研究成果

2024

1. “Microscopic evaluation of spin and orbital moment in ferromagnetic resonance”,
   Yuta Ishii, Yuichi Yamasaki, Yusuke Kozuka. Jana Lustikova, Yoichi Nii, Yoshinori Onose, Yuichi Yokoyama, Masaichiro Mizumaki, Jun-ichi Adachi. Hironori Nakao, Taka-hisa Arima. Yusuke Wakabayashi
   Scientific Reports 14,,15504 (2024); 10.1038/s41598-024-66139-1

2. " Lattice-commensurate skyrmion texture in a centrosymmetric breathing kagome magnet",
   Max Hirschberger, Bertalan G. Szigeti, Mamoun Hemmida, Moritz M. Hirschmann, Sebastian Esser, Hiroyuki Ohsumi, Yoshikazu Tanaka, Leonie Spitz, Shang Gao, Kamil K. Kolincio, Hajime Sagayama, Hironori Nakao, Yuichi Yamasaki, László Forró, Hans-Albrecht Krug von Nidda, Istvan Kezsmarki, Taka-hisa Arima, Yoshinori Tokura,
   npj Quantum Materials. 9 [1] 45  (2024); 10.1038/s41535-024-00654-2
   
   

2023

Original Paper

1. "Field-tunable Weyl points and large anomalous Hall effects in degenerate magnetic semiconductor EuMg2Bi2",
   M. Kondo, M. Ochi, R. Kurihara, A. Miyake, Y. Yamasaki, M. Tokunaga, H. Nakao, K. Kuroki, T. Kida, M. Hagiwara, H. Murakawa, N. Hanasaki, H. Sakai
   Phys. Rev. B 107, L121112 (2023); 10.1103/PhysRevB.107.L121112

2. "Ferroic order for anisotropic magnetic dipole term in collinear antiferromagnets of (t2g)4 system",
   Norimasa Sasabe, Masaichiro Mizumaki, Takayuki Uozumi, and Yuichi Yamasaki
   Phys. Rev. Lett. 131, 216501 (2023); 10.1103/PhysRevLett.131.216501 ; 2023/11/23
   Editor's suggestion, Front Coverに選ばれました

3. "Quadrupole anomalous Hall effect in magnetically induced electron nematic state",
   Hiroki Koizumi, Yuichi Yamasaki*, and Hideto Yanagihara*
   Nature Communications 14, 8074 (2023); 10.1038/s41467-023-43543-1; 2023/12/8

Pre-print Paper

• "Spintronic superconductor in a bulk layered material with natural spin-valve structure", 
  Shunsuke Sakuragi, S. Sasaki, R. Akashi, R. Sakagami, K. Kuroda, C. Bareille, T. Hashimoto, T. Nagashima, Y. Kinoshita, Y. Hirata, M. Shimozawa, S. Asai, T. Yajima, S. Doi, N. Tsujimoto, S. Kunisada, R. Noguchi, K. Kurokawa, N. Azuma, K. Hirata, Y. Yamasaki, H. Nakao, T. K. Kim, C. Cacho, T. Masuda , M. Tokunaga, H. Wadati, K. Okazaki, S. Shin, Y. Kamihara, Minoru Yamashita, Takeshi Kondo;
  arXiv: 2001.07991

Proceedings

1. "Development of Multi-scale Soft X-ray Diffraction Microscope for Observing Spin Textures",
   Yuta Ishii, Yusuke Kozuka, Yuichi Yamasaki, and Hironori Nakao
   JPS Conf. Proc. 38, 011190 (2023) [5 pages]
   https://doi.org/10.7566/JPSCP.38.011190 

Invited Talk

1. 「X線で観る強磁性のような反強磁性体」
   　大阪大学基礎工学科固体物理セミナー, 2023/12/15 15:10-16:40

2022

Original Paper

1. "Topological Charge of Soft X-ray Vortex Beam Determined by Inline Holography",
   Yuta Ishi, Hironori Nakao, Masaichiro Mizumaki, Yusuke Wakabayashi, Taka-hisa Arima, and Yuichi Yamasaki
   Scientific Reports 12, 1044 (2022); 10.1038/s41598-022-04933-5; 2022/1/20

2. "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,
   Advanced Science 9, (10), 2105452 (2022); 10.1002/advs.202105452; 2022/1/28

