Masato Ohnuma

Faculty of Engineering　Applied Quantum Science and Engineering　Quantum Engineering for MaterialsProfessor
Institute for the Promotion of Business-Regional CollaborationProfessor
Last Updated :2025/11/11

■Researcher basic information

Researchmap personal page

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Research Keyword

  • 食品科学
  • 量子ビーム
  • 小角散乱
  • 誘導磁気異方性
  • 複合材料・物性
  • 中性子散乱
  • 軟磁性材料
  • 安全・安心材料
  • 磁性
  • 酸化物
  • 量子サイズ効果
  • 半導体
  • 複合材料
  • ナノグラニュラー構造薄膜
  • ナノ粒子
  • 無機
  • 鉄鋼材料
  • GHz磁気デバイス
  • 一軸磁気異方性
  • 相変態
  • 中性子小角散乱
  • 薄膜
  • 中性子回折
  • ナノ結晶
  • 化学量論比化合物
  • アトムプローブ
  • Co基薄膜
  • 電子顕微鏡
  • トンネル型磁気抵抗効果
  • 磁気ナノ結晶
  • 電子・情報材料

Research Field

  • Life sciences, Food sciences, Structure of food
  • Nanotechnology/Materials, Structural and functional materials
  • Nanotechnology/Materials, Material fabrication and microstructure control
  • Nanotechnology/Materials, Nanostructure physics
  • Nanotechnology/Materials, Nanostructure chemistry
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electric/electronic material engineering
  • Energy, Quantum beam science

Educational Organization

■Career

Career

  • Apr. 2013 - Present
    Hokkaido University, Faculty of Engineering, Quatum Science and Engineering, Professeor
  • Apr. 2012 - Present
    Kyouto University, Elements Strategy Initiative for Structural Materials, Guest Professor
  • Jul. 2011 - Mar. 2013
    Warsaw University of Technology, Faculty of Materials science and Engineering, Guest Professor
  • Apr. 2011 - Mar. 2013
    National Institute for Materials Science, Quntum Beam Unit, Chief researcher
  • Apr. 2009 - Mar. 2011
    National Institute for Materials Science, Quantum beam center, Chief researcher
  • Jan. 2009 - Dec. 2009
    Touhoku University, Interdiciplinary center, Guest Professor
  • Apr. 2006 - Mar. 2009
    National Institute for Materials Science, Quantum beam center, Senior Resarcher
  • Apr. 2004 - Mar. 2006
    National Institute for Materials Science, Materials Division, senior researcher
  • Apr. 2001 - Mar. 2004
    National Institute for Materials Science, Materials Division, senior researcher
  • Apr. 2000 - Mar. 2001
    National Research Insititute for metals, Computational Materials Science, senior researcher
  • Apr. 1994 - Mar. 2000
    National Research Insititute for metals, Materials design, researcher
  • Mar. 1997 - Feb. 1998
    Riso National Laboratory, Materials Division, Guest Researcher

Educational Background

  • Apr. 1991 - Mar. 1994, Muroran Institute of Technology, Doctor course, graduate school, Materials Science
  • Apr. 1989 - Mar. 1991, Muroran Institute of Technology, Graduate School, Metullurgical Engineering
  • Apr. 1985 - Mar. 1989, Muroran Institute of Technology, Faculty of Engineering, Metullurgical Engineering

Committee Memberships

  • Mar. 2009 - Present
    日本鉄鋼協会, 評価・分析・解析部会委員, Society
  • Apr. 2008 - Mar. 2011
    日本中性子科学会, 波紋編集委員, Society
  • Apr. 2007 - Mar. 2011
    日本金属学会, 会報編集委員, Society
  • Jan. 2007 - Dec. 2008
    日本学術振興会科研費委員会, 専門委員, Government
  • Feb. 2006 - Jan. 2007
    文科省研究振興局科学技術学術審議会, 専門委員, Government

