Visualization of magnon motion by time-resolved coherent soft x-ray microscopy

• Project/Area Number: 19H04399
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 80040:Quantum beam science-related
• Research Institution: National Institute for Materials Science
• Principal Investigator: YAMASAKI Yuichi 国立研究開発法人物質・材料研究機構, 統合型材料開発・情報基盤部門, 主幹研究員 (70571610)
• Co-Investigator(Kenkyū-buntansha): 横山 優一 公益財団法人高輝度光科学研究センター, 分光推進室, 博士研究員 (20824163)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000); Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2020: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2019: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
• Keywords: 磁性体 / 軟X線顕微鏡 / 強磁性共鳴 / X線磁気円二色性 / 共鳴X線散乱 / 磁気イメージング

Outline of Research at the Start

本研究では、コヒーレント回折イメージング法による高時空間分解能での磁気イメージングを行い、マグノン伝搬に関連した特異な磁気ダイナミクス現象を解明することを目的とする。例えば、磁気スキルミオンのようなメゾスコピックな磁気テクスチャでは、伸縮モードや回転モードなどの特徴的なマグノンモードが発現すると予想されている。放射光から発生する高輝度な軟X線の短パルス特性とコヒーレント特性を活用し、時間と空間に対して高い分解能を有するX線顕微鏡を開発し磁気ダイナミクスを観測する。これにより、マグノン伝搬における方向二色性などの特異な物性現象の起源を解明することを目指す。

Outline of Final Research Achievements

In this study, we combined a magnetic imaging technique with high temporal and spatial resolution using synchrotron soft X-rays and magnetic excitation by microwave irradiation to observe magnetic dynamics, such as the spatial propagation of magnons, which are spin-excited quasiparticles in magnetic materials. As a result, we succeeded in constructing a method to measure ferromagnetic resonance with a time resolution of 50 picoseconds and observed element-selective, spin- and orbital-separated ferromagnetic resonance. In soft X-ray microscopy, we developed a scanning transmission soft X-ray microscope that focuses soft X-rays to a few hundred nanometers using a Fresnel zone plate, and an in-line holography microscope that uses a two-dimensional detector to measure the interference between the transmitted light of focused soft X-rays and diffracted images of the sample.

Academic Significance and Societal Importance of the Research Achievements

軟X線顕微鏡とX線磁気円二色性によって強磁性共鳴を元素選択的、スピン-軌道選択的に時分割計測できる計測手法は、スピントロニクスデバイスやマグノニクスデバイス、スピン波を使ったリザバーコンピューティングなどの様々な磁性デバイス材料のオペランド計測に有効な手段であり、磁性体材料の磁気ダイナミクスを観測できる新しい計測手法を本研究で構築できたことは磁性物質・材料への先端計測の展開を拡充した点において意義があった。

