Kuwahara Hideki

(桑原英樹)

Profile Information

Affiliation: Professor, Faculty of Science and Technology, Department of Engineering and Applied Sciences, Sophia University

Degree: 博士（工学）(東京大学)

Contact information: h-kuwahasophia.ac.jp
Researcher number: 90306986
ORCID ID: https://orcid.org/0000-0001-9259-0500
J-GLOBAL ID: 200901077085152174
researchmap Member ID: 1000306055

(Subject of research)
Study on Electronic Properties of Transition Metol Oxides

Research Interests

Research Areas

Research History

Apr, 2007 - Present

Faculty of Science and Technology Department of Engineering and Applied Sciences, Sophia University
Apr, 2000 - Mar, 2007

Sophia University
Oct, 1998 - Sep, 2001

Japan Science and Technology Corporation
Apr, 1998 - Mar, 2000

Sophia University
Apr, 1987 - Mar, 1998

SANYO Electric CO.,LTD.

Education

Apr, 1990 - Mar, 1992

Graduate School, Division of Science and Engineering, University of Tsukuba

Papers

205

CE-Antiferromagnetic Electronic Structure in LaSr ₂ Mn ₂ O ₇ Revealed by Micro-focused Angle-resolved Photoemission Spectroscopy and Tight-binding Models

Yasutaka Sawata, Yudai Hirai, Rintaro Miyabayashi, Goro Shibata, Hideki Kuwahara, Miho Kitamura, Koji Horiba, Kenichi Ozawa, Noriaki Hamada, Tomohiko Saitoh

Journal of the Physical Society of Japan, 95(8) 084703-1-084703-7, Jul 7, 2026 Peer-reviewed
Incommensurate Antiferromagnetic Order in the Fe-substituted Bi-2201 Cuprate in the Heavily Overdoped Regime

Yota Komiyama, Yoichi Ikeda, Takanori Taniguchi, Travis J. Williams, Masaaki Matsuda, Shinichiro Asai, Takatsugu Masuda, Hideki Kuwahara, Haruhiko Kuroe, Takayuki Kawamata, Isao Watanabe, Masaki Fujita, Tadashi Adachi

Journal of the Physical Society of Japan, 95(7) 073701-1-073701-5, Jun 10, 2026 Peer-reviewed
Effect of Pb Substitution at the Mo Site on the Magnetic Properties of the Polar Magnet Fe ₂ Mo ₃ O ₈

Takumi Shirasaki, Taichi Ishikawa, Shungo Nakayama, Hideki Kuwahara

IEEE Transactions on Magnetics, 1-1, Apr 20, 2026 Peer-reviewedLast authorCorresponding author
Effect of Pb Substitution at the Mo Site on the Magnetic Properties of the Polar Magnet Fe ₂ Mo ₃ O ₈

Taichi Ishikawa, Shungo Nakayama, Takumi Shirasaki, Hideki Kuwahara

2026 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers), 1-2, Apr 13, 2026 Last authorCorresponding author
Anisotropic Magnetism and Magnetoelectric Coupling in Polar Cluster Magnets Ba₆Ln₂Fe₄O₁₅ (Ln=La, Pr, Nd)

Takumi Shirasaki, Taichi Ishikawa, Hideki Kuwahara

2026 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers), 1-2, Apr 13, 2026 Last authorCorresponding author

Misc.

353

Soft x-ray angle-resolved photoemission spectroscopy of the half-doped bilayer manganite in the A-type antiferromagnetic state

Yasutaka Sawata, Kohei Yamagami, Goro Shibata, Hideki Kuwahara, Noriaki Hamada, Tomohiko Saitoh

Program and Abstracts of the 81st Annual Meeting of the Physical Society of Japan (2026), 17aA105-14, Sep 7, 2026
Hydrogen-Induced Change of Electronic State in Perovskite LaNiO₃

