Updated on 2024/07/02

写真a

 
MITSUI Yoshifuru
 
Organization
Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Department of Science Physics and Astronomy Program Associate Professor
Title
Associate Professor
External link

Degree

  • 博士(工学) ( 2012.9   東北大学 )

Research Interests

  • 磁性

  • 強磁場

  • Magneto-Science

Research Areas

  • Nanotechnology/Materials / Metallic material properties  / 磁性材料; 強磁場合成

Education

  • Tohoku University

    2009.3 - 2012.9

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    Country: Japan

  • Tohoku University

    2007.4 - 2009.3

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    Country: Japan

  • Tohoku University

    2003.4 - 2007.3

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    Country: Japan

Research History

  • Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Department of Science Physics and Astronomy Program   Associate Professor

    2020.4

  • Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Physics and Astronomy Course   Associate Professor

    2014.4 - 2020.3

  • 東北大学金属材料研究所   助教

    2012.11 - 2014.3

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    Country:Japan

  • Tohoku University   Special researcher of the Japan Society for the Promotion of Science

    2010.4 - 2012.9

Professional Memberships

  • 日本鉄鋼協会

    2019

  • 応用物理学会

    2015.10

  • 日本磁気科学会

    2015.10

  • 日本物理学会

    2015.10

  • 日本磁気学会

    2015.10

  • 日本金属学会

    2015.10

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Committee Memberships

  • 9th International Workshop on Materials Analysis and Processing in magnetic fields   Local Organizing Committee  

    2023.1 - 2023.12   

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    Committee type:Academic society

  • 日本磁気科学会   年会現地実行委員  

    2021.4 - 2021.11   

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    Committee type:Academic society

  • 日本磁気科学会   役員 特定事項(将来構想)  

    2021.1 - 2022.12   

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    Committee type:Academic society

  • 日本金属学会   講演大会委員  

    2019.4   

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    Committee type:Academic society

  • 日本金属学会   会報編集委員会  

    2019.4   

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    Committee type:Academic society

  • 日本磁気科学会   事務局委員会(広報)  

    2017.4 - 2020.12   

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    Committee type:Other

  • 応用物理学会   プログラム編集委員  

    2016.12 - 2021.10   

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    Committee type:Other

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Papers

  • Keiichi Koyama, Yoshifuru Mitsui, Saki Imatsuji, Akari Onaka, Ryota Kobayashi, Masahira Onoue, Reisho Onodera .  Study of heat treatment effect on magnetic properties of MnFeGe using 57Fe Mössbauer spectroscopy .  Interactions245   116   2024.6Study of heat treatment effect on magnetic properties of MnFeGe using 57Fe Mössbauer spectroscopyReviewed

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: https://doi.org/10.1007/s10751-024-01951-9

  • Masahira Onoue, Yoshifuru Mitsui, Ryota Kobayashi, Rie Y. Umetsu Yoshiya Uwatoko, Keiichi Koyama .  Magnetic field effect on decomposition of Sm2Fe17N3 probed using 57Fe Mössbauer spectroscopy .  Interactions245   107   2024.6Magnetic field effect on decomposition of Sm2Fe17N3 probed using 57Fe Mössbauer spectroscopyReviewed

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: https://doi.org/10.1007/s10751-024-01942-w

  • Yoshifuru Mitsui, Kohei Baba, Ryota Kobayashi, Masahira Onoue, Wataru Ito, Shunsuke Kuzuhara, Keiichi Koyama .  High magnetic field effects on the phase separation behaviour of Fe-15mass%Cu alloys probed by 57Fe Mössbauer spectroscopy .  Interactions245   105   2024.6High magnetic field effects on the phase separation behaviour of Fe-15mass%Cu alloys probed by 57Fe Mössbauer spectroscopyReviewed

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: https://doi.org/10.1007/s10751-024-01939-5

  • Controlling the growth of yeast by culturing in high magnetic fields .    586   171193   2023.11Controlling the growth of yeast by culturing in high magnetic fieldsReviewed