Research Products

• [Journal Article] Phase Retrieval Algorithm based on Total Variation Regularization for Ferromagnetic Domain Patterns (2022)
  • Author(s): Yokoyama Yuichi、Yamasaki Yuichi、Okada Masato、Mizumaki Masaichiro
  • Journal Title: Journal of the Physical Society of Japan Volume: 91 Issue: 3 Pages: 034701-034701
  • DOI: 10.7566/jpsj.91.034701
  • NAID: 210000159603
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Zoology of Multiple‐Q Spin Textures in a Centrosymmetric Tetragonal Magnet with Itinerant Electrons (2022)
  • Author(s): Khanh Nguyen Duy、Nakajima Taro、Hayami Satoru、Gao Shang、Yamasaki Yuichi、Sagayama Hajime、Nakao Hironori、Takagi Rina、Motome Yukitoshi、Tokura Yoshinori、Arima Taka‐hisa、Seki Shinichiro
  • Journal Title: Advanced Science Volume: 9 Issue: 10 Pages: 2105452-2105452
  • DOI: 10.1002/advs.202105452
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Topological charge of soft X-ray vortex beam determined by inline holography (2022)
  • Author(s): Ishii Yuta、Nakao Hironori、Mizumaki Masaichiro、Wakabayashi Yusuke、Arima Taka-hisa、Yamasaki Yuichi
  • Journal Title: Scientific Reports Volume: 12 Issue: 1 Pages: 1044-1044
  • DOI: 10.1038/s41598-022-04933-5
  • Peer Reviewed / Open Access
• [Journal Article] Frustration-driven magnetic fluctuations as the origin of the low-temperature skyrmion phase in Co7Zn7Mn6 (2021)
  • Author(s): Ukleev V.、Karube K.、Derlet P. M.、Wang C. N.、Luetkens H.、Morikawa D.、Kikkawa A.、Mangin-Thro L.、Wildes A. R.、Yamasaki Y.、Yokoyama Y.、Yu L.、Piamonteze C.、Jaouen N.、Tokunaga Y.、R?nnow H. M.、Arima T.、Tokura Y.、Taguchi Y.、White J. S.
  • Journal Title: npj Quantum Materials Volume: 6 Issue: 1 Pages: 40-40
  • DOI: 10.1038/s41535-021-00342-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Alloying-induced enhancement of thermopower in the Dirac-semimetal system (2021)
  • Author(s): Fujioka J.、Kriener M.、Hashizume D.、Yamasaki Y.、Taguchi Y.、Tokura Y.
  • Journal Title: Physical Review Materials Volume: 5 Issue: 9 Pages: 094201-094201
  • DOI: 10.1103/physrevmaterials.5.094201
  • Peer Reviewed
• [Journal Article] X-ray study of ferroic octupole order producing anomalous Hall effect (2021)
  • Author(s): Kimata Motoi、Sasabe Norimasa、Kurita Kensuke、Yamasaki Yuichi、Tabata Chihiro、Yokoyama Yuichi、Kotani Yoshinori、Ikhlas Muhammad、Tomita Takahiro、Amemiya Kenta、Nojiri Hiroyuki、Nakatsuji Satoru、Koretsune Takashi、Nakao Hironori、Arima Taka-hisa、Nakamura Tetsuya
  • Journal Title: Nature Communications Volume: 12 Issue: 1 Pages: 5582-5582
  • DOI: 10.1038/s41467-021-25834-7
  • NAID: 120007153096
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High-pressure synthesis of Ba2RhO4, a rhodate analog of the layered perovskite Sr-ruthenate (2021)
  • Author(s): Kurata I.、Flores-Livas Jose A.、Sugimoto H.、Takahashi H.、Sagayama H.、Yamasaki Y.、Nomoto T.、Arita R.、Ishiwata S.
  • Journal Title: Physical Review Materials Volume: 5 Issue: 1 Pages: 015001-015001
  • DOI: 10.1103/physrevmaterials.5.015001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Signature of anisotropic exchange interaction revealed by vector-field control of the helical order in a FeGe thin plate (2021)
  • Author(s): Ukleev Victor、Utesov Oleg、Yu Le、Luo Chen、Chen Kai、Radu Florin、Yamasaki Yuichi、Kanazawa Naoya、Tokura Yoshinori、Arima Taka-hisa、White Jonathan S.
  • Journal Title: Physical Review Research Volume: 3 Issue: 1 Pages: 013094-013094
  • DOI: 10.1103/physrevresearch.3.013094
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sparse Phase Retrieval Algorithm for Coherent X-ray Diffraction Imaging (2020)
  • Author(s): 山崎裕一
  • Journal Title: Nihon Kessho Gakkaishi Volume: 62 Issue: 1 Pages: 10-16
  • DOI: 10.5940/jcrsj.62.10
  • NAID: 130007806180
  • ISSN: 0369-4585, 1884-5576
  • Year and Date: 2020-02-29
• [Journal Article] Field-induced spin reorientation in the antiferromagnetic Dirac material EuMnBi2 revealed by neutron and resonant x-ray diffraction (2020)
  • Author(s): H. Masuda, H. Sakai, H. Takahashi, Y. Yamasaki, A. Nakao, T. Moyoshi, H. Nakao, Y. Murakami, T. Arima, S. Ishiwata
  • Journal Title: Physical Review B Volume: 101 Issue: 17 Pages: 174411-174411
  • DOI: 10.1103/physrevb.101.174411
  • 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] High-field depinned phase and planar Hall effect in the skyrmion host Gd2PdSi3 (2020)
  • Author(s): Hirschberger Max、Nakajima Taro、Kriener Markus、Kurumaji Takashi、Spitz Leonie、Gao Shang、Kikkawa Akiko、Yamasaki Yuichi、Sagayama Hajime、Nakao Hironori、Ohira-Kawamura Seiko、Taguchi Yasujiro、Arima Taka-hisa、Tokura Yoshinori
  • Journal Title: Physical Review B Volume: 101 Issue: 22 Pages: 220401-220401
  • DOI: 10.1103/physrevb.101.220401
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Metastable solitonic states in the strained itinerant helimagnet FeGe (2020)
  • Author(s): Ukleev Victor、Yamasaki Yuichi、Utesov Oleg、Shibata Kiyou、Kanazawa Naoya、Jaouen Nicolas、Nakao Hironori、Tokura Yoshinori、Arima Taka-hisa
  • Journal Title: Physical Review B Volume: 102 Issue: 1 Pages: 014416-014416
  • DOI: 10.1103/physrevb.102.014416
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Augmented Magnetic Octupole in Kagome 120-degree Antiferromagnets Detectable via X-ray Magnetic Circular Dichroism (2020)
  • Author(s): Yamasaki Yuichi、Nakao Hironori、Arima Taka-hisa
  • Journal Title: Journal of the Physical Society of Japan Volume: 89 Issue: 8 Pages: 083703-083703
  • DOI: 10.7566/jpsj.89.083703
  • NAID: 40022313016
  • Peer Reviewed
• [Journal Article] Metamagnetic transitions and magnetoelectric responses in the chiral polar helimagnet Ni2InSbO6 (2020)
  • Author(s): Y. Araki, T. Sato, Y. Fujima, N. Abe, M. Tokunaga, S. Kimura, D. Morikawa, V. Ukleev, Y. Yamasaki, C. Tabata, H. Nakao, Y. Murakami, H. Sagayama, K. Ohishi, Y. Tokunaga, and T. Arima
  • Journal Title: PHYSICAL REVIEW B Volume: 102 Issue: 5 Pages: 054409-054409
  • DOI: 10.1103/physrevb.102.054409
  • Peer Reviewed
• [Journal Article] Topological Nernst Effect of the Two-Dimensional Skyrmion Lattice (2020)
  • Author(s): Hirschberger Max、Spitz Leonie、Nomoto Takuya、Kurumaji Takashi、Gao Shang、Masell Jan、Nakajima Taro、Kikkawa Akiko、Yamasaki Yuichi、Sagayama Hajime、Nakao Hironori、Taguchi Yasujiro、Arita Ryotaro、Arima Taka-hisa、Tokura Yoshinori
  • Journal Title: Physical Review Letters Volume: 125 Issue: 7 Pages: 076602-076602
  • DOI: 10.1103/physrevlett.125.076602