Yuichiro Kishizaki, Kosei Fujiwara, Haruto Kubota, Hideki Kuwahara, Kenji Ishii, Takuya Tsuji, Daiju Matsumura, Tadashi Adachi

Program and Abstracts of the 81st Annual Meeting of the Physical Society of Japan (2026), 14pA166-14, Sep 7, 2026
Element-Substitution Effects on Cluster Magnetism in the Novel Multiferroic Material Ba₆Pr₂Fe₄O₁₅

Takumi Shirasaki, Taro Mitsuzawa, Taichi Ishikawa, Hideki Kuwahara

Program and Abstracts of the 81st Annual Meeting of the Physical Society of Japan (2026), 14pA104-03, Sep 7, 2026
The effect of elemental substitution on the thermoelectric properties of Fe₃O₄

Yuito Kihara, Raito Akune, Ryoma Imamura, Kyousuke Sato, Taichi Ishikawa, Takumi Shirasaki, Hideki Kuwahara, Tetsuji Okuda

Program and Abstracts of the 81st Annual Meeting of the Physical Society of Japan (2026), 17aPS-12, Sep 7, 2026
Magnetic Properties of Spin-Trimer System Fe₂(Mo_1-xA_x)₃O₈(A = Zr, W)

Taichi Ishikawa, Takumi Shirasaki, Shungo Nakayama, Hideki Kuwahara

81st Annual Meeting(2026), The Physical Society of Japan, 15aPS-50, Sep 7, 2026
Magnetic and Magnetoelectric Properties of Mo-Site Impurity-Substituted Zn₂Mo₃O₈

Taichi Ishikawa, Takumi Shirasaki, Shungo Nakayama, Hideki Kuwahara

Extended Abstracts of the 87th JSAP Autumn Meeting, 2026, 8p-E217-5, Aug 26, 2026
Changes in Radiation Characteristics by Controlling the Composition of SRD

K. Kawashima, Takumi Shirasaki, Sumitaka Tachikawa, Hideki Kuwahara, Tomohiko Saitoh

Extended Abstracts of the 87th JSAP Autumn Meeting, 2026, 8a-E217-3, Aug 26, 2026
Modulation of Fe₄O₁₅ Cluster Magnetism by Element Substitution in Ba₆La₂Fe₄O₁₅

Takumi Shirasaki, Taro Mitsuzawa, Taichi Ishikawa, Hideki Kuwahara

Extended Abstracts of the 87th JSAP Autumn Meeting, 2026, 8p-E217-4, Aug 26, 2026
Photocatalytic Effects of a Titanium Dioxide / Calcium Phosphate Hybridized Sheet

Shohei Kajiwara, Kiyoshi Itatani, Hideki Kuwahara, Takeshi Toyama, Taishi Yokoi, Tetsuo Sasaki, Haruhiko Kuroe

Extended Abstracts of the 87th JSAP Autumn Meeting, 2026, 10p-PB1-15, Aug 26, 2026
Photocatalytic Activity of Composite Sheet Fabricated from Fibrous Octacalcium Phosphate/Titanium Dioxide

Shohei Kajiwara, Kiyoshi Itatani, Hideki Kuwahara, Takeshi Toyama, Ian Davies, Haruhiko Kuroe

The 12th International Symposium on Inorganic Phosphate Materials (ISIPM-12), Abstracts, O-EEM_2-04, Aug, 2026
Magnetism of Mo-Site Impurity-Substituted Zn₂Mo₃O₈

Taichi Ishikawa, Takumi Shirasaki, Hideki Kuwahara

Program and Abstracts of the 2026 Spring Meeting of the Physical Society of Japan, 23pPSH-11, Mar 9, 2026
Magnetoelectric Properties of Ba₆Ln₂Fe₄O₁₅ (Ln = La, Pr, Nd) with Coexisting Polar Structure and Magnetic Clusters

Takumi Shirasaki, Taichi Ishikawa, Hideki Kuwahara

Program and Abstracts of the 2026 Spring Meeting of the Physical Society of Japan, 23pPSH-08, Mar 9, 2026
Hydrogen-Induced Carrier Doping and Reduction Effects in Perovskite LaNiO₃

