2015S2-007
共鳴X線散乱による磁気テクスチャとそのダイナミクスの観測

Last modified 2022-12-07 by s-proposalpfiqst.kek.jp

●基本情報
　●実験責任者：山崎　裕一（東大工）
　●課題有効期間：2015/10〜2018/9
　●実験ステーション：3A, 4C, 8A, 8B, 11B, 13A/B, 16A, 2A/B, AR-NW14A

●課題の概要
　近年、ナノメートルスケールのトポロジカルなスピン渦構造であるスキルミオンが注目されている。スキルミオンは電場や電流、温度勾配に対して巨大な応答を示すことから、次世代のスピントロニクスデバイスにおける新たな情報媒体への応用が期待されている。このようなナノスケールの磁気テクスチャは、電子自由度の秩序構造とも強く相関しており多彩な物性を創発している。その電子状態やダイナミクス、外場応答を直接的に観測することは、基礎物性の理解と共に、応用研究においても非常に重要となる。このような観点から、磁気テクスチャの秩序構造と電子状態を、高感度・高速・高い位置分解能で観測できる実験手法の必要性がますます高まっている。
　本S2型課題研究では、共鳴軟X線小角散乱を中心手法としてナノスケールの磁気 テクスチャ、および、それと相関のある電子秩序構造の観測を行う。特に、共鳴X線散乱の特性を最大限に活かした、コヒーレントX線回折によるホログラフィー測定や位相回復アルゴリズムによる磁気テクスチャの実空間イメージング、パルス放射光を使った時分割測定による磁気テクスチャの高速ダイナミクス観測、電流・電場・磁場・応力など多彩な外場に対する磁気テクスチャの応答観測を行っていく。これらの研究により、磁気テクスチャの基礎物性を構造物性・電子物性の観点から解明し、強相関電子系やスピントロニクス物質で観測される顕著な創発物性の発現機構解明を目指していく。