■Research activity information

Papers

Other Activities and Achievements

  • Quantum size effects in the intrinsic nonlinearity of metal plasmonic nanoparticles
    Rodrigo Sato, Rodrigo Sato, Keiji Oyoshi, Masato Ohnuma, Yoshihiko Takeda, Yoshihiko Takeda, Optics InfoBase Conference Papers, 29 Aug. 2016
  • Recent Activity of KUMASANS　　　　　　　　　　　　　　　
    Y. Oba, M. Hino, T. Oda, M. Ohnuma, N. Sato, R. Inoue, M. Sugiyama, The 8th Meeting on Collective Action for Nomadic Small Angle Scatterers, Apr. 2015
    English
  • Quantum size effects in the intrinsic third order nonlinear optical susceptibility of metal clusters: Ag nanospheres-silica glass composites
    Rodrigo Sato, Masato Ohnuma, Keiji Oyoshi, Yoshihiko Takeda, Yoshihiko Takeda, JSAP-OSA Joint Symposia, JSAP 2014, 01 Jan. 2014
  • Performance of the Bragg-edge transmission imaging at a compact accelerator-driven pulsed neutron source
    Hirotaka Sato, Yoshinori Shiota, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi, Yoshiaki Kiyanagi, Physics Procedia, 60, 254, 263, 01 Jan. 2014
  • Activity of hokkaido university neutron source, HUNS
    Michihiro Furusaka, Hirotaka Sato, Takashi Kamiyama, Masato Ohnuma, Yoshiaki Kiyanagi, Yoshiaki Kiyanagi, Physics Procedia, 60, 167, 174, 01 Jan. 2014
  • Imaging of crystalline structural information of Japanese swords by pulsed neutron transmission spectroscopy
    S. Nagashima, Y. Shiota, H. Sato, T. Kamiyama, M. Ohnuma, Y. Kiyanagi, Physics Procedia, 60, 327, 331, 01 Jan. 2014
  • Dispersion of the third order nonlinear optical response of ag nanoparticles with different sizes
    Rodrigo Sato, Masato Ohnuma, Takahisa Ohno, Hiroyoshi Momida, Yoshihiko Takeda, Yoshihiko Takeda, Optics InfoBase Conference Papers, 01 Dec. 2013
  • Characterization of Nanostructures in Co-Insulator Nanogranular Films Using Small-Angle Neutron and X-ray Scattering　　　　　　　　　　　　　　　
    Y. Oba, M. Ohnuma, S. Ohnuma, K. Ohishi, S. Takata, J. Suzuki, M. Sugiyama, The 8th Pacific Rim International Conference on Advanced Materials and Processing, Hawaii, USA, Aug. 2013
    English
  • Nanostructure and Chemical State of Co-Insulator Soft magnetic Nanogranular Film　　　　　　　　　　　　　　　
    Y. Oba, M. Ohnuma, S. Ohnuma, K. Ohishi, K. Takata, J. Suzuki, M. Sugiyama, 15th International Small-Angle Scattering Conference, Sydney, Australia, Nov. 2012
    English
  • Cluster strengthening of steels ~ Importance of characterization for the heterogeneities with a few nanometer scale ~　　　　　　　　　　　　　　　
    M. Ohnuma, P. Kozikowski, Y. Oba, J. Suzuki, M. Furusaka, 15th International Small-Angle Scattering Conference, Sydney, Australia, Nov. 2012
    English
  • Compact-Accelerator Based laboratory-Neutron Source for Nano-Scale Structure Characterization　　　　　　　　　　　　　　　
    M. Furusaka, T. Miyata, M. Ohnuma, Y. Oba, S. Takeda, A. Homma, International Union of Materials Research Societies – International Conference on Electronic Materials 2012, Yokohama, Japan, Sep. 2012
    English
  • Partitioning State of Co in Co-insulator Soft Magnetic Nanogranular Films Characterized by Small-Angle Scattering　　　　　　　　　　　　　　　