Yuichiro Kishizaki, Kosei Fujiwara, Haruto Kubota, Hideki Kuwahara, Tadashi Adachi

Program and Abstracts of the 2026 Spring Meeting of the Physical Society of Japan, 26aH1-12, Mar 9, 2026
Magnetoelectric Properties of the Polar Magnets Ba₆Ln₂Fe₄O₁₅ (Ln = Lanthanoid)

Takumi Shirasaki, Taichi Ishikawa, Hideki Kuwahara

Extended Abstracts of the 73rd JSAP Spring Meeting, 2026, 17p-S4_202-11, Mar 4, 2026
X-ray Absorption Fine Structure Study of Oxidation / Reduction Effects and the Electronic State of the Infinite-Layer Cuprate Thin Films of (Ca_0.85Sr_0.15)_1-xLa_xCuO₂

Tomoya Shimada, Motoki Hayashi, Riku Kagawa, Hirotaka Okabe, Jumpei G. Nakamura, Hideki Kuwahara, Ryosuke Kadono, Kenji Ishii, Takuya Tsuji, Daiju Matsumura, Masaki Fujita, Tadashi Adachi

Extended Abstracts of the 73rd JSAP Spring Meeting, 2026, 15p-W9_325-5, Mar 4, 2026
The band structure of the CE-type antiferromagnetic state in a LaSr₂MnO₇

Yasutaka Sawata, Goro Shibata, Hideki Kuwahara, Kenichi Ozawa, Hironori Nakao, Noriaki Hamada, Tomohiko Saitoh

Abstracts of the Quantum Beam Science Festa FY2025, B503, Mar, 2026
Enhancement of Spin Fluctuations in Perovskite Nickelate LaNiO₃

Tadashi Adachi, Kosei Fujiwara, Hiyori Tatezumi, Yuichiro Kishizaki, Yota Komiyama, Hideki Kuwahara, Haruhiko Kuroe, Isao Watanabe, Tomohisa Takamatsu, Koji Yokoyama, Jumpei G. Nakamura, Akihiro Koda, Kenji Ishii, Takuya Tsuji, Daiju Matsumura

Abstracts of the Quantum Beam Science Festa FY2025, B014, Mar, 2026
Oxygen Doping Effects in Iron-Chalcogenide FeTe_1-xS_x Thin Films

Kazuki Miwa, Hayato Oki, Hirotaka Okabe, Jumpei G. Nakamura, Hideki Kuwahara, Ryosuke Kadono, Tadashi Adachi

Materials Research Meeting 2025 (MRM2025), Abstracts, A4-O501-08, Dec 1, 2025
Hall number in the Electron-Doped T'-cuprate Pr_1–xLaCe_xCuO₄

Ikuya Maetsu, Yota Komiyama, Kaname Moriya, Hideki Kuwahara, Haruhiko Kuroe, Satoshi Awaji, Tatsunori Okada, Tadashi Adachi

Materials Research Meeting 2025 (MRM2025), Abstracts, A4-O501-05, Dec 1, 2025
Strain Effects on the Electronic State in the Bilayer Nickelate Thin Film of La₃Ni₂O_7-δ

Kota Morita, Hirotaka Okabe, Jumpei G. Nakamura, Hideki Kuwahara, Ryosuke Kadono, Tadashi Adachi

Materials Research Meeting 2025 (MRM2025), Abstracts, A4-O301-04, Dec 1, 2025
Enhancement of Spin Fluctuations in Perovskite Nickelate LaNiO₃

Kosei Fujiwara, Hiyori Tatezumi, Yuichiro Kishizaki, Hideki Kuwahara, Haruhiko Kuroe, Tomohisa Takamatsu, Koji Yokoyama, Isao Watanabe, Kenji Ishii, Takuya Tsuji, Daiju Matsumura, Tadashi Adachi