●成果発表
　●論文

• "Zoology of Multiple-Q Spin Textures in a Centrosymmetric Tetragonal Magnet with Itinerant Electrons"
  Nguyen Duy Khanh, Taro Nakajima, Satoru Hayami, Shang Gao, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Rina Takagi, Yukitoshi Motome, Yoshinori Tokura, Taka-hisa Arima, Shinichiro Seki
  Adv. Sci., 9 (2022) 2105452.
• "Time-resolved resonant soft X-ray scattering combined with MHz synchrotron X-ray and laser pulses at the Photon Factory"
  Ryo Fukaya, Jun-ichi Adachi, Hironori Nakao, Yuichi Yamasaki, Chihiro Tabata, Shunsuke Nozawa, Kouhei Ichiyanagi, Yuta Ishii, Hiroyuki Kimura, and Shin-ichi Adachi
  J. Synchrotron Rad., 29 (2022) 1414.
• "Photoinduced transient states of antiferromagnetic orderings in La_1/3Sr_2/3FeO₃ and SrFeO_3−δ thin films observed through time-resolved resonant soft x-ray scattering"
  Kohei Yamamoto, Tomoyuki Tsuyama, Suguru Ito, Kou Takubo, Iwao Matsuda, Niko Pontius, Christian Schüßler-Langeheine, Makoto Minohara, Hiroshi Kumigashira, Yuichi Yamasaki, Hironori Nakao, Youichi Murakami, Takayoshi Katase, Toshio Kamiya and Hiroki Wadati
  New J. Phys., 24 (2022) 043012.
• "Soft-X-Ray Vortex Beam Detected by Inline Holography"
  Yuta Ishii, Kohei Yamamoto, Yuichi Yokoyama, Masaichiro Mizumaki, Hironori Nakao, Taka-hisa Arima, and Yuichi Yamasaki
  Phys. Rev. Applied, 14 (2020) 064069.
• "Complete phase diagram of Sr_1–xLa_xFeO₃ with versatile magnetic and charge ordering"
  M. Onose, H. Takahashi, H. Sagayama, Y. Yamasaki, and S. Ishiwata
  Phys. Rev. Materials, 4 (2020) 114420.
• "Particle-size dependent structural transformation of skyrmion lattice"
  R. Takagi, Y. Yamasaki, T. Yokouchi, V. Ukleev, Y. Yokoyama, H. Nakao, T. Arima, Y. Tokura & S. Seki
  Nature Communications, 11 (2020) 5685.
• "Topological metastability supported by thermal fluctuation upon formation of chiral soliton lattice in CrNb₃S₆"
  T. Honda, Y. Yamasaki, H. Nakao, Y. Murakami, T. Ogura, Y. Kousaka & J. Akimitsu
  Sci. Rep., 10 (2020) 18596.
• "Metamagnetic transitions and magnetoelectric responses in the chiral polar helimagnet Ni₂InSbO₆"
  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
  Phys. Rev. B, 102 (2020) 054409.
• "Metastable solitonic states in the strained itinerant helimagnet FeGe"
  Victor Ukleev, Yuichi Yamasaki, Oleg Utesov, Kiyou Shibata, Naoya Kanazawa, Nicolas Jaouen, Hironori Nakao, Yoshinori Tokura, and Taka-hisa Arima
  Phys. Rev. B, 102 (2020) 014416.
• "High-field depinned phase and planar Hall effect in the skyrmion host Gd₂PdSi₃"
  Max Hirschberger, Taro Nakajima, Markus Kriener, Takashi Kurumaji, Leonie Spitz, Shang Gao, Akiko Kikkawa, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Seiko Ohira-Kawamura, Yasujiro Taguchi, Taka-hisa Arima, and Yoshinori Tokura
  Phys. Rev. B, 101 (2020) 220401(R).
• "Field-induced spin reorientation in the antiferromagnetic Dirac material EuMnBi₂ revealed by neutron and resonant x-ray diffraction"
  H. Masuda, H. Sakai, H. Takahashi, Y. Yamasaki, A. Nakao, T. Moyoshi, H. Nakao, Y. Murakami, T. Arima, and S. Ishiwata
  Phys. Rev. B, 101 (2020) 174411.
• "Observation of Chiral Magnetic Soliton Lattice State in CrNb₃S₆ by Coherent Soft X-ray Diffraction Imaging"
  Chihiro Tabata, Yuichi Yamasaki, Yuichi Yokoyama, Rina Takagi, Takashi Honda, Yusuke Kousaka, Jun Akimitsu and Hironori Nakao
  JPS Conf. Proc., 30 (2020) 011194.
• "Determination of crystallographic chirality of MnSi thin film grown on Si (111) substrate"
  Daisuke Morikawa, Yuichi Yamasaki, Naoya Kanazawa, Tomoyuki Yokouchi, Yoshinori Tokura, and Taka-hisa Arima
  Phys. Rev. Materials, 4 (2020) 014407.
• "Electronic Ordering States in Strongly Correlated Electron System Studied by Resonant X-ray Scattering"
  Hironori Nakao and Yuichi Yamasaki
  JPS Conf. Proc., 25 (2019) 011020.