    Y. Oba, M. Ohnuma, S. Ohnuma, M. Furusaka, International Union of Materials Research Societies – International Conference on Electronic Materials 2012, Yokohama, Japan, Sep. 2012
    English
  • Unveiling the Origin of Pseudo-Capacitance at Hydrous RuO2 Nanoparticles by Small-Angle X-Ray Scattering　　　　　　　　　　　　　　　
    N. Yoshida, Y. Yamada, S. Nishimura, Y. Oba, M. Ohnuma, A. Yamada, International Union of Materials Research Societies – International Conference on Electronic Materials 2012, Yokohama, Japan, Sep. 2012
    English
  • Characterization of Nanostructures in Co-Pd-Si-O Soft Magnetic Nanogranular Film Using Compact type Small-Angle Neutron Scattering Spectrometer　　　　　　　　　　　　　　　
    Y. Oba, M. Ohnuma, S. Ohnuma, M. Furusaka, 2012 TMS Annual Meeting & Exhibition, Orlando, USA, Mar. 2012
    English
  • Characterization of Morphology and Chemical Composition of Inclusion in Steel Using Small-Angle X-ray and Neutron Scattering　　　　　　　　　　　　　　　
    Y. Oba, S. Koppoju, M. Ohnuma, Y. Kinjo, S. Morooka, Y. Tomota, J. Suzuki, D. Yamaguchi, S. Koizumi, M. Sato, T. Shiraga, 日本MRS学術シンポジウム、2011年12月 (横浜情報文化センター、横浜), Dec. 2011
    English
  • Microstructural Analysis of Metallic Materials using Small-Angle X-ray and Neutron Scattering　　　　　　　　　　　　　　　
    Y. Oba, M. Ohnuma, P. Kozikowski, 1st Asia-Oceania Conference on Neutron Scattering, Tsukuba, Japan, Nov. 2011
    English
  • Micellisation of hydrophobic fullerene amphiphiles in alkane solvents　　　　　　　　　　　　　　　
    ホランビー マーティン, 大場 洋次郎, 大沼 正人, 中西 尚志, 第63回コロイドおよび界面化学討論会、2011年9月 (京都大、京都), Sep. 2011
    English
  • New application of small angle X-ray Scattering: Redox-active nano-RuO2 dispersed in hydrous phase　　　　　　　　　　　　　　　
    N. Yoshida, S. Nishimura, Y. Yamada, Y. Oba, M. Ohnuma, A. Yamada, The 62nd Annual Meeting of the International Society of Electrochemistry, Niigata, Japan, Sep. 2011
    English
  • Application of Small-angle Scattering to Microstructural Characterization of Metals and Alloys
    OHNUMA Masato, 非破壊検査 : journal of N.D.I, 60, 2, 86, 92, 01 Feb. 2011
    日本非破壊検査協会, Japanese
  • Structure and Magnetic Properties of Nanogranular Soft Magnetic Films
    OHNUMA Shigehiro, NAKAMURA Shintaro, OHNUMA Masato, Bulletin of Topical Symposium of the Magnetics Society of Japan, 175, 17, 24, 17 Dec. 2010
    日本磁気学会, Japanese
  • Characterization of Nano-size Heterogeneities by Combining SAXS and SANS　　　　　　　　　　　　　　　
    M. Ohnuma, Y. Oba, K. Suresh, J. Suzuki, 日本MRS学術シンポジウム、2010年12月 (横浜市開港記念会館、神奈川), Dec. 2010
    English
  • Quantitative Analysis for Vanadium Carbide Precipitates in Microalloyed Steels using Small-Angle X-ray and Neutron Scattering　　　　　　　　　　　　　　　
    Y. Oba, M. Ohnuma, T. Murakami, H. Hatano, J. Suzuki, 日本MRS学術シンポジウム、2010年12月 (横浜市開港記念会館、神奈川), Dec. 2010
    English
  • robing nano-scale structures in Ar-ion irradiated c-Si by small angle x-ray scattering　　　　　　　　　　　　　　　
    K. Suresh, M. Ohnuma, Y. Oba, N. Kishimoto, P. Das, T. K. Chini, 日本MRS学術シンポジウム、2010年12月 (横浜市開港記念会館、神奈川), Dec. 2010
    English
  • Nano-Structure of Aggregates Formed by Hydrocarbon–Fluorocarbon Hybrid type Gemini Surfactants in Aqueous Solution　　　　　　　　　　　　　　　
    T. Yoshimura, A. Okuda, H. Iwase, Y. Oba, M. Ohnuma, T. Ogawa, S. Isoda, International Conference on Nanoscopic Colloid and Surface Science, Chiba, Japan, Sep. 2010