Materials Research Meeting 2025 (MRM2025), Abstracts, A4-O301-03, Dec 1, 2025
Development of Spin Correlation in the Electron-Doped High-T_c Cuprate Thin Films of La_2-xCe_xCuO₄ in the Heavily Overdoped Regime

SangEun Park, Andreas Suter, Hirotaka Okabe, Jumpei G. Nakamura, Hideki Kuwahara, Zaher Salman, Thomas Prokscha, Ryosuke Kadono, Tadashi Adachi

Materials Research Meeting 2025 (MRM2025), Abstracts, A4-O301-02, Dec 1, 2025
Synthesis of the Bulk Nickelates of Perovskite La_1-xCa_xNiO₃ and Infinite-Layer La_1-xCa_xNiO₂

Tomoya Oishi, Hiyori Tatezumi, Hideki Kuwahara, Haruhiko Kuroe, Tomohisa Takamatsu, Tadashi Adachi

Materials Research Meeting 2025 (MRM2025), Abstracts, A4-O101-08, Dec 1, 2025
Crystal Growth and Magnetic Properties of Cluster Magnets Ba₆(La, Pr)₂Fe₄O₁₅

Takumi Shirasaki, Taichi Ishikawa, Hideki Kuwahara

Abstracts of the High Magnetic Field Science Workshop and the 20th High Magnetic Field Forum, P-12, Nov, 2025
Study on Improvement of the Radiative Performance of a Variable Emittance Radiator ("SRD") Using Dielectric Multilayer Films - Enhancement of High-to-Low Temperature Emissivity Ratio

Ryo Takagi, Sumitaka Tachikawa, Hideki Kuwahara, Tomohiko Saitoh

Proceedings of the 46th Japan Symposium on Thermophysical Properties, B131, Oct, 2025
Impurity-Substitution Effects in the Polar Cluster Magnet Ba₆La₂Fe₄O₁₅

Takumi Shirasaki, Taichi Ishikawa, Hideki Kuwahara

Program and Abstracts of the 80th Annual Meeting of the Physical Society of Japan (2025), 18aPS-27, Sep 8, 2025
Hall Number in the Electron-Doped Cuprate Superconductor Pr₁₋ₓLaCeₓCuO₄

Ikuya Maetsu, Yota Komiyama, Kaname Moriya, Hideki Kuwahara, Haruhiko Kuroe, Tatsunori Okada, Satoshi Awaji, Tadashi Adachi

Program and Abstracts of the 80th Annual Meeting of the Physical Society of Japan (2025), 17pSK311-04, Sep 8, 2025
Development of Spin Correlation in the Heavily Overdoped Regime of Electron-Doped Cuprate La₂₋ₓCeₓCuO₄ Thin Films

SangEun Park, Andreas Suter, Hirotaka Okabe, Jumpei G. Nakamura, Hideki Kuwahara, Zaher Salman, Thomas Prokscha, Ryosuke Kadono, Tadashi Adachi

Program and Abstracts of the 80th Annual Meeting of the Physical Society of Japan (2025), 17pSK311-03, Sep 8, 2025
Enhancement of Spin Fluctuations in Perovskite Nickelate LaNiO₃

Kosei Fujiwara, Hiyori Tatezumi, Yuichiro Kishizaki, Yota Komiyama, Hideki Kuwahara, Haruhiko Kuroe, Isao Watanabe, Tomohisa Takamatsu, Koji Yokoyama, Jumpei G. Nakamura, Akihiro Koda, Kenji Ishii, Takuya Tsuji, Daiju Matsumura, Tadashi Adachi

Program and Abstracts of the 80th Annual Meeting of the Physical Society of Japan (2025), 16aSK313-05, Sep 8, 2025
Magnetic and transport properties of element-substituted Fe₃O₄

Seiu Takeda, Yuito Kihara, Raito Akune, Kyosuke Sato, Taichi Ishikawa, Takumi Shirasaki, Hideki Kuwahara, Tetsuji Okuda