• "High pressure synthesis of a quasi-one-dimensional GdFeO₃-type perovskite PrCuO₃ with nearly divalent Cu ions"
  Masaharu Ito, Hidefumi Takahashi, Hideaki Sakai, Hajime Sagayama, Yuichi Yamasaki, Yuichi Yokoyama, Hiroyuki Setoyama, Hiroki Wadati, Kanako Takahashi, Yoshihiro Kusano and Shintaro Ishiwata
  Chem. Commun., 55 (2019) 8931.
• "Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet"
  Takashi Kurumaji, Taro Nakajima, Max Hirschberger, Akiko Kikkawa, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Yasujiro Taguchi, Taka-hisa Arima, Yoshinori Tokura
  Science, 365 (2019) 6456.
• "Element-specific soft x-ray spectroscopy, scattering, and imaging studies of the skyrmion-hosting compound Co₈Zn₈Mn₄"
  V. Ukleev, Y. Yamasaki, D. Morikawa, K. Karube, K. Shibata, Y. Tokunaga, Y. Okamura, K. Amemiya, M. Valvidares, H. Nakao, Y. Taguchi, Y. Tokura, and T. Arima
  Phys. Rev. B, 99 (2019) 144408.
• "Commensurate versus incommensurate charge ordering near the superconducting dome in Ir_1−xPt_xTe₂ revealed by resonant x-ray scattering"
  K. Takubo, K. Yamamoto, Y. Hirata, H. Wadati, T. Mizokawa, R. Sutarto, F. He, K. Ishii, Y. Yamasaki, H. Nakao, Y. Murakami, G. Matsuo, H. Ishii, M. Kobayashi, K. Kudo, and M. Nohara
  Phys. Rev. B, 97 (2018) 205142.
• "Tensile-Strain-Dependent Spin States in Epitaxial LaCoO₃ Thin Films"
  Y. Yokoyama, Y. Yamasaki, M. Taguchi, Y. Hirata, K. Takubo, J. Miyawaki, Y. Harada, D. Asakura, J. Fujioka, M. Nakamura, H. Daimon, M. Kawasaki, Y. Tokura, and H. Wadati
  Phys. Rev. Lett., 120 (2018) 206402.
• "Thickness dependence and dimensionality effects on charge and magnetic orderings in La_1/3Sr_2/3FeO₃ thin films"
  K. Yamamoto, Y. Hirata, M. Horio, Y. Yokoyama, K. Takubo, M. Minohara, H. Kumigashira, Y. Yamasaki, H. Nakao, Y. Murakami, A. Fujimori, and H. Wadati
  Phys. Rev. B, 97 (2018) 075134.
• "Coherent Resonant Soft X-ray Scattering Study of Magnetic Textures in FeGe"
  Victor Ukleev, Yuichi Yamasaki, Daisuke Morikawa, Naoya Kanazawa, Yoshihiro Okamura, Hironori Nakao, Yoshinori Tokura and Taka-hisa Arima
  Quantum Beam Science, 2 (2018) 3.
• "Emergence and magnetic-field variation of chiral-soliton lattice and skyrmion lattice in the strained helimagnet Cu₂OSeO₃"
  Y. Okamura, Y. Yamasaki, D. Morikawa, T. Honda, V. Ukleev, H. Nakao, Y. Murakami, K. Shibata, F. Kagawa, S. Seki, T. Arima, and Y. Tokura
  Phys. Rev. B, 96 (2017) 174417.
• "High-pressure synthesis of an unusual antiferromagnetic metal CaCoO₃ with GdFeO₃-type perovskite structure"
  T. Osaka, H. Takahashi, H. Sagayama, Y. Yamasaki, and S. Ishiwata
  Phys. Rev. B, 95 (2017) 224440.
• "Directional electric-field induced transformation from skyrmion lattice to distinct helices in multiferroic Cu₂OSeO₃"
  Y. Okamura, Y. Yamasaki, D. Morikawa, T. Honda, V. Ukleev, H. Nakao, Y. Murakami, K. Shibata, F. Kagawa, S. Seki, T. Arima, and Y. Tokura
  Phys. Rev. B, 95 (2017) 184411.
• "Surface Ordering of Orbitals at a Higher Temperature in LaCoO₃ Thin Film"
  Yuichi Yamasaki, Jun Fujioka, Hironori Nakao, Jun Okamoto, Takaaki Sudayama, Youichi Murakami, Masao Nakamura, Masashi Kawasaki, Takahisa Arima, and Yoshinori Tokura
  J. Phys. Soc. Jpn., 85 (2016) 023704.
• "Quantum Hall effect in a bulk antiferromagnet EuMnBi₂ with magnetically confined two-dimensional Dirac fermions"
  Hidetoshi Masuda, Hideaki Sakai, Masashi Tokunaga, Yuichi Yamasaki, Atsushi Miyake, Junichi Shiogai, Shintaro Nakamura, Satoshi Awaji, Atsushi Tsukazaki, Hironori Nakao, Youichi Murakami, Taka-hisa Arima, Yoshinori Tokura and Shintaro Ishiwata
  Sci. Adv., 2 (2016) e1501117.
• "Dynamical process of skyrmion-helical magnetic transformation of the chiral-lattice magnet FeGe probed by small-angle resonant soft x-ray scattering"
  Y. Yamasaki, D. Morikawa, T. Honda, H. Nakao, Y. Murakami, N. Kanazawa, M. Kawasaki, T. Arima, and Y. Tokura
  Phys. Rev. B, 92 (2015) 220421(R).