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1016/j.jmmm.2023.171193

  • Taisei Takaoka, Yoshifuru Mitsui, Keiichi Koyama, Shinpei Fujii .  Site Selectivity and Structural Stabilization in Cu-Doped or Fe-Doped MnCoGe .  Materials Transactions64 ( 9 ) 2109 - 2112   2023.9Site Selectivity and Structural Stabilization in Cu-Doped or Fe-Doped MnCoGeReviewed

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.2320/matertrans.MT-MG2022011

  • Kota Nakamoto, Yoshifuru Mitsui, Ryota Kobayashi, Keiichi Koyama .  In-Magnetic-Field Heat Treatment Effects on Phase Growth of Mn–Bi–Sn Composite .  Materials Transactions64 ( 9 ) 2113 - 2117   2023.9In-Magnetic-Field Heat Treatment Effects on Phase Growth of Mn–Bi–Sn CompositeReviewed

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.2320/matertrans.MT-MG2022014

  • Yoshifuru MITSUI, Hideto TANAKA, Masahira ONOUE, Moriharu NAGANO, Ryota KOBAYASHI, Rie Y. UMETSU, Keiichi KOYAMA .  Magnetic and Hyperfine Properties of FeZnSb .  JPS Conference Proceedings38   011138   2023.5Magnetic and Hyperfine Properties of FeZnSbReviewed

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.7566/JPSCP.38.011138

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  • Masahira ONOUE, Yoshifuru MITSUI, Saki IMATSUJI, Ryota KOBAYASHI, Reisho ONODERA, Keiichi KOYAMA .  Magnetic Properties of MnFeGe Probed Using 57Fe Mössbauer-spectroscopy .    38 - 011139   2023.5Magnetic Properties of MnFeGe Probed Using 57Fe Mössbauer-spectroscopyReviewed

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    DOI: 10.7566/JPSCP.38.011139

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  • Takeuchi Y., Yoshikawa R., Mitsui Y., Iwasaka M., Matsuda M., Hamasaki A. .  Differences in the Optical Response of MSU and CPP Crystals During Magnetic Orientation: Possibility of Diagnosing Gout and Pseudogout .  Bioelectromagnetics44   204 - 210   2023Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Bioelectromagnetics  

    Pseudogout is crystalline arthritis. It has a similar clinical picture to that of gout, and it is difficult to distinguish the two diseases using conventional analysis methods. However, it is important to identify the different crystals responsible for these two cases because the treatment strategies are different. In a previous study, we reported magnetic orientation of monosodium urate (MSU) crystals, which are the causative agent of gout, at the permanent magnet level. In this study, we investigated the effect of an applied magnetic field on calcium pyrophosphate (CPP) crystals, which are the causative agent of pseudogout, and the difference in the magnetic responses of CPP and MSU crystals. We found that the CPP crystals were oriented in a magnetic field on milli-Tesla order because of the anisotropy of the diamagnetic susceptibility. In addition, the CPP crystals exhibited different anisotropic magnetic properties from those of MSU crystals, which led to a characteristic difference between the orientations of the two crystals. That is, we found that the causative agents of gout and pseudogout responded differently to a magnetic field. This report suggests that the discrimination between CPP and MSU by optical measurements is possible by application of magnetic fields appropriately. © 2023 Bioelectromagnetics Society.

    DOI: 10.1002/bem.22444

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  • Akari Onaka, Masahira Onoue, Reisho Onodera, Yoshifru Mitsui, Keiichi Koyama .  Magnetic and structural properties of Fe-substituted MnCoGe with Ni2In-type structure .  Journal of Magnetism and Magnetic Materials563   170000   2022.12Magnetic and structural properties of Fe-substituted MnCoGe with Ni2In-type structureReviewed

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1016/j.jmmm.2022.170000

  • Junki Takahashi, Yoshifuru Mitsui, Masahira Onoue, Ryota Kobayashi, Keiichi Koyama .  Nitridation kinetics of Sm2Fe17 probed using Mössbauer spectroscopy .  Journal of Magnetism and Magnetic Materials554   169295   2022.7Nitridation kinetics of Sm2Fe17 probed using Mössbauer spectroscopyReviewed