Program and Abstracts of the 80th Annual Meeting of the Physical Society of Japan (2025), 16aSK108-03, Sep 8, 2025
Epitaxial-Strain Dependence of the Electronic State in Bilayer Nickelate La₃₋ₓPrₓNi₂O₇₋δ Thin Films

Kota Morita, Hirotaka Okabe, Jumpei G. Nakamura, Hideki Kuwahara, Ryosuke Kadono, Tadashi Adachi

Extended Abstracts of the 86th JSAP Autumn Meeting, 2025, 8p-N404-8, Aug 26, 2025
Magnetic Properties in Polar Magnets Ba₆La₂M₄O₁₅ (M = Fe, Co)

Takumi Shirasaki, Taichi Ishikawa, Hideki Kuwahara

Conference on Strongly Correlated Electron Systems 2025 (SCES 2025), Program with abstracts, 66, Jul, 2025
Phase separation in the bilayer manganite studied by scanning-type resonant soft X-ray scattering

Hironori NAKAO, Yasutaka Sawata, Masaichiro MIZUMAKI, Yuichi YAMASAKI, Hideki KUWAHARA, Tomohiko SAITOH

Photon Factory Activity Report 2024 #42 (2025), Jun, 2025
Controlling the radiation characteristics of a variable emittance radiator (“SRD”) using dielectric multilayer films

Ryo Takagi, Sumitaka Tachikawa, Hideki Kuwahara, Tomohiko Saitoh

Proceedings of the 62nd National Heat Transfer Symposium of Japan, OS3-01, May, 2025
Phase-separated state in the bilayer manganite investigated by scanning-type resonant soft X-ray scattering

H Nakao, Y Sawata, M Mizumaki, Y Yamasaki, H Kuwahara, T Saitoh

Journal of Physics: Conference Series, 3010(1) 012159-012159, May 1, 2025 Peer-reviewed

Abstract Phase separation between the CE-type charge-orbital ordered (CE) phase and the A-type antiferromagnetic ordered (A-AF) phase has been investigated in the bilayer manganite, La_2-2xSr_1+2xMn₂O₇ (x = 0.51), by resonant soft X-ray scattering (RSXS) at the Mn L _2,3 edge. The order parameters of CE and A-AF phases were measured at 1/4 1/4 0 and 0 0 1 reflections, respectively, and the phase separation was observed at the intermediate temperature region. Using a scanning-type RSXS with an X-ray focused by a Fresnel zone plate, the real-space images of domains for both the competing CE-phase and A-AF-phase were successfully observed. In the phase-separated state, we revealed that the domain of the CE phase forms a stripe pattern, and it seems to originate from the inhomogeneity of the chemical composition on sample.
Seeking CE-type antiferromagnetic state in competition with A-type antiferromagnetic state in a layered manganese oxide LaSr₂Mn₂O₇

Yasutaka Sawata, Goro Shibata, Hideki Kuwahara, Kenichi Ozawa, Hironori Nakao, Noriaki Hamada, Tomohiko Saitoh

OPTICS & PHOTONICS International Congress 2025 (OPIC2025), Conference Program, 127, Apr, 2025
Mg and Al Substitution Effects on the Physical Properties of Fe₃O₄

Seiu Takeda, Yuito Kihara, Kyosuke Sato, Taichi Ishikawa, Hideki Kuwahara, Tetsuji Okuda

The 23rd Korea-Taiwan-Japan Symposium on Strongly Correlated Electron System (KTJ23), Abstract book, 35, Mar, 2025
Spin Correlation in the Electron-Doped High-T_c Cuprate Thin Films of La_2-xCe_xCuO₄

SangEun Park, Andreas Suter, Hirotaka Okabe, Jumpei G Nakamura, Hideki Kuwahara, Zaher Salman, Thomas Prokscha, Ryosuke Kadono, Tadashi Adachi