    English
  • Aggregation Properties of Amphiphilic Dendrimer in Aqueous Solutions: A Combined Small-Angle Scattering (SANS and SAXS) Study　　　　　　　　　　　　　　　
    H. Iwase, T. Yoshimura, A. Ebihara, Y. Oba, M. Ohnuma, M. Shibayama, International Conference on Nanoscopic Colloid and Surface Science, Chiba, Japan, Sep. 2010
    English
  • Nanostructures and magnetic properties in Co–metal oxide nano-granular films　　　　　　　　　　　　　　　
    Y. Oba, M. Ohnuma, K. Suresh, S. Ohnuma, International Symposium on Advanced Magnetic Materials and Applications 2010, Sendai, Japan, Jul. 2010
    English
  • 20aPS-17 Quantitative evaluation of magnetic cluster size in perpendicular magnetic recording media
    Hagiya H, Oku T, Suzuki J, Kira H, Shinohara T, Kakurai K, Yokoyama M, Nishihara Y, Mamiya H, Oba Y, Ohnuma M, Meeting abstracts of the Physical Society of Japan, 65, 1, 01 Mar. 2010
    The Physical Society of Japan (JPS), Japanese
  • Small-angle scattering as a tool for quantitative analysis of precipitates in steels　　　　　　　　　　　　　　　
    M. Ohnuma, J. Suzuki, K. Suresh, Y. Oba, XIV International Conference on Small-Angle Scattering, Oxford, United Kingdom, Sep. 2009
    English
  • Small-Angle Neutron Scattering Study on Ferromagnetic Pd Nanoparticles using Polarised Neutrons　　　　　　　　　　　　　　　
    Y. Oba, T. Shinohara, T. Oku, J. Suzuki, M. Ohnuma, T. Sato, XIV International Conference on Small-Angle Scattering, Oxford, United Kingdom, Sep. 2009
    English
  • 25pPSA-28 A polarized SANS study of media on perpendicular magnetic recording
    Hagiya H, Oku T, Suzuki J, Kira H, Shinohara T, Kakurai K, Yokoyama M, Nishihara Y, Mamiya H, Oba Y, Onuma M, Meeting abstracts of the Physical Society of Japan, 64, 2, 18 Aug. 2009
    The Physical Society of Japan (JPS), Japanese
  • 23aPS-34 Magnetization process of nano crystalline soft magnets studied by small-angle polarized neutron scattering experiments
    Shionohara T, Suzuki J, Ohnuma M, Oku T, Ohnuma S, Meeting abstracts of the Physical Society of Japan, 63, 1, 29 Feb. 2008
    The Physical Society of Japan (JPS), Japanese
  • Fluence-dependent Formation of Zn and ZnO Nanoparticles by Ion Implantation and Thermal Oxidation: An Attempt to Control Nanoparticle Size
    H. Amekura, M. Ohnuma, N. Kishimoto, Ch. Buchal, S. Mantl, J. Appl. Phys., 104, 11, 114309, 2008
  • Quantitative Analysis of Microstructures by Small-Angle X-Ray and Neutron Scattering
    Ohnuma Masato, Suzuki Jun-ichi, DENKI-SEIKO[ELECTRIC FURNACE STEEL], 79, 3, 217, 227, 2008
    Small-angle scattering is one of simplest methods to evaluate the average size and volume fraction of precipitates in the metals and alloys. The accuracy of the evaluated size is higher than 5 % if the analysis is proceeded in the proper way. In comparison with powder diffraction, however, there are some differences in the way to measure and analyze the small-angle scattering although the principle of the phenomena are same in both way. The key issues for measurements and analysis of small-angle scattering are overviewed and the results for high nitrogen martensitic steel are shown as an ex..., Electric Furnace Steel Forum, Japanese