3. "Phase Retrieval Algorithm based on Total Variation Regularization for Ferromagnetic Domain Patterns",
   Yuichi Yokoyama, Yuichi Yamasaki, Masato Okada, and Masaichiro Mizumaki,
   J. Phys. Soc. Jpn. 91, 034701 (2022); 10.7566/JPSJ.91.034701; 2022/2/1 

4. "Photoinduced Transient States of Antiferromagnetic Orderings in La1/3Sr2/3FeO3 and SrFeO3−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 Schußler-Langeheine, Makoto Minohara, Hiroshi Kumigashira, Yuichi Yamasaki, Hironori Nakao, Youichi Murakami, Takayoshi Katase, Toshio Kamiya, and Hiroki Wadati,
   New J. Phys. 24 043012 (2022);10.1088/1367-2630/ac5f31; 2022/4/7

5. "Spin-charge coupling and decoupling in perovskite-type iron oxides (Sr1−xBax)2/3La1/3FeO3",
   M. Onose, H. Takahashi, T. Saito, T. Kamiyama, R. Takahashi, H. Wadati, S. Kitao, M. Seto, H. Sagayama, Y. Yamasaki, T. Sato, F. Kagawa, and S. Ishiwata,
   Phys. Rev. Materials 6, 094401 (2022); 10.1103/PhysRevMaterials.6.094401; 2022/9/6

6. "Time-resolved resonant soft X-ray scattering combined with MHz synchrotron X-ray and laser pulses at the Photon Factory ",
   R. Fukaya, J. Adachi, H. Nakao, Y. Yamasaki, C. Tabata, S. Nozawa, K. Ichiyanagi, Y. Ishii, H. Kimura and S. Adachi,
   J. Synchrotron Rad. 29, 1414-1419 (2022); 10.1107/S1600577522008724

7. "Possible helimagnetic order in Co4+-containing perovskites Sr1−xCaxCoO3",
   Hidefumi Takahashi,  Masaho Onose, Yasuhito Kobayashi, Takahiro Osaka, Soushi Maeda,  Atsushi Miyake,  Masashi Tokunaga,  Hajime Sagayama,  Yuichi Yamasaki, and  Shintaro Ishiwata,
   APL Materials 10, 111116 (2022); 10.1063/5.0101473
   
   

Invited Talk

2. 「共鳴軟X 線散乱によるトポロジカル磁性体の研究」
   　令和3年度⽇本表⾯真空学会東北・北海道⽀部学術講演会, 2022/3/3 14:00-14:30

3. 「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」
   2021年度量子ビームサイエンスフェスタ、2022/3/8 15:10-15:35

4.  "X-ray Magnetic Circular Dichroism in a Chiral Antiferromagnet"
   The 26th Hiroshima International Symposium on Synchrotron Radiation, 2022/3/10, 16:45-17:20

5. 「共鳴軟X線散乱による磁気テクスチャ観測」
   日本磁気学会 第83回スピントロニクス専門研究会、2022/3/30 14:30-15:00

6. 「軟X線顕微計測による磁気テクスチャの研究」 、
   日本顕微鏡学会 第78回学術講演会、2022/05/11 15:00-15:30、ビッグパレットふくしま（郡山市）

7. 「回折図形の位相回復におけるスパースモデリングの適用」、
   顕微鏡計測インフォマティックス研究部会　第4回研究会、
   2022/10/22 15:15 - 15:45、ファインセラミックスセンター （名古屋市）

2021

Published Paper

1. Motoi Kimata, Norimasa Sasabe, Kensuke Kurita, Yuichi Yamasaki, Chihiro Tabata, Yuichi Yokoyama, Yoshinori Kotani, Muhammad Ikhlas, Takahiro Tomita, Kenta Amemiya, Hiroyuki Nojiri, Satoru Nakatsuji, Takashi Koretsune, Hironori Nakao, Taka-hisa Arima & Tetsuya Nakamura,
   "X-ray study of ferroic octupole order producing anomalous Hall effect",
   Nature Communications 12, 5582 (2021) ;  10.1038/s41467-021-25834-7 ; 2021/9/22

2. J. Fujioka, M. Kriener, D. Hashizume, Y. Yamasaki, Y. Taguchi, and Y. Tokura,
   "Alloying-induced enhancement of thermopower in the Dirac-semimetal system Cd3-xZnxAs2",
   Phys. Rev. Materials 5, 094201 (2021); 10.1103/PhysRevMaterials.5.094201; 2021/9/7

3. V. Ukleev, K. Karube, P.M. Derlet, C.N. Wang, H. Luetkens, D. Morikawa, A. Kikkawa, L. Mangin-Thro, A.R. Wildes, Y. Yamasaki, Y. Yokoyama, L. Yu, C. Piamonteze, N. Jaouen, Y. Tokunaga, H.M. Rønnow, T.-h. Arima, Y. Tokura, Y. Taguchi, and J.S. White,
   "Frustration-driven magnetic fluctuations as the origin of the low temperature skyrmion phase in Co7Zn7Mn6" ,
   npj Quantum Materials 6, 40 (2021); 10.1038/s41535-021-00342-5; 2021/4/23;

4. Hiroya Shike, Rihito Kuroda, Maasa Murata, Yasuyuki Fujihara, Manabu Suzuki, Shoma Harada , Taku Shibaguchi, Naoya Kuriyama, Takaki Hatsui, Jun Miyawaki, Tetsuo Harada, Yuichi Yamasaki, Takeo Watanabe, Yoshihisa Harada, and Shigetoshi Sugawa,
   "A Global Shutter Wide Dynamic Range Soft X-Ray CMOS Image Sensor with Backside-Illuminated Pinned Photodiode, Two-Stage Lateral Overflow Integration Capacitor and Voltage Domain Memory Bank",
   IEEE Transactions on Electron Devices 68, 2056 (2021); 10.1109/TED.2021.3062576; 2021/3/15

5. Shinji Michimura, Masashi Kosaka, Ayumi Machida, Ryosuke Numakura, Ryosuke Iizuka, Susumu Katano, Yoshiki Imai, Naoki Shirakawa, Yuichi Yamasaki, Hironori Nakao, Hitoshi Sato, Shigenori  Ueda, and Kojiro Mimura,
   "Charge-ordered state and low-dimensional magnetic fluctuations in Yb5Ge4 single crystal",
   J. Phys. Soc. Jpn. 90, 044703 (2021); 10.7566/JPSJ.90.044703; 2021/3/5

6. "Signature of anisotropic exchange interaction revealed by vector-field control of the helical order in a FeGe thin plate",
   Victor Ukleev, Oleg Utesov, Le Yu, Chen Luo, Kai Chen, Florin Radu, Yuichi Yamasaki, Naoya Kanazawa, Yoshinori Tokura, Taka-hisa Arima, and Jonathan S. White,
   Phys. Rev. Res. 3, 013094 (2021); 10.1103/PhysRevResearch.3.013094; 2021/1/29

7. "High-pressure synthesis of Ba2RhO4, a rhodate analog of the layered perovskite Sr-ruthenate",
   I. Kurata, José A. Flores-Livas, H. Sugimoto, H. Takahashi, H. Sagayama, Y. Yamasaki, T. Nomoto, R. Arita, and S. Ishiwata,
   Phys. Rev. Mat. 5, 015001 (2021); 10.1103/PhysRevMaterials.5.015001; 2021/1/26
   
   

Review Paper

1. 「共鳴X線散乱による軌道混成状態の観測」、中尾裕則, 石井祐太, 田端千紘, 山﨑裕一、放射光学会誌 34 (2), 55 (2021)

2. 三石 和貴, 中澤 克昭, 溝口 照康, 佐川 隆亮, 山崎 裕一、 ピクセル型STEM検出器によるタイコグラフィーの初歩、 顕微鏡 (2021); 31-37 10.11410/kenbikyo.56.1_31

Book

1. "Spin-Crossover Cobaltite" Springer Series in Materials Science, Okimoto, Y., Saitoh, T., Kobayashi, Y., Ishihara, S. (Eds.), (2021), Chapter 5

Invited talk

1.  日本物理学会 第76回年次大会（2021年）  シンポジウム「放射光科学のフロンティア：最新動向と将来展望」
   「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」

2.  第68回 応用物理学会 シンポジウム「EUV・軟Ｘ線イメージングの描く未来」
   「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」

3. SCTM2020ワークショップ（https://sites.google.com/view/sctm-workshop/）
   「共鳴X線散乱によるトポロジカル磁性体の研究」 

4. "Resonant x-ray scattering study of topological magnetic textures", The 4th Workshop of the Reaction Infography (R-ing) Unit, 2021/11/4 15:00-15:30

2020

Published Papers

1. "Soft X-ray Vortex Beam detected by In-line Holography", 
   Yuta Ishii, Kohei Yamamoto, Yuichi Yokoyama, Masaichiro Mizumaki, Hironori Nakao, Taka-hisa Arima, Yuichi Yamasaki;
   Phys. Rev. Applied 14, 064069 (2020); 10.1103/PhysRevApplied.14.064069; 2020/12/24, arXiv:2006.16552

2. "Complete phase diagram of Sr1−xLaxFeO3 with versatile magnetic and charge ordering",
   M. Onose, H. Takahashi, H. Sagayama, Y. Yamasaki, and S. Ishiwata,
   Physical Review Materials.4, 114420 (2020); 10.1103/PhysRevMaterials.4.114420 ; 2020/11/30 

3. "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, 5685 (2020);  10.1038/s41467-020-19480-8; 2020/11/11

4. "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,
   Scientific Reports. 10, 18596 (2020) ;10.1038/s41598-020-74945-6 (* Corresponding author)

5. "Multiplication Method for Fine-tuning Regularization Parameter of a Sparse Modeling Technique Optimized via Cross Validation ",
   Yoshinori Nakanishi-Ohno and Yuichi Yamasaki,
   J. Phys. Soc. Jpn. 89, 094804 (2020) ;10.7566/JPSJ.89.094804 

6. "Topological Nernst effect of the two-dimensional skyrmion lattice",
   Max Hirschberger, Leonie Spitz, Takuya Nomoto, Takashi Kurumaji, Shang Gao, Jan Masell, Taro Nakajima, Akiko Kikkawa, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Yasujiro Taguchi, Ryotaro Arita, Taka-hisa Arima, and Yoshinori Tokura;
   Phys. Rev. Lett. 125, 076602 (2020) 10.1103/PhysRevLett.125.076602/ 

7. "Metamagnetic transitions and magnetoelectric responses in a chiral polar helimagnet Ni2InSbO6",
   Yusuke Araki, Tatsuki Sato, Yuri Fujima, Nobuyuki Abe, Masashi Tokunaga, Shojiro Kimura, Daisuke Morikawa, Victor Ukleev, Yuichi Yamasaki, Chihiro Tabata, Hironori Nakao, Youichi Murakami, Hajime Sagayama, Kazuki Ohishi, Yusuke Tokunaga, Taka-hisa Arima,
   Phys. Rev. B 102, 014416 (2020) ; arXiv:1912.02363; 10.1103/physrevb.102.014416 

8. "Augmented magnetic octupole in Kagome 120-degree antiferromagnets detectable via x-ray magnetic circular dichroism",
   Y. Yamasaki, H. Nakao, T. Arima,
   J. Phys. Soc. Jpn. 89, 083703 (2020) ; 10.7566/jpsj.89.083703 

9. "Metastable solitonic states in the strained itinerant helimagnet FeGe",
   Victor Ukleev, Yuichi Yamasaki, Oleg Utesov, Kiyou Shibata, Naoya Kanazawa, Nicolas Jaouen, Yoshinori Tokura, Taka-hisa Arima,
   Phys. Rev. B 102, 014416 (2020); arXiv:2004.12426 ; 2020/7/10

10. "High field isotropic phase and planar Hall effect in 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, 220401(R) (2020);  10.1103/PhysRevB.101.220401, 2020/6/1

11.  "Nanometric square skyrmion lattice in a centrosymmetric tetragonal magnet",
    N. D. Khanh, T. Nakajima, X. Z. Yu, S. Gao, K. Shibata, M. Hirschberger, Y. Yamasaki, H. Sagayama, H. Nakao, L. C. Peng, K. Nakajima, R. Takagi, T. Arima, Y. Tokura and S. Seki,
    Nature Nanotecnology 15, 444–449(2020) ; 10.1038/s41565-020-0684-7, 2020/5/18

12. "Field-induced spin reorientation in an 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, 174411 (2020);  10.1103/PhysRevB.101.174411

13. "Determination of crystallographic chirality of MnSi thin film grown on Si (111) substrate",  
    Daisuke Morikawa, Y. Yamasaki, Naoya Kanazawa, Tomoyuki Yokouchi, Yoshinori Tokura, and Taka-hisa Arima,
    Phys. Rev. Materials 4, 014407 (2020), 10.1103/PhysRevMaterials.4.014407

Review Paper

1. Sparse Phase Retrieval Algorithm for Coherent X-ray Diffraction Imaging.
   Yuichi YAMASAKI （山崎裕一）
   Nihon Kessho Gakkaishi（日本結晶学会誌） 62 [1] (2020) 10-16 10.5940/jcrsj.62.10

Proceeding Paper

1. 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; 10.7566/JPSCP.30.011194

2019年以前の成果はこちら