Bulletin of the American Physical Society, APS Global Physics Summit 2025, MAR-G23.3, Mar, 2025
Hole concentration dependence of spin fluctuations enhanced by Fe impurity in overdoped / heavily overdoped Bi-2201 cuprates

Yota Komiyama, Kazuki Miwa, Akihiro Koda, Jumpei G. Nakamura, Yoichi Ikeda, Takanori Taniguchi, Takatsugu Masuda, Tao Hong, Masaaki Matsuda, Hideki Kuwahara, Haruhiko Kuroe, Dita Puspita Sari, Isao Watanabe, Masaki Fujita, Tadashi Adachi

Abstracts of the Quantum Beam Science Festa FY2024, 020B, Mar, 2025
Spin Fluctuations in the Overdoped Regime of Electron-Doped High-T_c Cuprate Thin Films

SangEun Park, Andreas Suter, Hirotaka Okabe, Jumpei G. Nakamura, Hideki Kuwahara, Zaher Salman, Thomas Prokscha, Ryosuke Kadono, Tadashi Adachi

Abstracts of the Quantum Beam Science Festa FY2024, 018B, Mar, 2025
Seeking CE-type antiferromagnetic state in competition with A-type antiferromagnetic state in a bi-layered manganese oxide LaSr₂Mn₂O₇

Yasutaka Sawata, Goro Shibata, Hideki Kuwahara, Kenichi Ozawa, Hironori Nakao, Noriaki Hamada, Tomohiko Saitoh

Abstracts of the Quantum Beam Science Festa FY2024, 012B, Mar, 2025
Phase separation in the bilayer manganite studied by scanning-type resonant soft X-ray scattering

Hironori Nakao, Yasutaka Sawata, Masaichiro Mizumaki, Yuichi Yamasaki, Hideki Kuwahara, Tomohiko Saitoh

Abstracts of the Quantum Beam Science Festa FY2024, 025B, Mar, 2025
PLD 法によるLa3Ni2O7薄膜の作製とエピタキシャル歪み効果

森田航太, 岡部博幸, 中村惇平, 桑原英樹, 門野良典, 足立匡

2025年第72回応用物理学会春季学術講演会, [14p-K206-8], Mar, 2025
Fabrication of Fibrous Calcium Phosphate Composite Sheets with Homogeneously Dispersed Titanium Dioxide Nanoparticles

Shohei Kajiwara, Kiyoshi Itatani, Hideki Kuwahara, Takeshi Toyama, Taishi Yokoi, Tetsuo Sasaki, Haruhiko Kuroe

Abstracts of the 2025 Annual Meeting of the Ceramic Society of Japan, 3J12, Feb 26, 2025
Nd:YAGレーザーを用いたPLD 法によるニッケル酸化物薄膜の作製とトポケミカル還元効果

森田航太, 山下琉斗, 土橋礼奈, 岡部博幸, 中村惇平, 桑原英樹, 門野良典, 足立匡

第85回応用物理学会秋季学術講演会講演予稿集, Sep 4, 2024
酸化チタンナノ粒子と繊維状リン酸カルシウムの複合シートの作製

梶原奨平, 板谷清司, 桑原英樹, 遠山岳史, 横井太史, 佐々木哲朗, 黒江晴彦

第85回応用物理学会秋季学術講演会講演予稿集, Sep 4, 2024
低ドープ域で組成制御した放射率可変素子(SRD)の電気抵抗率評価

佐藤京介, 太刀川純孝, 齋藤智彦, 桑原英樹

第85回応用物理学会秋季学術講演会講演予稿集, Sep 4, 2024 Corresponding author
Enhancing the Magnetoelectric Features of CaBaCo4O7 Crystals through Impurity Doping

H. Kuwahara, H. Arai, T. Shirasaki, H. Kuroe, M. Akaki

Taiwan Symposium on Strongly Correlated Electron Systems (JKT22) Abstract book, 46, Mar 15, 2024 Lead authorCorresponding author
光触媒機能の向上を目指した相制御酸化チタンナノ粒子の調製と評価