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    DOI: https://doi.org/10.1016/j.jmmm.2022.169295

  • Fujii S., Mitsui Y., Koyama K. .  Ab initio Study of Atomic-disorder Effect on Electronic and Magnetic Properties of CrAGe .  Journal of the Physical Society of Japan91 ( 6 )   2022.6Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publisher:Journal of the Physical Society of Japan  

    First-principles calculations show that the atomic disorder between Al and Ge does not destroy the half-metallic character of CrAlGe, and that its unique character is, however, destroyed by the swap between Cr and Al (or Ge). Our analysis of the X-ray diffraction patterns of CrAlGe indicates the existence of this swap disorder.

    DOI: 10.7566/JPSJ.91.064706

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  • Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Kohki Takahashi, Keiichi Koyama .  Acceleration of B2/L21 order-disorder transformation in Ni2MnAl Heusler alloys by in-magnetic-field annealing .  Journal of Magnetism and Magnetic Materials547   168908   2022.4Acceleration of B2/L21 order-disorder transformation in Ni2MnAl Heusler alloys by in-magnetic-field annealingReviewed

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    DOI: https://doi.org/10.1016/j.jmmm.2021.168908

  • Yoshifuru Mitsui, Masahira Onoue, Ryota Kobayashi, Kaori Sato, Shunsuke Kuzuhara, Wataru Ito, Kohki Takahashi, Keiichi Koyama .  High Magnetic Field Effects on Cu-precipitation Behavior of Fe-1mass%Cu at 773 K .    62 ( 3 ) 413 - 417   2022.3High Magnetic Field Effects on Cu-precipitation Behavior of Fe-1mass%Cu at 773 KReviewed

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.2355/isijinternational.ISIJINT-2021-404

  • Yumi Watanabe, Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Keiichi Koyama .  Magnetic-field-induced selective retardation of reaction in Mn/Ga diffusion couple .  Journal of Alloys and Compounds887   161310   2021.12Magnetic-field-induced selective retardation of reaction in Mn/Ga diffusion coupleReviewed

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1016/j.jallcom.2021.161310

  • Shun Nakagawa, Yoshifuru Mitsui, Ryota Kobayashi, Rie Y. Umetsu, Kohki Takahashi, Keiichi Koyama .  Magnetic-field-induced decomposition in Cu2MnAl Heusler alloys .  Journal of Magnetism and Magnetic Materials540   168411   2021.12Magnetic-field-induced decomposition in Cu2MnAl Heusler alloysReviewed

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1016/j.jmmm.2021.168411

  • Yumi Watanabe, Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Keiichi Koyama .  Magnetic-field-induced selective retardation of reaction in Mn/Ga diffusion couple .  Journal of Alloys and Compounds887   161310 - 161310   2021.12Reviewed

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jallcom.2021.161310

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  • Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Masaki Mizuguchi, Keiichi Koyama .  Synthesis of ferromagnetic ¸-mnalc by reactive sintering .  Materials Transactions62 ( 1 ) 130 - 134   2021Reviewed

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    © 2020 The Japan Institute of Metals and Materials. Ferromagnetic MnAlC (¸-phase) can be synthesized by a single-route conventional reactive sintering method. The maximum magnetization and coercivity were 75.8 Am2/kg and 57 mT, respectively. The ¸-phase fraction was evaluated to be 81 mass% for Mn55Al45C2 annealed at 1273 K. The ¸-phase of Mn55Al45C2 can be synthesized at an annealing temperature from 873 to 1273 K, whereas that of Mn55Al45 cannot be synthesized. It was indicated that the phase stability of the hcp-phase (¾-phase) was improved by adding carbon, resulting in an ¾¸ transformation.