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Multiplication Method for Fine-Tuning Regularization Parameter of a Sparse Modeling Technique Tentatively Optimized via Cross Validation (2020)
  • Author(s): Nakanishi-Ohno Yoshinori、Yamasaki Yuichi
  • Journal Title: Journal of the Physical Society of Japan Volume: 89 Issue: 9 Pages: 094804-094804
  • DOI: 10.7566/jpsj.89.094804
  • Peer Reviewed / Open Access
• [Journal Article] Topological metastability supported by thermal fluctuation upon formation of chiral soliton lattice in CrNb3S6 (2020)
  • Author(s): Honda T.、Yamasaki Y.、Nakao H.、Murakami Y.、Ogura T.、Kousaka Y.、Akimitsu J.
  • Journal Title: Scientific Reports Volume: 10 Issue: 1 Pages: 18596-18596
  • DOI: 10.1038/s41598-020-74945-6
  • 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] Complete phase diagram of Sr1?xLaxFeO3 with versatile magnetic and charge ordering (2020)
  • Author(s): Onose M.、Takahashi H.、Sagayama H.、Yamasaki Y.、Ishiwata S.
  • Journal Title: Physical Review Materials Volume: 4 Issue: 11 Pages: 114420-114420
  • DOI: 10.1103/physrevmaterials.4.114420
  • Peer Reviewed
• [Journal Article] Soft-X-Ray Vortex Beam Detected by Inline Holography (2020)
  • Author(s): Ishii Yuta、Yamamoto Kohei、Yokoyama Yuichi、Mizumaki Masaichiro、Nakao Hironori、Arima Taka-hisa、Yamasaki Yuichi
  • Journal Title: Physical Review Applied Volume: 14 Issue: 6 Pages: 064069-064069
  • DOI: 10.1103/physrevapplied.14.064069
  • Peer Reviewed
• [Journal Article] Determination of crystallographic chirality of MnSi thin film grown on Si (111) substrate (2020)
  • Author(s): Morikawa Daisuke、Yamasaki Yuichi、Kanazawa Naoya、Yokouchi Tomoyuki、Tokura Yoshinori、Arima Taka-hisa
  • Journal Title: Physical Review Materials Volume: 4 Issue: 1 Pages: 014407-014407
  • DOI: 10.1103/physrevmaterials.4.014407
  • Peer Reviewed
• [Journal Article] Element-specific soft x-ray spectroscopy, scattering, and imaging studies of the skyrmion-hosting compound Co8Zn8Mn4 (2019)
  • Author(s): Ukleev V.、Yamasaki Y.、Morikawa D.、Karube K.、Shibata K.、Tokunaga Y.、Okamura Y.、Amemiya K.、Valvidares M.、Nakao H.、Taguchi Y.、Tokura Y.、Arima T.
  • Journal Title: Physical Review B Volume: 99 Issue: 14 Pages: 144408-144408
  • DOI: 10.1103/physrevb.99.144408
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High pressure synthesis of a quasi-one-dimensional GdFeO3-type perovskite PrCuO3 with nearly divalent Cu ions (2019)
  • Author(s): Ito Masaharu、Takahashi Hidefumi、Sakai Hideaki、Sagayama Hajime、Yamasaki Yuichi、Yokoyama Yuichi、Setoyama Hiroyuki、Wadati Hiroki、Takahashi Kanako、Kusano Yoshihiro、Ishiwata Shintaro
  • Journal Title: Chemical Communications Volume: 55 Issue: 61 Pages: 8931-8934
  • DOI: 10.1039/c9cc04656a
  • Peer Reviewed
• [Journal Article] Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet (2019)
  • Author(s): Kurumaji Takashi、Nakajima Taro、Hirschberger Max、Kikkawa Akiko、Yamasaki Yuichi、Sagayama Hajime、Nakao Hironori、Taguchi Yasujiro、Arima Taka-hisa、Tokura Yoshinori
  • Journal Title: Science Volume: 365 Issue: 6456 Pages: 914-918
  • DOI: 10.1126/science.aau0968