梶原奨平, 梶原奨平, 板谷清司, 桑原英樹, 遠山岳史, 横井太史, 佐々木哲朗, 黒江晴彦

日本セラミックス協会年会講演予稿集(Web), 2024 ROMBUNNO.3F08 (WEB ONLY), Mar, 2024
Hole concentration dependence of spin fluctuations enhanced by Fe impurity in overdoped / heavily overdoped Bi-2201 cuprates

小宮山陽太, 小宮山陽太, 三輪和樹, 桑原英樹, 黒江晴彦, 幸田章宏, 中村惇平, 川股隆行, SARI Dita Puspita, SARI Dita Puspita, 渡邊功雄, 足立匡

日本物理学会講演概要集(CD-ROM), 79(2), 2024

Books and Other Publications

『電子スピンを見る操る』(アトムテクノロジーへの挑戦 : ナノテクノロジーの最前線 / 田中一宜監修, 2)「電子集団の七変化－コロサル磁気抵抗」

桑原英樹 (Role: Joint author, 113-143)

日経BP社, Nov, 2001 (ISBN: 4822205819)
Physics of manganites(Fundamental materials research)「Metal-Insulator Phenomena Relevant to Charge/Orbital Ordering in Perovskite Manganites」

Kuwahara Hideki (Role: Joint author, 155-175)

Kluwer Academic/Plenum, 1999 (ISBN: 0306461323)
Colossal magnetoresistance, charge ordering and related properties of manganese oxides「First-order insulator-metal transitions in perovskite manganites with charge-ordering instability」

Kuwahara Hideki (Role: Joint author)

World Scientific, 1998 (ISBN: 9810232764)
Perovskite-type Manganites and Colossal Magnetoresistance

Kuwahara Hideki (Role: Joint author)

Sep 16, 1996

Presentations

425

Effects of Mo-Site Impurity Doping on Magnetic and Magnetoelectric Properties in M₂Mo₃O₈

Taichi Ishikawa, Takumi Shirasaki, Shungo Nakayama, Hideki Kuwahara

71st Annual Conference on Magnetism and Magnetic Materials (MMM 2026), AIP Publishing; IEEE Magnetics Society

Presentation number: GQ14
Synthesis, Magnetism, and Magnetoelectric Properties of Polar Cluster Cobaltite Ba₆La₂Co₄O₁₅

Takumi Shirasaki, Taichi Ishikawa, Hideki Kuwahara

71st Annual Conference on Magnetism and Magnetic Materials (MMM 2026), AIP Publishing; IEEE Magnetics Society
Magnetic and Magnetoelectric Properties of Fluorite-Related Polar Magnets Ln₃RuO₇ (Ln = Sm, Eu, Gd)

Takumi Shirasaki, Taichi Ishikawa, Hideki Kuwahara

71st Annual Conference on Magnetism and Magnetic Materials (MMM 2026), AIP Publishing; IEEE Magnetics Society
Oxygen Doping Effects in Iron-Chalcogenide FeTe₁₋ₓSₓ Thin Films

Tadashi Adachi, Kazuki Miwa, Hayato Oki, Hirotaka Okabe, Jumpei G. Nakamura, Hideki Kuwahara, Ryosuke Kadono

International Conference on Strongly Correlated Electron Systems 2026 (SCES 2026), Oct 1, 2026

Presentation number: Th-3FN-06
Electronic structure of LaSr₂Mn₂O₇ in the A-type antiferromagnetic phase studied by soft X-ray ARPES and first-principles calculations

Yasutaka Sawata, Kohei Yamagami, Goro Shibata, Hideki Kuwahara, Noriaki Hamada, Tomohiko Saitoh

International Conference on Strongly Correlated Electron Systems 2026 (SCES 2026), Oct 1, 2026

Presentation number: Th-3FN-01

Professional Memberships

Research Projects

パルス超強磁場・量子ビーム・理論計算の融合による強相関ニッケル酸化物の多機能性開拓

2026年度上智大学学術研究特別推進費「自由課題研究」, 上智大学, Aug, 2026 - Mar, 2029

桑原英樹, 足立匡, 酒井志朗
Decoupling Static and Dynamic Effects and Elucidating the Origin of Nonreciprocal Responses in Polar and Nonpolar Multiferroics

Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2026 - Mar, 2029
軌道分子相関を有する強相関電子系物質における新規物性探索

科学研究費助成事業, 日本学術振興会, Apr, 2024 - Mar, 2027

奥田哲治, 齋藤智彦, 梶本亮一, 桑原英樹
巨大電気磁気効果を拓く革新的マルチフェロイック材料の創出と機構解明

2026年度理工学部申請型（応募制）研究費, 上智大学, Jun, 2026 - Mar, 2027

桑原英樹
パルス超強磁場を用いた革新的磁気機能性材料の創製

2023年度上智大学学術研究特別推進費「自由課題研究」, 上智大学, Aug, 2023 - Mar, 2026

桑原英樹, 足立匡, 赤木暢

Industrial Property Rights

5957195 磁性イオンを含むオケルマナイト構造を有する電気磁気効果材料を用いた電気磁気効果素子

桑原英樹, 赤木暢
5702084 ペロブスカイト型Mn酸化物および巨大磁気抵抗素子

桑原英樹, 赤星大介
3694762 光メモリー材料

桑原英樹, 十倉好紀, 富岡泰秀, 朝光敦, 守友浩
3030333 電流および電場誘起相転移を用いたスイッチング素子及びメモリー素子

朝光敦, 富岡泰秀, 桑原英樹, 十倉好紀
2961149 層構造マンガン酸化物系単結晶体およびその製造方法

守友浩, 朝光敦, 桑原英樹, 十倉好紀

Other

（教育実績）宿題の添削、学生の発表等による授業の活性化

Apr, 2008

基礎物理学実験・演習では、実際に自分の力で演習問題を解けるようにと、実践的な演習問題解答を毎回提出させ、添削している。また学生による答案発表も授業で取り入れ、積極的な授業への参加を進めている。
（教育実績）情報機器の利用

Apr, 2003

数年前から教育活動にインターネットを活用している。資料や論文をサイトからダウンロードできるようにしている。ゼミや卒業研究指導にはパスワードによって外部者の閲覧を排除した掲示板を設置し、学生から研究進捗状況の報告を受けたり、それに対する指導を書き込んだりすることによって、ゼミ学生全体への情報交換ができるシステムを構築している。また、修士論文や原著論文、研究内容をＰＤＦ化しサイト上で公開している。
（教育実績）電子メディアの活用と実践

Apr, 2003

あらゆる教育活動においてコンピュータ活用を積極的に進めている。具体的には電子メールによる研究ディスカッションや、研究結果を電子ファイルにまとめて提出させるなど行っている。ゼミ学生のパソコン所有率は100％であり、多くの研究報告が電子情報化され、活用されている。また、研究発表の為にプレゼンテーションソフトを上手に使いこなせるように資料の作成方法や発表方法を指導している。
（教育実績）コンピュータの積極的利用

Apr, 2003

コンピュータおよびネットワークを教育に活用すべく努力している。また、技術進歩の著しい分野の講義では、最新の研究やトピックも授業で積極的に紹介するようにしている。紹介にはプレゼンテーションソフトやビデオなどのマルチメディアを活用して、直感的に分かりやすく印象に残るように工夫している。また、学生への連絡、学生からの質問に電子メールを活用している。
（教育実績）授業の工夫

Apr, 2003

ゼミでは、将来の研究発表等に活かせるように、プレゼンテーションの機会を多く与え、またプレゼンテーション担当者以外のゼミ生にも必ず質問させるようにして、形式にとらわれず活発な議論を展開できるように指導している。

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