Development of spin-nanocluster hybrid materials for ultra-wide-band electromagnetic wave absorber

• Project/Area Number: 26709018
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: Tohoku University
• Principal Investigator: Ogawa Tomoyuki 東北大学, 工学(系)研究科(研究院), 助教 (50372305)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥22,620,000 (Direct Cost: ¥17,400,000、Indirect Cost: ¥5,220,000); Fiscal Year 2016: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000); Fiscal Year 2015: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000); Fiscal Year 2014: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
• Keywords: スピンナノクラスター / ハイブリッド材料 / 電磁波吸収

Outline of Final Research Achievements

New spin-nanocluster hybrid materials are developed by nano-structure control of three-dimensional self-organization of spin-nanoclusters, which consist of Fe-based spin-nano-clusters with high saturation magnetization and enable to absorb electromagnetic wave for ultra-wide-band.
By combining chemical and physical methods, Fe nanoparticles and Fe-Co alloy nanoparticles has been successfully synthesized, whose saturation magnetization is almost similar to their bulk values. And their hybrid structure of Fe nanoparticles and Fe-oxide nanoparticles has been also successfully fabricated by uniquely developed coagulation method.

Research Products

• [Journal Article] Effect of the change in the interface structure of Pd(100)/SrTiO3 for quantum-well induced ferromagnetism (2017)
  • Author(s): Shunsuke Sakuragi, Tomoyuki Ogawa, and Tetsuya Sato
  • Journal Title: Journal of Magnetism and Magnetic Materials Volume: 423 Pages: 453-457
  • DOI: 10.1016/j.jmmm.2016.09.073
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Stability of cluster glass state in nano order sized YbFe2O4 powders (2017)
  • Author(s): H. Kobayashi
  • Journal Title: Journal of Physics and Chemistry of Solids Volume: 103 Pages: 103-108
  • DOI: 10.1016/j.jpcs.2016.12.014
  • Peer Reviewed
• [Journal Article] Core loss and magnetic susceptibility of superparamagnetic Fe nanoparticle assembly (2016)
  • Author(s): M. Kin
  • Journal Title: AIP Advance Volume: 6 Issue: 12
  • DOI: 10.1063/1.4972059
  • Peer Reviewed / Open Access
• [Journal Article] Improvement of saturation magnetization in Fe nanoparticles by post-annealing in hydrogen (2015)
  • Author(s): M. Kin
  • Journal Title: Journal of Applied Physics Volume: 117 Issue: 17
  • DOI: 10.1063/1.4919050
  • Peer Reviewed
• [Journal Article] Electrochemical fabrication of nanocomposite films containing magnetic metal nanoparticles (2015)
  • Author(s): Y. Hayashi, S. Hashi, H. Kura, T. Yanai, T. Ogawa, K. Ishiyama, M. Nakano and H. Fukunaga
  • Journal Title: Japanese Journal of Applied Physicss Volume: 54 Issue: 7 Pages: 075201-075201
  • DOI: 10.7567/jjap.54.075201
  • NAID: 210000145357
  • Peer Reviewed
• [Presentation] 外部磁界を用いた窒化鉄ナノ粒子柱状集合体の作製とその高周波磁気特性 (2016)
  • Author(s): 本波優介
  • Organizer: 第40回日本磁気学会学術講演会
  • Place of Presentation: 金沢大学（石川県・金沢市）
  • Year and Date: 2016-09-05
• [Presentation] Rotational hysteresis loss analysis for randomly oriented alpha”-Fe16N2 nanoparticles assembly (2016)
  • Author(s): Masahiro Tobise
  • Organizer: 2016 International Conference of Asian Union of Magnetics Societies (ICAUMS 2016)
  • Place of Presentation: Tainan (Taiwan)
  • Year and Date: 2016-08-01
  • Int'l Joint Research / Invited
• [Presentation] Size control and reaction dynamics of monodisperse Fe nanoparticles synthesized by thermolysis of Fe(CO)5 with slow injection for high frequency soft magnetic materials (2016)
  • Author(s): T. Ogawa
  • Organizer: 2016 Joint MMM-Intermag Conference
  • Place of Presentation: San Diego (USA)
  • Year and Date: 2016-01-11
  • Int'l Joint Research
• [Presentation] Core loss properties of chemically synthesized Fe nanoparticle assembly (2016)
  • Author(s): M. Kin
  • Organizer: 2016 Joint MMM-Intermag Conference
  • Place of Presentation: San Diego (USA)
  • Year and Date: 2016-01-11
  • Int'l Joint Research
• [Presentation] Challenge to the Synthesis of alpha”-Fe16N2 Compound Nanoparticle with High Saturation Magnetization for Rare Earth Free New Permanent Magnetic Material (2015)
  • Author(s): 小川智之
  • Organizer: 第76回応用物理学会秋季学術講演会
  • Place of Presentation: 名古屋国際会議場（愛知県・名古屋市）
  • Year and Date: 2015-09-13
  • Invited
• [Presentation] Feナノ粒子集合体のコアロス特性 (2015)
  • Author(s): 金甫根
  • Organizer: 第39回日本磁気学会学術講演会
  • Place of Presentation: 名古屋大学（愛知県・名古屋市）
  • Year and Date: 2015-09-08
• [Presentation] Modified Snoek’s limit for columnar structure of Fe-based nanoparticle assembly (2014)
  • Author(s): T. Ogawa
  • Organizer: 59th Annual Conference on Magnetism and Magnetic Materials (MMM 2014)
  • Place of Presentation: Honolulu (USA)
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] Improvement of saturation magnetization of Fe nanoparticles by post-annealing in a hydrogen gas atmosphere (2014)
  • Author(s): M. Kin
  • Organizer: 59th Annual Conference on Magnetism and Magnetic Materials (MMM 2014)
  • Place of Presentation: Honolulu (USA)
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] Fabrication and magnetic properties of composite film utilizing metal magnetic nanoparticles by electrochemical method (2014)
  • Author(s): Y. Hayashi
  • Organizer: 59th Annual Conference on Magnetism and Magnetic Materials (MMM 2014)
  • Place of Presentation: Honolulu (USA)
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] Effect of columnar structure on magnetic response in GHz-band for Fe-based nanoparticle assembly (2014)
  • Author(s): T. Ogawa
  • Organizer: 2014 IEEE International Conference on Microwave Magnetics (2014 IEEE ICMM)
  • Place of Presentation: 仙台国際センター（宮城県・仙台市）
  • Year and Date: 2014-06-29 – 2014-07-02