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Skyrmion phase and competing magnetic orders on a breathing kagom? lattice (2019)
  • Author(s): Hirschberger Max、Nakajima Taro、Gao Shang、Peng Licong、Kikkawa Akiko、Kurumaji Takashi、Kriener Markus、Yamasaki Yuichi、Sagayama Hajime、Nakao Hironori、Ohishi Kazuki、Kakurai Kazuhisa、Taguchi Yasujiro、Yu Xiuzhen、Arima Taka-hisa、Tokura Yoshinori
  • Journal Title: Nature Communications Volume: 10 Issue: 1 Pages: 5831-5831
  • DOI: 10.1038/s41467-019-13675-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 共鳴軟X 線散乱によるトポロジカル磁性体の研究 (2022)
  • Author(s): 山崎裕一
  • Organizer: 令和3年度真空学会東北・北海道部学術講演会
  • Invited
• [Presentation] 共鳴軟X線散乱によるオペランド磁気テクスチャ計測の現状と展望 (2022)
  • Author(s): 山崎裕一
  • Organizer: 2021年度量子ビームサイエンスフェスタ
  • Invited
• [Presentation] X-ray Magnetic Circular Dichroism in a Chiral Antiferromagnet (2022)
  • Author(s): Yuichi Yamasaki
  • Organizer: The 26th Hiroshima International Symposium on Synchrotron Radiation
  • Int'l Joint Research / Invited
• [Presentation] 共鳴軟X線散乱による磁気テクスチャ観測 (2022)
  • Author(s): 山崎裕一
  • Organizer: 日本磁気学会 第83回スピントロニクス専門研究会
  • Invited
• [Presentation] Resonant x-ray scattering study of topological magnetic textures (2021)
  • Author(s): Yuichi Yamasaki
  • Organizer: The 4th Workshop of the Reaction Infography (R-ing) Unit
  • Int'l Joint Research / Invited
• [Presentation] コヒーレント軟X線回折によるナノスケール磁気テクスチャのイメージング (2021)
  • Author(s): 山崎裕一
  • Organizer: 第68回応用物理学会春季学術講演会
  • Invited
• [Presentation] コヒーレント共鳴軟X線散乱によるトポロジカル磁気テクスチャの研究 (2021)
  • Author(s): 山崎裕一
  • Organizer: 日本物理学会 第76回年次大会（2021年）
  • Invited
• [Presentation] 「スパースモデリングを活用したコヒーレント軟X線回折イメージングの解析手法」 (2020)
  • Author(s): 山崎裕一
  • Organizer: 放射光学会 JSR2020 企画講演1『情報科学を駆使した最先端放射光イメージング』
  • Invited
• [Presentation] 「軟X線イメージングとsxCMOSへの期待」 (2020)
  • Author(s): 山崎裕一
  • Organizer: 放射光学会 JSR2020 企画講演5『次世代X線画像検出器と期待されるサイエンス』
  • Invited
• [Presentation] 「コヒーレント軟X線回折によるナノスケール磁気イメージング」 (2020)
  • Author(s): 山崎裕一
  • Organizer: 第67回応用物理学会春季学術講演会 シンポジウム『EUV・軟X線イメージングの描く未来』
  • Invited
• [Presentation] Resonant soft x-ray scattering strudy for topologocal magnetic texture (2020)
  • Author(s): Yuichi Yamasaki
  • Organizer: MAX IV-IMR joint workshop
  • Int'l Joint Research / Invited
• [Presentation] 時間反転対称性の破れた反強磁性体におけるX線磁気円二色性の理論的考察 (2020)
  • Author(s): 山崎裕一、中尾裕則、有馬孝尚
  • Organizer: 物理学会 春季大会 (2020年3月)
• [Presentation] 「時間反転対称性の破れた反強磁性体における X 線磁気円二色性の理論的考察 」 (2020)
  • Author(s): 山崎裕一、中尾裕則、有馬孝尚
  • Organizer: 放射光学会 JSR2020
• [Presentation] 「次世代放射光で期待されるコヒーレント軟X線を使った物性研究」 (2019)
  • Author(s): 山崎裕一
  • Organizer: 東大物性研LASORセミナー
  • Invited
• [Presentation] 「新放射光施設で期待されるスピントロニクス材料のオペランド顕微計測」 (2019)
  • Author(s): 山崎裕一
  • Organizer: 第11回放射光学会若手研究会「放射光を用いたナノ分光技術とスピントロニクスとの協奏」
  • Invited
• [Presentation] 「スパースモデリングによるX線回折データからの情報抽出」 (2019)
  • Author(s): 山崎裕一
  • Organizer: 2019年 第80回応用物理学会秋季学術講演会 シンポジウム「インフォマティクスが創る新しい材料科学とその実用化」
  • Invited
• [Presentation] 「次世代放射光施設で期待される共鳴軟X線散乱による拡張多極子のイメージング」 (2019)
  • Author(s): 山崎裕一
  • Organizer: 東北大理学研究科放射光シンポジウムー量子物質科学のフロンティアー
  • Invited
• [Presentation] 「スピンダイナミクス観測に向けた放射光による磁気イメージング」 (2019)
  • Author(s): 山崎裕一
  • Organizer: 放射光を利用した次世代の表面研究
  • Invited
• [Remarks]
  • URL: https://samurai.nims.go.jp/profiles/yamasaki_yuichi?locale=ja