    DOI: 10.2320/matertrans.MT-M2020166

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  • Rie Y. Umetsu, Satoshi Semboshi, Yoshifuru Mitsui, Hirokazu Katsui, Yoshito Nozaki, Isamu Yuitoo, Teruaki Takeuchi, Mikiko Saito, Hiroshi Kawarada .  Microstructure, morphology and magnetic property of (001)-textured MnAlGe Films on Si/SiO<inf>2</inf> substrate .  Materials Transactions62 ( 5 ) 680 - 687   2021Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Institute of Metals and Materials  

    Substrate heating effects on the microstructure and magnetic properties of MnAlGe films grown on Si/SiO2 substrate by sputtering system were investigated. The MnAlGe film fabricated by low-temperature substrate heating demonstrated amorphous phase and paramagnetic property. The film of c-axis orientation associated with the Cu2Sb-type structure was obtained by sputtering at a substrate heating temperature of 270°C and it exhibited perpendicular magnetic anisotropy. From the magnetization curves measured at room temperature, the uniaxial magnetic anisotropy energy, Ku, was evaluated to be in the order of 106 erg/cm3, which is consistent with the literature, although the heating processing and temperature are slightly different. Microstructural observation indicated that the c-axis oriented grains were isolated in the matrix of the amorphous phase. The film lost the c-axis orientation at elevated substrate heating temperature, resulting in loss of the anisotropic magnetic property.

    DOI: 10.2320/matertrans.MT-M2020309

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  • Ryota Kobayashi, Akio Takaki, Yoshifuru Mitsui, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama .  Dual acceleration of ¾-¸ transformation in mnal induced by Zn-addition and in-magnetic-field annealing .  Materials Transactions62 ( 1 ) 124 - 129   2021Reviewed

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Institute of Metals and Materials  

    © 2020 The Japan Institute of Metals and Materials. Combined accelerating effects of ¾¸ phase transformation by in-magnetic-field annealing and Zn-addition were investigated for Mn53Zn2Al45 in magnetic fields up to 15 T. The in-field annealing for Zn-added sample accelerated the ¾¸ transformation 16 times faster than Mn55Al45 at annealing temperature of 623 K. The reduction of magnetization after finishing ¾¸ transformation was also more rapid than that of Mn55Al45. However, magnetic-field-induced acceleration of ¾¸ phase transformation and suppression of precipitation of ¢-phase were observed for Zn-added alloy Mn53Zn2Al45 annealed at 573 K. The obtained results suggested that the ¢-phase stabilized against both ¸- and ¾-phases by Zn-addition. Therefore, although the ¾¸ transformation was efficiently accelerated by in-field annealing of Mn53Zn2Al45, more precisely control of annealing time is required for obtaining high fraction of ferromagnetic ¸-phase.

    DOI: 10.2320/matertrans.MT-M2020235

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  • Yoshifuru Mitsui, Yudai Takanaga, Ryota Kobayashi, Keiichi Koyama .  Effect of carbon addition on the phase stability of hcp-Mn-Al .  Physica B: Condensed Matter595   412379   2020.10Reviewed

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    © 2020 Elsevier B.V. Phase stability of hcp-Mn-Al (ε-phase) was found to improve by carbon addition. MnxAl100-xCy (50 ≤ x ≤ 63 and 0 ≤ y ≤ 2) samples were prepared by reactive sintering method. The annealing and quenching of the samples were carried out for 700 to 1100°C. The precipitation of ε-phase was observed at y = 2 even the annealing temperature of 800°C, which was β + γ2 region in the Al–Mn phase diagram. It is suggested that the carbon addition enhanced the phase stability of ε-phase and contributed for the stable synthesis of τ-phase by ε−τ transformation.

    DOI: 10.1016/j.physb.2020.412379

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  • Masahira Onoue, Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Yoshiya Uwatoko, Keiichi Koyama .  Magnetic field-induced nitridation of Sm<inf>2</inf>Fe<inf>17</inf> .  Journal of Alloys and Compounds835   155193   2020.9Reviewed

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    © 2020 Elsevier B.V. Nitridation of Sm2Fe17 powder was performed under a 5-T magnetic field for the temperature range 623–743 K to clarify the magnetic field effect on nitridation. Applying a magnetic field of 5 T promoted nitridation by approximately 0.6 nitrogen atoms per formula unit compared with zero-field nitrogenation, and almost fully-nitride Sm2Fe17N2.9 was obtained at 743 K. The magnetic field effect was discussed using a grain growth model based on magnetic properties of nitride-poor Sm2Fe17Nx (x < 3) phase and fully-nitride Sm2Fe17N3 phase. The obtained results show that in-field nitridation helps to synthesize nitride Sm2Fe17N3 system in the present condition.