  • 18aPS-17 Cooperative phenomena in Co-based nano-granular films
    Mamiya H, Ohnuma M, Ohnuma S, Furubayashi T, Fujimori H, Meeting abstracts of the Physical Society of Japan, 62, 1, 28 Feb. 2007
    The Physical Society of Japan (JPS), Japanese
  • 23aXH-4 Thermally assisted soft-magnetism in nano-granular films
    Mamiya H, Ohnuma M, Ohnuma S, Furubayashi T, Fujimori H, Meeting abstracts of the Physical Society of Japan, 61, 2, 18 Aug. 2006
    The Physical Society of Japan (JPS), Japanese
  • Study on Microstructures of Advanced Metallic Materials by Small-Angle X-Ray and Neutron Scattering(Atomic-Scale Analysis)
    OHNUMA Masato, SUZUKI jun-ichi, Japan analyst, 55, 6, 381, 390, 05 Jun. 2006
    The microstructures of metal-nonmetal nano-granular soft magnetic films, precipitation hardened stainless steel and Al-Mg-Si alloys, have been studied by small-angle X-ray/neutron scattering (SAXS/SANS). Quantitative evaluation of average scale of their microstructures in nanometer scale has been accomplished by SAXS and SANS. Using this information, the contribution of the microstructures to the magnetic and mechanical properties are discussed in this paper., The Japan Society for Analytical Chemistry, Japanese
  • 27aPS-82 Structure of ferromagnetic rutile
    Mochiku T, Yamaki K, Shimizu N, Wuernisha Tuerxun, Mori K, Ishigaki T, Kamiyama T, Fujii H, Ohnuma M, Yamada K, Itoh S, Kadowaki K, Hirata K, Meeting abstracts of the Physical Society of Japan, 61, 1, 04 Mar. 2006
    The Physical Society of Japan (JPS), Japanese
  • 中性子鉄鋼研究への応用-2 中性子およびX線小角散乱によるミクロ組織定量測定　　　　　　　　　　　　　　　
    大沼正人, 鈴木淳市, 日本鉄鋼協会誌「ふぇらむ」, 11, 631, 640, 2006
  • Fretting Fatigue Properties of Zr-Based Bulk Amorphous Alloy in Phosphate Buffered Saline Solution
    MARUYAMA Norio, HIROMOTO Sachiko, OHNUMA Masato, HANAWA Takao, 日本金屬學會誌 = Journal of the Japan Institute of Metals, 69, 6, 481, 487, 20 Jun. 2005
    日本金属学会, Japanese
  • Phase diagram of a magnetic fluid : Stability and performance
    MAMIYA H, NAKATANI I, OHNUMA M, FURUBAYASHI T, 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan, 28, 21 Sep. 2004
    Japanese
  • 27aPS-74 Zero-field-cooled susceptibility and field-cooled one in a spin-glass
    Mamiya H, Ohnuma M, Nakatani I, Furubayashi T, Meeting abstracts of the Physical Society of Japan, 59, 1, 03 Mar. 2004
    The Physical Society of Japan (JPS), Japanese
  • 先端ナノヘテロ金属組織解析手法(21)最先端X線回折技術:小角散乱法(2)
    大沼 正人, 金属, 74, 1, 79, 86, Jan. 2004
    アグネ技術センター, Japanese
  • 先端ナノヘテロ金属組織解析手法(20)最先端X線回折技術:小角散乱法(1)
    大沼 正人, 金属, 73, 12, 1233, 1240, Dec. 2003
    アグネ技術センター, Japanese
  • Small-angle neutron scattering study on nanogranular superparamagnetic films
    OHNUMA M, SUZUKI J, HONO K, MITANI S, 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan, 27, 12, 13, 01 Sep. 2003
    Japanese
  • Microstructure of nano-granular metal : nonmetal soft magnetic films
    OHNUMA M, HONO K, OHNUMA S, ONODERA H, FUJIMORI H, 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan, 25, 01 Sep. 2001
    Japanese
  • Cementite decomposition in heavily drawn pearlite steel wire
    K. Hono, M. Ohnuma, M. Murayama, S. Nishida, A. Yoshie, T. Takahashi, Scripta Materialia, 44, 6, 977, 983, 01 Apr. 2001
