue: 1 Pages: 014425-014425
  • DOI: 10.1103/physrevb.100.014425
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Microwave Directional Dichroism Resonant with Spin Excitations in the Polar Ferromagnet GaV4S8 (2019)
  • Author(s): Y. Okamura, S. Seki, S. Bordacs, A. Butykai, V. Tsurkan, I. Kezsmarki, and Y. Tokura
  • Journal Title: Phys. Rev. Lett. Volume: 122 Issue: 5 Pages: 057202-057202
  • DOI: 10.1103/physrevlett.122.057202
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnon-photon coupling in the noncollinear magnetic insulator Cu 2 OSeO 3 (2019)
  • Author(s): L. V. Abdurakhimov, S. Khan, N. A. Panjwani, J. D. Breeze, M. Mochizuki, S. Seki, Y. Tokura, J. J. L. Morton, and H. Kurebayashi
  • Journal Title: Phys. Rev. B Volume: 99 Issue: 14 Pages: 140401-140401
  • DOI: 10.1103/physrevb.99.140401
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Multiple-q non-collinear magnetism in an itinerant hexagonal magnet (2018)
  • Author(s): R. Takagi, J. S. White, S. Hayami, R. Arita, D. Honecker, H. M. Ronnow, Y. Tokura, S. Seki
  • Journal Title: Science Advances Volume: 4 Issue: 11 Pages: 3402-3402
  • DOI: 10.1126/sciadv.aau3402
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Uniaxial-stress Effects on Helimagnetic Orders and Skyrmion Lattice in Cu2OSeO3 (2018)
  • Author(s): T. Nakajima, V. Ukleev, K. Ohishi, H. Oike, F. Kagawa, S. Seki, K. Kakurai, Y. Tokura, T. Arima
  • Journal Title: J. Phys. Soc. Jpn. Volume: 87 Issue: 9 Pages: 094709-094709
  • DOI: 10.7566/jpsj.87.094709
  • NAID: 210000134960
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Skyrmions in Centrosymmetric Magnets (2020)
  • Author(s): S. Seki
  • Organizer: Materials Research Society (MRS) Fall Meeting
  • Int'l Joint Research / Invited
• [Presentation] 磁気スキルミオンの物質設計と三次元ダイナミクス (2020)
  • Author(s): 関 真一郎
  • Organizer: ISSPワークショップ「量子物質研究の最近の進展と今後の展望」
  • Invited
• [Presentation] Coherent signal transfer along skyrmion strings (2019)
  • Author(s): S. Seki
  • Organizer: British-German WE-Heraeus-Seminar “Skyrmions in Magnetic Materials”
  • Int'l Joint Research / Invited
• [Presentation] Propagating spin excitations along skyrmion strings (2019)
  • Author(s): S. Seki
  • Organizer: Annual Conference on Magnetism and Magnetic Materials (MMM)
  • Int'l Joint Research / Invited
• [Presentation] Coherent signal transfer along skyrmion strings (2019)
  • Author(s): S. Seki
  • Organizer: The Future of Topological Materials, Princeton
  • Int'l Joint Research / Invited
• [Presentation] Coherent propagation of spin excitations along skyrmion strings (2019)
  • Author(s): S. Seki
  • Organizer: Magnonics
  • Int'l Joint Research / Invited
• [Presentation] Coherent signal transfer along skyrmion strings (2019)
  • Author(s): S. Seki
  • Organizer: 第43回日本磁気学会学術講演会
  • Invited
• [Presentation] 磁気スキルミオンの物質設計 (2019)
  • Author(s): 関 真一郎
  • Organizer: 第4回固体化学フォーラム研究会
  • Invited
• [Presentation] スキルミオンひもを用いた情報伝送 (2019)
  • Author(s): 関 真一郎
  • Organizer: 新学術領域研究「トポロジーが紡ぐ物質科学のフロンティア」第4回領域研究会
  • Invited
• [Presentation] Coherent signal transfer through skyrmion strings (2019)
  • Author(s): S. Seki
  • Organizer: International School on Spintronics and Korea-Japan Spintronics Workshop
  • Int'l Joint Research / Invited
• [Presentation] スキルミオンストリングを使った情報伝送 (2019)
  • Author(s): 関 真一郎
  • Organizer: 日本物理学会2019年春季大会
  • Invited
• [Presentation] Coherent signal transfer along skyrmion strings (2018)
  • Author(s): S. Seki
  • Organizer: Kavli ITS-APW-Tsinghua-RIKEN Workshop
  • Int'l Joint Research / Invited
• [Presentation] Skyrmions in Chiral Multiferroic Insulators (2018)
  • Author(s): S. Seki
  • Organizer: International Conference on Magnetism (ICM)
  • Int'l Joint Research / Invited
• [Presentation] Coherent signal transfer through skyrmion strings (2018)
  • Author(s): S. Seki
  • Organizer: Sol-Skymag
  • Int'l Joint Research / Invited
• [Presentation] Magnetic skyrmions: Particles and Strings (2018)
  • Author(s): 関 真一郎
  • Organizer: 日本物理学会2018年秋季大会
  • Invited
• [Remarks] 東京大学 大学院工学系研究科 物理工学専攻 / 総合研究機構 関研究室
  • URL: http://sekilab.net
• [Remarks] 磁気渦の新しい生成機構を発見 －磁気渦を情報担体とする磁気記憶素子の実現に期待－
  • URL: http://www.riken.jp/pr/press/2018/20181117_1/