Ishigami Keisuke

Research field (3)： Semiconductors, optical and atomic physics , Magnetism, superconductivity, and strongly correlated systems , Thin-film surfaces and interfaces

Research keywords (9)：酸化物薄膜 , 実験手法開発 , 実験装置開発 , 内殻X線吸収分光 , X線光電子分光 , 磁気円二色性 , 磁石 , 放射光実験 , 磁性

Papers (39)：

Keisuke Ishigami, Akihiro Yoshinari, Hiroki Iida, Hajime Nakamura, Tetsuya Nakamura, Satoshi Okamoto. Encompassing Investigation of the Correlation between Secondary Phase Formation, Heat Treatment and Coercivity for Nd-Fe-B Sintered Magnets by <i>in situ</i> High-Temperature Synchrotron X-ray Diffraction. MATERIALS TRANSACTIONS. 2025. 66. 11. 1419-1424
V. K. Verma, J. Patra, V. R. Singh, Y. Nonaka, G. Shibata, K. Ishigami, A. Tanaka, K. Ohgushi, Y. Tokura, T. Koide, et al. Orbital magnetic moments in FeCr2S4 studied by x-ray magnetic circular dichroism. Physical Review B. 2025
Ruixuan Ying, Takuya Taniguchi, Koki Nabeta, Keisuke Ishigami, Nobuaki Kikuchi, Satoshi Okamoto. Clustering First-order reversal curve diagram using the Gaussian mixture model and the Davies-Bouldin index. Japanese Journal of Applied Physics. 2024. 63. 11. 11SP04-11SP04
Tomomi Suwa, Keisuke Ishigami, Motohiro Suzuki, Satoshi Okamoto. Feature extraction and classification of microstructure and magnetic tomography images of an advanced Nd-Fe-B sintered magnet. Japanese Journal of Applied Physics. 2024. 63. 11. 117002-117002
Yutaka Matsuura, Keisuke Ishigami, Ryuji Tamura, Tetsuya Nakamura. Demagnetization processes of Nd-Fe-B sintered magnets and ferrite magnets as demonstrated by soft X-ray magnetic circular dichroism microscopy. Journal of Magnetism and Magnetic Materials. 2023. 579. 170854-170854

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MISC (11)：

Y. Matsuura, R. Tamura, K. Ishigami, T. Nakamura. Observation of magnetization reversal process for (Sm,Ce)2(Co,Fe,Cu,Zr)17 magnets by soft X-ray magnetic circular dichroism microscopy. SPring-8/SACLA Research Frontiers 2020. 2021. 56-57
G. Shibata, M. Kitamura, M. Minohara, K. Yoshimatsu, T. Kadono, K. Ishigami, T. Harano, Y. Takahashi, S. Sakamoto, Y. Nonaka, et al. Strain-Induced anisotropic spin-density distribution in La1-xSrxMnO3 thin films revealed by angle-dependent x-ray magnetic circular dichroism. Photon Factory News. 2018. 36. 3. 13-18
G. Shibata, M. Kitamura, M. Minohara, K. Yoshimatsu, T. Kadono, K. Ishigami, T. Harano, Y. Takahashi, S. Sakamoto, Y. Nonaka, et al. Strain-Induced Anisotropic Spin-Density Distribution in La1-xSrxMnO3 Thin Films Revealed by Angle-Dependent X-Ray Magnetic Circular Dichroism. Photon Factory Highlights 2017. 2018. 20-21
Shibata Goro, Fuchino Schuichiro, Okano Makoto, Fujihira Jun-ichi, Uchida Akira, Watanabe Kazunori, Fujihira Hideyuki, Fujihira Seiichi, Tanaka Arata, Kumigashira Hiroshi, et al. Magnetically-induced anisotropic charge distribution in La_1-xSr_xMnO₃ thin films revealed by x-ray magnetic linear dichroism. Meeting Abstracts of the Physical Society of Japan. 2018. 73. 0. 1538-1538
池田啓祐, 芝田悟朗, 関剛斎, 石上啓介, 堀尾眞史, 坂本祥哉, 野中洋亮, 酒巻真粧子, 雨宮健太, 河村直己, et al. X線磁気円二色性によるL1₀秩序型FePt薄膜の磁気異方性の研究. 応用物理学会春季学術講演会講演予稿集(CD-ROM). 2017. 64th

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Lectures and oral presentations (55)：

Feature extraction of FORC diagrams of Nd-Fe-B sintered magnets with different temperatures, Dy doping, and alignment
(2023)
Understanding the Coercivity of Ga-containing Nd-Fe-B Sintered Magnets from Feature Extraction and Selection of X-ray Diffraction Patterns via Dimension Reduction and Sparse Modeling
(REPM2023 2023)
Understanding the Coercivity of Ga-Containing Nd-Fe-B Sintered Magnets from Feature Extraction and Selection of X-Ray Diffraction Patterns via Dimension Reduction and Sparse Modeling
(2023 IEEE International Magnetic Conference (INTERMAG) 2023)
X線分光スペクトル計測の効率化に向けたデータ科学的アプローチ
(第76回SPring-8先端利用技術ワークショップ X線発光分光による電子状態研究の現状と将来展望 2022)
(Sm,Ce)2(Co,Fe,Cu,Zr)17磁石の保磁力配向度および角度依存性について
(日本金属学会2021年秋季大会 2021)

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Education (2)：

2007 - 2013 The University of Tokyo Graduate School of Frontier Sciences
2003 - 2007 Nagoya Institute of Technology

Professional career (2)：

博士(科学) (東京大学)
修士(科学) (東京大学)

Work history (8)：

2025/04 - 現在 Shin-Etsu Chemical Co., Ltd. Magnetic Materials Research Center
2022/11 - 2025/03 Tohoku University Institute of Multidisciplinary Research for Advanced Materials
2022/04 - 2022/10 Tohoku University Institute of Multidisciplinary Research for Advanced Materials
2019/04 - 2022/03 Japan Synchrotron Radiation Research Institute
2018/01 - 2019/04 Japan Synchrotron Radiation Research Institute

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Association Membership(s) (6)：

日本顕微鏡学会 , 日本磁気学会 , 日本金属学会 , 日本放射光学会 , 応用物理学会 , 日本物理学会

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