    English
  • Small-angle neutron scattering and differential scanning calorimetry studies on the copper clustering stage of Fe-Si-B-Nb-Cu nanocrystalline alloys
    M. Ohnuma, K. Hono, S. Linderoth, J. S. Pedersen, Y. Yoshizawa, H. Onodera, Acta Materialia, 48, 20, 4783, 4790, 04 Dec. 2000
    Elsevier Science Ltd, English
  • Microstructures and magnetic properties of Co-Al-O granular thin films
    M Ohnuma, K Hono, H Onodera, S Ohnuma, H Fujimori, JS Pedersen, JOURNAL OF APPLIED PHYSICS, 87, 2, 817, 823, Jan. 2000
    English
  • Small-angle X-ray Scattering Study on Microstructures of Co-Al-O Granular Films
    OHNUMA Masato, HONO Kazuhiro, ONODERA Hidehiro, まてりあ : 日本金属学会会報, 38, 12, 982, 988, 20 Dec. 1999
    日本金属学会, Japanese
  • Microstructure change in Co46Al19O35 granular thin films by annealing
    M Ohnuma, K Hono, H Onodera, S Mitani, JG Ha, H Fujimori, NANOSTRUCTURED MATERIALS, 12, 1-4, 573, 576, Jul. 1999
    English
  • Microstructure of Co-Al-O Granular Thin Films
    OHNUMA Masato, HONO Kazuhiro, ONODERA Hidehiro, MITANI Seiji, FUJIMORI Hiroyasu, まてりあ : 日本金属学会会報, 37, 5, 20 May 1998
    Japanese
  • Microstructure of Co-Al-O granular thin films
    OHNUMA M, HONO K, ABE E, ONODERA H, 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan, 21, 253, a-253-b, 01 Oct. 1997
    Japanese
  • Annealing effect on giant magnetoresistance in sputtered Cu-Co alloy films
    SUGAWARA T, TAKANASHI K, FUJIMORI H, HONO K, OHNUMA M, GOTO A, YASUOKA H, 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan, 20, 01 Sep. 1996
    Japanese
  • Effect of Minute Solute Elements in the Ferrite Matrix on the Inherent Creep Strength of Carbon Steels
    ONODERA Hidehiro, ABE Taichi, OHNUMA Masato, KIMURA Kazuhiro, FUJITA Mitsutane, TANAKA Chiaki, Tetsu- to- Hagane, 81, 8, 821, 826, 01 Aug. 1995
    One of the present authors has proposed a new concept about the Inherent creep strength determining the long term creep strength of ferritic steels. In the present study, effect of solute elements in the ferrite matrix on the Inherent creep strength of 0.2 and 0.3 mass% carbon steels was studied from a view point of atomic configurations such as atomic pairs. The equilibrium concentrations of solute elements and atomic pairs in the ferrite matrix were estimated by thermodynamic calculations with the sublattice model (Thermo-calc.) and the central atoms model, respectively. The following res..., The Iron and Steel Institute of Japan (ISIJ), Japanese
  • 28p-WA-3 A Phase Separation Process in 3-component Microemulsion
    Seto H, Yokoi E, Nagao M, Komura S, Imai M, Suzuki J, Ohnuma M, Schwahn D, Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 49, 3, 16 Mar. 1994
    The Physical Society of Japan (JPS), Japanese
  • 12a-Z-8 The critical phenomenon at the phase separation in 3-component microemulsion system III
    Seto H, Yokoi E, Komura S, Schwahn D, Mortensen K, Suzuki J, Ohnuma M, Ito Y, Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, 1993, 3, 20 Sep. 1993
    The Physical Society of Japan (JPS), Japanese
  • Fe-B-(Si,Ge)非晶質合金におけるα-Fe初晶の晶出形態
    大沼 正人, 桑野 寿, 浜口 由和, 日本金属学会誌, 56, 3, p238, 246, Mar. 1992
    日本金属学会, Japanese