    DOI: 10.1016/j.jallcom.2020.155193

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  • Kohei Noguchi, Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Jun Gouchi, Yoshiya Uwatoko, Keiichi Koyama .  Heat treatment effect on the magnetic properties and martensitic transformations of MnCoGe .  Journal of Magnetism and Magnetic Materials499   166199   2020.4Reviewed

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    © 2019 Elsevier B.V. X-ray powder diffraction, differential scanning calorimetry, and magnetization measurements were performed to investigate the effects of heat treatment on the magnetic and structural properties of as-cast and aging treated MnCoGe. The martensitic transformation temperature of the as-cast sample was 526 K for its first heating cycle, which decreased with repeating thermal cycles of 300–1273 K. MnCoGe prepared by aging treatment of 873 K for 7 days showed a first-order magnetic transition, which was accompanied by a martensitic transformation at 307 K. However, the transformation was not detected when the aging temperature was increased up to 973 K. The martensitic transformation temperature and volume of the parent phase was found to have a positive correlation.

    DOI: 10.1016/j.jmmm.2019.166199

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  • Yoshifuru Mitsui, Toshiaki Hagio, Kohki Takahashi, Keiichi Koyama .  High magnetic field effects on the solid-liquid reaction of Fe-Ga system .  ISIJ International60 ( 4 ) 807 - 811   2020Reviewed

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    © 2020 ISIJ. The effect of magnetic fields on solid-liquid reactions in the Fe-Ga binary system was investigated using Fe/Ga diffusion couples. The reaction and phase growth proceeded by diffusion-controlled process for both 0 and 10 T. It is found that the growth of the intermetallic phases was suppressed by magnetic fields of 10 T regardless of whether α-Fe was in a ferromagnetic or paramagnetic state. The pre-exponential factors in the parabolic coefficient of the Fe3Ga + eutectic region at 0 and 10 T were 2.50 ×104 m2/s and 1.32 ×103 m2/s, respectively. Meanwhile, activation energies at 0 and 10 T were 336 kJ/mol and 318 kJ/mol, respectively, which indicated the ineffectiveness of magnetic fields. That is, reduction of pre-exponential factor of the parabolic coefficient leads the magnetic-field-induced suppression of the reaction in Fe/Ga.

    DOI: 10.2355/isijinternational.ISIJINT-2019-470

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  • Keiichi Koyama, Masahira Onoue, Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Yoshiya Uwatoko .  Magnetic field effect on nitrogenation of Sm<inf>2</inf>Fe<inf>17</inf> .  Materials Transactions61 ( 8 ) 1487 - 1491   2020Reviewed

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    © 2020 The Japan Institute of Metals and Materials Nitrogenation of Sm2Fe17 powder was performed under a zero field and a magnetic field of 5 T at 623, 673 and 743 K to clarify the magnetic field effect on nitrogenation. Applying a magnetic field of 5 T induced nitrogenation compared with zero-field nitrogenation, and almost fully nitride Sm2Fe17N2.9 was obtained at 743 K. Mössbauer spectroscopy results suggested that a 5-T magnetic field promoted the phase transformation to the fully-nitride Sm2Fe17N3 phase. The magnetic field effect was discussed based on the magnetic energy gain and magnetic properties of host Sm2Fe17 and fully nitride Sm2Fe17N3

    DOI: 10.2320/matertrans.MT-MN2019012

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  • Kohei Noguchi, Yoshifuru Mitsui, Masahiko Hiroi, Rie Y. Umetsu, Jun Gouchi, Yoshiya Uwatoko, Keiichi Koyama .  Effects of substituted elements on spin reorientation in Mn<inf>2</inf><sup>1</sup><inf>x</inf>Fe<inf>x</inf>Sb<inf>1</inf><sup>1</sup><inf>y</inf>Sn<inf>y</inf> .  Materials Transactions61 ( 8 ) 1492 - 1495   2020Reviewed

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    © 2020 The Japan Institute of Metals and Materials The spin reorientation and Curie temperature of Mn21xFexSb11ySny (0 ¯ x, y ¯ 0.15) compound were investigated by magnetization measurements. Spin reorientation temperature increased from 255 K at x = 0 to 383 K at x = 0.15, whereas it almost unchanged by Sn substitution. Curie temperature decreased down to 518 K with both Fe and Sn substitution. Substitution of Fe stabilized the ferrimagnetic state with magnetic moment lying in c-plane. Substitution of Sn induced the antiferromagnetic phase at low temperature. It was found that the magnetic hysteresis derived from quasi first-order magnetic phase transition exhibited at x 2 0.10 or T 2 300 K.

    DOI: 10.2320/matertrans.MT-MN2019016

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  • Takuya Deguchi, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Takehide Koyama, Takao Kohara, Hiroyuki Nakamura, Yoshifuru Mitsui, Keiichi Koyama .  Magnetic measurements of narrow-gap semiconductor FeSb<inf>2</inf> under high pressure .  Materials Transactions61 ( 8 ) 1476 - 1479   2020Reviewed

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    © 2020 The Japan Institute of Metals and Materials Pressure effects on magnetic susceptibility» and energy gap Eg0 of narrow-gap semiconductor FeSb2 were investigated for the temperature range of 50300 K and pressures up to 13 kbar. The estimated Eg0 for ambient pressure, Eg0(0), was 29 meV. By application of pressure,» was suppressed, and Eg0(P) was estimated to be 52 meV for 13 kbar. The fourth-order expansion coefficient £ of the free energy in magnetization was positive and enhanced by applying pressures.

    DOI: 10.2320/matertrans.MT-MN2019015

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  • Anna Tanaka, Soshi Yoshinaga, Yoshifuru Mitsui, Hiroe Sasaki, Takeshi Kanomata, Keiichi Koyama .  Magnetic properties of weak itinerant electron ferromagnet Au<inf>4</inf>V .  Materials Transactions61 ( 8 ) 1473 - 1475   2020Reviewed

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    © 2020 The Japan Institute of Metals and Materials The magnetization measurements were carried out for polycrystalline Au4V in magnetic fields up to 130 kOe. The spontaneous magnetic moment ps was determined to be 0.255 ®B/V at 4 K by high field magnetization. The magnetization process was analyzed on the basis of Takahashi’s spin fluctuation theory for weak itinerant electron ferromagnets. The characteristic parameters of the spin fluctuation were estimated to be TA = 1.3 © 103 K and T0 = 2.3 © 103 K using the data for 110130 kOe.

    DOI: 10.2320/matertrans.MT-MN2019011

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  • Kaho Nagano, Yuri Okubo, Yoshifuru Mitsui, Keiichi Koyama, Shinpei Fujii .  Ab-initio study on structural and magnetic properties of fe-doped MnCoGe .  Materials Transactions61 ( 8 ) 1434 - 1437   2020Reviewed

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    © 2020 The Japan Institute of Metals and Materials. First-principles calculations were performed to investigate the effect of Fe substitution on the structural transformation of (Mn,Fe)CoGe and Mn(Co,Fe)Ge. The activation energy (barrier) between orthorhombic and hexagonal structures was estimated from the total energy of each of several virtual structures between them. Fe substitution reduces the activation energy, and movements of both of Co and Mn are closely related to the reduction. Moreover, the calculation result for the Fe substitution at the sites of both Mn and Co indicates that Fe atoms randomly occupy Mn and Co sites.

    DOI: 10.2320/matertrans.MT-MN2019013

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  • MITSUI Yoshifuru, ONOUE Masahira, KOYAMA Keiichi .  Selective Synthesis of Magnetic Materials by Reaction under Magnetic Fields .  Materia Japan59 ( 8 ) 422 - 428   2020Reviewed

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    Language:Japanese   Publisher:The Japan Institute of Metals and Materials  

    DOI: 10.2320/materia.59.422

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  • Hayato Masumitsu, Soshi Yoshinaga, Yoshifuru Mitsui, Rie Y. Umetsu, Masahiko Hiroi, Yoshiya Uwatoko, Keiichi Koyama .  Weak itinerant-electron ferromagnetism of CrAlGe modified by 3d transition metal .  Journal of Magnetism and Magnetic Materials492   165677   2019.12Reviewed

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    © 2019 Elsevier B.V. Substitution effects on weak itinerant electron ferromagnetism in Cr-based ternary alloy CrAlGe were investigated. It was found that substitution of Cr by 3d transition metal with more electrons than Cr enhanced the spontaneous magnetization and Curie temperature. In addition, the itinerancy of CrAlGe was suppressed with the increase of electrons. The ferromagnetism of CrAlGe was related to electron number rather than lattice parameters. The origin of change of itinerancy was suggested to be Coulomb force caused by effective nuclear charge.

    DOI: 10.1016/j.jmmm.2019.165677

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  • Ryota Kobayashi, Yoshifuru Mitsui, Kohoki Takahashi, Satoshi Uda, Keiichi Koyama .  In-Field Annealing and Quenching for Ferromagnetic MnBi under 19 T .  IEEE Transactions on Magnetics55 ( 2 ) 1000204   2019.2Reviewed

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    © 1965-2012 IEEE. An in-field annealing-quenching furnace utilized for magnets with a 52 mm experimental bore was developed. The cooling rate from 663 to 473 K was 38 K/s under a magnetic field of 19 T. The phase boundary between the ferromagnetic MnBi and the paramagnetic Mn1.08Bi was examined using this furnace. The phase boundary was confirmed around 663 K. It was found that the MnBi grain became elongated during recrystallization under 19 T.

    DOI: 10.1109/TMAG.2018.2872105

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  • Yoshifuru Mitsui, Ryota Kobayashi, Yudai Takanaga, Akio Takaki, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama .  Different magnetic field effects on the ϵ-τ Phase transformation between (mn,zn)-al and mn-al-c .  IEEE Transactions on Magnetics55 ( 2 ) 2100704   2019.2Reviewed

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    © 1965-2012 IEEE. In-magnetic-field annealing (IFA) effects on Zn-modified Mn-Al and Mn-Al-C were investigated at the annealing temperature of 573 K, which was around their $_Rftxt-{\mathrm {C } }$. Mn53Zn2Al45 showed the magnetic-field-induced acceleration of the phase transformation to $\text{L}1-{0}$ -phase ( $\tau $ -phase) and the suppression of that to nonferromagnetic equilibrium phase. For Mn55Al45C2, IFA effects were not clearly detected. These different magnetic field effects were discussed by the difference of the mechanism in stabilization of $\tau $ -phase. It is found by a thermal analysis that the modification of Zn stabilized $\tau $ -phase against $\epsilon $ -phase, realizing acceleration of transformation to $\tau $ -phase. The addition of carbon stabilized $\epsilon $ -phase against $\tau $ -phase. The ineffectiveness of in-field annealing for Mn-Al-C is due to the stabilization of $\epsilon $ -phase and the reduction of the Curie temperature. The combination of Zn modification and IFA is realized to synthesize high fraction of $\tau $ -phase for short annealing time and low annealing temperature.

    DOI: 10.1109/TMAG.2018.2860559

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  • Syoichi Eto, Yusuke Fukuda, Yoshifuru Mitsui, Masakazu Ito, Keiichi Koyama, Shinpei Fujii .  Stable structure, magnetic and electronic properties of (Mn,Cr)alge .  Journal of the Physical Society of Japan88 ( 6 ) 064709   2019Reviewed

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    ©2019 The Physical Society of Japan First-principles total-energy calculations showed that the stable structure of (MnxCr1−x)AlGe changes from Cu2Sb to TiSi2 structures at xc, where 0.25 > xc > 0.125. In the Cu2Sb-type structure, a ferromagnetic state occurs, that is, the magnetic moments on Mn and Cr are parallel to each other. In the TiSi2-type structure, a ferrimagnetic (ferromagnetic) state occurs with Mn (Cr) rich concentration. However, the magnetic moment per formula unit increases linearly as the concentration of Mn decreases. TiSi2-type (Mn,Cr)AlGe holds half metallicity, except in the case of MnAlGe. The whole magnetic and electronic properties of (Mn,Cr)AlGe are not sensitive to the chemical disorder between Mn and Cr atoms.

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  • Yumi Watanabe, Toshiaki Hagio, Ryota Kobayashi, Yoshifuru Mitsui, Keiichi Koyama .  Phase formation of a solid-liquid MnGA diffusion couple under a magnetic field .  Materials Transactions60 ( 10 ) 2195 - 2198   2019Reviewed

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    ©2019 The Japan Institute of Metals and Materials In-field heat treatments of an Mn-Ga diffusion couple were performed at 773 K for 12, 24 and 48 h to investigate the phase formation under magnetic fields. Formation of the MnGa3, Mn2Ga5, MnGa, Mn3Ga2 and ¢-Mn phases was confirmed for magnetic fields of 0 T and 5 T. For a diffusion-controlled process, there is a parabolic relationship between the thickness of the phase layers and annealing time for the MnGa and Mn2Ga5 phases. The parabolic coefficients of MnGa and Mn2Ga5 for a zero magnetic field were determined as 8.7 © 10-3 µm2s-1 and 4.6 © 10-1 µm2s-1 respectively. For a magnetic field of 5 T, the parabolic coefficients were evaluated as 11 © 10-3 µm2s-1 for the MnGa phase and 4.5 © 10-1 µm2s-1 for the Mn2Ga5 phase.

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  • Masahira Onoue, Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Yoshiya Uwatoko, Keiichi Koyama .  In-field heat treatment effect on nitridation of Sm<inf>2</inf>Fe<inf>17</inf> .  Materials Transactions60 ( 10 ) 2179 - 2182   2019Reviewed

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    © 2019 The Japan Institute of Metals and Materials. An in-field heat treatment furnace utilized for a magnet with a 50 mm room-temperature bore was made to study magnetic field effect on gas-solid reaction. Using this furnace, nitridation of Sm2Fe17 powder was performed under a 5-T magnetic field and a 0.1-MPa nitrogen gas pressure for the temperature range 623 to 743 K. Applying a magnetic field of 5 T promoted nitridation by approximately 0.6 nitrogen atoms per formula unit compared with zero-field nitridation, and almost fully nitride Sm2Fe17N2.9 was obtained at 743 K.

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  • Kobayashi Ryota, Mitsui Yoshifuru, Y. Umetsu Rie, Takahashi Kohki, Mizuguchi Masaki, Koyama Keiichi .  Magnetic-Field-Induced Enhancement of Phase Transformation in Ferromagnetic τ-Mn-Al .  Journal of the Japan Institute of Metals and Materials83 ( 6 ) 181 - 185   2019Reviewed

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    <p>The magnetic field effect on phase formations of ferromagnetic Mn-Al (τ-phase) was evaluated. The transformation from ε-phase with hcp-structure to τ-phase was accelerated by annealing in magnetic field. With in-field annealing at 623 K, the magnetization of the sample annealed at 15 T was a maximum of 72.2 A・m<sup>2</sup>/kg at 1.5 T, which was over 4 times larger than that annealed in a zero field. Meanwhile, the precipitation of non-ferromagnetic β-phase was suppressed by in-field annealing. Magnetic field-induced acceleration of ε-τ transformation and suppression of τ-β transformation were due to the gain of Zeeman energy of τ-phase.</p>

    DOI: 10.2320/jinstmet.J2018057

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  • Adline N. Nwodo, Ryota Kobayashi, Taoto Wakamori, Yoshihiro Matsumoto, Yoshifuru Mitsui, