大河内 拓雄(Takuo Ohkochi)



メール: o-taku@spring8.or.jp



  • 光電子顕微鏡
  • ナノ顕微分光
  • 磁区構造解析
  • 時間分解計測


  • A. Yamaguchi, A. Nakao, T. Ohkochi, A. Yasui, T. Kinoshita, Y. Utsumi, T. Saiki, and K. Yamada: “Ferromagnetic resonance of Ni wires fabricated on ferroelectric LiNbO3 substrate for studying magnetic anisotropy induced by the heterojunction” AIP Adv. 8, 056411 (2018).
  • A. Yamaguchi, T. Ohkochi, A. Yasui, T. Kinoshita, and K. Yamada: “Heterojunction-induced magnetic anisotropy and magnetization reversal of Ni wires on LiNbO3 substrate” J. Magn. Magn. Mater. 453 107 (2018).
  • A. Yoshigoe, H. Shiwaku, T. Kobayashi, I. Shimoyama, D. Matsumura, T. Tsuji, Y. Nishihata, T. Kogure, T. Ohkochi A. Yasui, and T. Yaita: ”Nanoscale spatial analysis of clay minerals containing cesium by synchrotron radiation photoemission electron microscopy” Appl. Phys. Lett. 112, 021603 (2018).
  • A. Yamaguchi, T. Ohkochi, A. Yasui, T. Kinoshita, K. Yamada: ” Control of Domain Structure in Artificial Ni Wires Fabricated on an LiNbO3 Substrate” 53, 2700487 (2017).
  • H. Osawa, T. Ohkochi, M. Fujisawa, S. Kimura, and T. Kinoshita: “Development of optical choppers for time-resolved measurements at soft X-ray synchrotron radiation beamlines” J. Synchrotron Rad. 24, 560 (2017).
  • T. Ohkochi, H. Fujiwara, M. Kotsugi, H. Takahashi, R. Adam, A. Sekiyama, T. Nakamura, A. Tsukamoto, C. M. Schneider, H. Kuroda, E. F. Arguelles, M. Sakaue, H. Kasai, M. Tsunoda, S. Suga, and T. Kinoshita: “Optical control of magnetization dynamics in Gd–Fe–Co films with different compositions” Appl. Phys. Exp. 10, 103002 (2017).
  • T. Muro, T. Ohkochi, Y. Kato, Y. Izumi, S. Fukami, H. Fujiwara, and T. Matsushita: ”Wide-angle display-type retarding field analyzer with high energy and angular resolutions” Rev. Sci. Instrum. 88, 123106 (2017).
  • J. S. Lim, J. H. Lee, A. Ikeda-Ohno, T. Ohkochi, K. -S. Kim, J. Seidel, and C. -H. Yang: “Electric-field-induced insulator to Coulomb glass transition via oxygen-vacancy migration in Ca-doped BiFeO3” Phys. Rev. B 94, 035123 (2016).
  • M. Hasegawa, K. Tashima, M. Kotsugi, T. Ohkochi, M. Suemitsu, and H. Fukidome: “Inhomogeneous longitudinal distribution of Ni atoms on graphene induced by layer-number-dependent internal diffusion” Appl. Phys. Lett. 109, 111604 (2016).
  • A. Yamaguchi, H. Hata, M. Goto, M. Kodama, Y. Kasatani, K. Sekiguchi, Y. Nozaki, T. Ohkochi, M. Kotsugi and T. Kinoshita: “Real-space observation of magnetic vortex core gyration in a magnetic disc both with and without a pair tag” Jpn. J. Appl. Phys. 55 (2016) 023002.
  • 大河内拓雄 「放射光光電子顕微鏡で視る磁気情報とダイナミクス」 日本磁気学会研究会資料 210, 11 (2016).
  • S. -I. Fujimori, T. Ohkochi, I. Kawasaki, A. Yasui, Y. Takeda, T. Okane, Y. Saitoh, A. Fujimori, H. Yamagami, Y. Haga, E. Yamamoto, and Y. Ōnuki: ”Electronic structures of ferromagnetic superconductors UGe2 and UCoGe studied by angle-resolved photoelectron spectroscopy” Phys. Rev. B 91, 174503 (2015).
  • H. Kubo, N. Nakamura, M. Kotsugi, T. Ohkochi, K. Terada and K. Fukuda: “Striped domains of coarse-grained magnetite observed by X-ray photoemission electron microscopy as a source of the high remanence of granites in the Vredefort dome” Front. Earth Sci. 3, 31 (2015).
  • S. Hu, Z. Yue, J. S. Lim, S. J. Callori, J. Bertinshaw, A. Ikeda-Ohno T. Ohkochi, C.-H. Yang, X. Wang, C. Ulrich and J. Seidel: “Growth and Properties of Fully Strained SrCoOx (x ≈ 2.8) Thin Films on DyScO3” Adv. Mater. Interfaces 2, 1500012 (2015).
  • K. Iwata, M. Suzuki, M. Hashimoto, M. Ueda, Y. Matuoka, T. Yasue, T. Koshikawa, M. Kotsugi, T. Ohkochi, T. Kinoshita, Y. Watanabe, K. Ishiyama: ”Temperature Dependence of Lancet Domains in Grain-Oriented Fe-3%Si Steels” IEEE Trans. Mag. 51, 2002504 (2015).
  • K. Kawano, M. Kotsugi, T. Ohkochi: “Microstructure effect on magnetization and domain structure in Ni0.49Zn0.49Co0.02Fe1.90Ox ferrite” J. Magn. Magn. Matt. 361, 57 (2014).
  • H. Fukidome, M. Kotsugi, K. Nagashio, R. Sato, T. Ohkochi, T. Itoh, A. Toriumi, M. Suemitsu and T. Kinoshita: “Orbital-specific Tunability of Many-Body Effects in Bilayer Graphene by Gate Bias and Metal Contact” Scientific Reports 4, 3713 (2014).
  • H. Tanigawa, T. Suzuki, K. Suemitsu, N. Ohshima, T. Kitamura, T. Ohkochi, M. Kotsugi, T. Kinoshita, T. Koyama, D. Chiba: “Operating principle of three-terminal domain wall device with perpendicularly magnetized Ta / CoFeB / MgO free layer and underlying hard magnets” J. J. Appl. Phys. 53, 063002 (2014).
  • S. Lee, K. Edalati, H. Iwaoka, Z. Horita, T. Ohtsuki, T. Ohkochi, M. Kotsugi, T. Kojima, M.Mizuguchi and K. Takanashi: “Formation of FeNi with L10-ordered structure using high-pressure torsion” Philosophical Magazine Letters. 94, 639 (2014).
  • H. Fukidome, T. Ide, Y. Kawai, T. Shinohara, N. Nagamura, K. Horiba, M. Kotsugi, T. Ohkochi, T. Kinoshita, H. Kumighashira, M. Oshima and M. Suemitsu: “Microscopically-Tuned Band Structure of Epitaxial Graphene through Interface and Stacking Variations Using Si Substrate Microfabrication” Scientific Reports 4, 5173 (2014).
  • K. Iwata, K. Ishiyama, M. Suzuki, M. Hashimoto, M. Ueda, Y. Matuoka, T. Yasue, T. Koshikawa, M. Kotsugi, T. Ohkochi, T. Kinoshita, Y. Watanabe” Quantitative Analysis of 90° Closure Domains Occurring by Compressive Stress in Fe3%Si(110) Steels” IEEE Trans. Mag. 50, 2007004 (2014).
  • T. Ohkochi, M. Kotsugi, K. Yamada, K. Kawano, K. Horiba, F. Kitajima, M. Oura, S. Shiraki, T. Hitosugi, M. Oshima, T. Ono, T. Kinoshita, T. Muro, Y. Watanabe, J. “Capability of insulator study by photoemission electron microscopy at SPring-8” J. Synchrotron Rad. 20, 620 (2013).
  • 大河内拓雄 「絶縁性試料の光電子顕微鏡(PEEM)観測」 表面化学(日本表面学会誌)34, 586 (2013).
  • 大河内拓雄 「時分割光電子顕微鏡(TR-PEEM)によるスピンダイナミクス観測の進展」 放射光(日本放射光学会誌) 26, 276 (2013).
  • S. Uegaki, T. Ohkochi, K. Kodama, N. Hosoito: “Depth profile of induced magnetic polarization in Au layers of Fe/Au(001) metallic superlattice by resonant X-ray magnetic scattering at high angle region” J. Phys. Soc. Jpn 82, 024711 (2013).
  • T. Kinoshita, K. Arai, K. Fukumoto, T. Ohkochi, M. Kotsugi, F. Guo, T. Muro, T. Nakamura, H. Osawa, T. Matsushita, T. Okuda: “Observation of micro-magnetic structures by synchrotron radiation photoelectron emission microscopy” J. Phys. Soc. Jpn. 82, 021005 (2013).
  • M. Kotsugi, M. Mizuguchi, S. Sekiya, M. Mizumaki, T. Kojima, T. Nakamura, H. Osawa, K. Kodama, T. Ohtsuki, T. Ohkochi, K. Takanashi, Y. Watanabe: “Origin of strong magnetic anisotropy in L10-FeNi probed by angular-dependent magnetic circular dichroism” J. Magn. Magn. Mater. 326, 235 (2013).
  • T. Ohkochi, A. Yamaguchi, M. Kotsugi, H. Hata, M. Goto, Y. Nozaki, T. Nakamura, H. Osawa, T. Kinoshita: “Progress in time-resolved photoemission electron microscopy at BL25SU, SPring-8: Radiofrequency field excitation of magnetic vortex core gyration” Jpn. J. Appl. Phys. 51, 128001 (2012).
  • T. Ohkochi, H. Fujiwara, M. Kotsugi, A. Tsukamoto, K. Arai, S. Isogami, A. Sekiyama, J. Yamaguchi, K. Fukushima, R. Adam, C. M. Schneider, T. Nakamura, K. Kodama, M. Tsunoda, T. Kinoshita, S. Suga: “Microscopic and spectroscopic studies of light-induced magnetization switching of GdFeCo facilitated by photoemission electron microscopy” Jpn, J. Appl. Phys. 51, 073001 (2012).
  • 大河内拓雄 「研究室紹介112:高輝度光科学研究センター(JASRI) 利用研究促進部門 応用分光物性グループ」 真空ジャーナル(日本真空工業会)137, 24 (2011).
  • T. Ohkochi, T. Toshimitsu, H. Yamagami, S. -I. Fujimori, A. Yasui, Y. Takeda, T. Okane, Y. Saitoh, A. Fujimori, Y. Miyauchi, Y. Okuda, R. Settai, Y. Ōnuki, “Observation of itinerant Ce 4f electronic states in CeIrSi3 studied by angle-resolved Ce 3d→4f resonance photoemission spectroscopy” J. Phys. Soc. Jpn. 78 084802 (2009).
  • T. Ohkochi, S. -I. Fujimori, H. Yamagami, T. Okane, Y. Saitoh, A. Fujimori,Y. Haga, E. Yamamoto, Y. Ōnuki, “Observation of 5f electrons in the itinerant limit: Three-dimensional electronic structure of UB2” Phys. Rev. B 78, 165110 (2008).
  • T. Ohkochi, K. Mibu, N. Hosoito, “Depth profile of induced spin polarization in Au layers of Fe/Au(001) superlattices by resonant X-ray magnetic scattering” J. Phys. Soc. Jpn. 75, 104707 (2006).
  • T. Ohkochi, N. Hosoito, K. Mibu,”Depth-selective measurements of induced magnetic polarization in Cu layers of Gd/Cu multilayers by 119Sn Mössbauer spectroscopy” J. Phys.: Condens. Mater. 17, 4023 (2005).
  • T. Ohkochi, N. Hosoito, K. Mibu, H. Hashizume, “Induced magnetic polarization in Cu layers of Gd/Cu multilayers studied by X-ray magnetic circular dichroism” J. Phys. Soc. Jpn. 73, 2212 (2004).


  • 大河内拓雄 「放射光光電子顕微鏡で視る電子/磁気状態 ~顕微XAFSから磁気ダイナミクスまで~」 第8回光科学異分野横断萌芽研究会、神奈川 (2018) (チュートリアル講演)
  • T. Ohkochi “Progress in Nano-Spectroscopic Study by Photoemission Electron Microscopy (PEEM) in SPring-8” Symposium on Surface Science and Nanotechnology –25th Anniversary of SSSJ Kansai–, Kyoto (2017).
  • 大河内拓雄 「放射光光電子顕微鏡で視る磁気情報とダイナミクス」 第210回日本磁気学会研究会/第73回ナノマグネティクス専門研究会、東京 (2016) (招待講演)
  • 大河内拓雄 “Magnetic dynamics study by soft X-ray photoemission electron microscopy” 第40回日本磁気学会学術講演会、金沢市 (2016) (招待講演)
  • T. Ohkochi “Gigantic spin waves in perpendicularly magnetized ferrimagnetic GdFeCo thin film under pulsed light excitation” The 10th LEEM/PEEM workshop Monterey, U.S. (2016).
  • 大河内拓雄 「光電子顕微鏡(PEEM)による軟X線顕微分光と磁気ダイナミクス解析」 放射光学会第8回若手研究会 「軟X線イメージングの描く未来」、岡崎市 (2015) (招待講演)
  • 大河内拓雄 「軟X線光電子顕微鏡による顕微分光分析 ~ナノXAFSから磁区ダイナミクスまで~」 日本分光学会関西支部 平成27年度 最近の分光学の進歩に関する講演会 ―顕微と分光-、大阪市 (2015) (招待講演)
  • T.Ohkochi “Spin dynamics study by time-resolved photoemission electron microscopy (PEEM)” The 3rd International Conference of Asian Union of Magnetics Societies, Haikou, China (2014) (Invited).
  • T. Ohkochi, H. Fujiwara, M. Kotsugi, R. Adam, H. Takahashi, M. Tsunoda, A. Tsukamoto, A. Sekiyama, T. Nakamura, H. Osawa, C. M. Schneider, S. Suga, T. Kinoshita “Magnetic domain formation and its dynamics of GdFeCo thin films by laser induced magnetization reversal” 19th International Vacuum Congress, Paris, France (2013).
  • 大河内拓雄 「時間分解光電子顕微鏡(PEEM)による磁気ダイナミクス研究の新展開」第60回ONSA先端科学研究会 第51回 放射線科学研究会、大阪市 (2013) (招待講演).
  • 大河内拓雄 「光電子顕微鏡(PEEM)による微小領域分光と磁気ダイナミクス解析」日本物理学会第68回年次大会、広島市 (2013) (シンポジウム講演).
  • T. Ohkochi “Photoemission electron microscopy (PEEM) on insulating samples” The 7th International Workshop on Nano-scale Spectroscopy and Nanotechnology, Zürich, Switzerland (2012).


  • H29年度 ~ H31年度 科学研究費補助金(若手研究A) 「時間分解X-FMRイメージングによる交流スピン流のダイナミクス解明」(代表)
  • H26年度 ~ H27年度 科学研究費補助金(若手研究B) 「フェリ磁性薄膜に誘起される巨大スピン波の高度制御」(代表)
  • H26. 1 ~ H27. 3 JASRI利用研究促進部門 GIGNO研究領域創成支援プロジェクト 「軟X線分光のための真空着脱式マイクロ波導入機構の構築」(JASR部門内I内競争的資金、代表)
  • H25年度 ~ H29年度 「国家課題対応型研究開発推進事業」 光・量子融合連携研究開発プログラム 「極限レーザーと先端放射光技術の融合による軟X線物性科学の創成」(分担実施者)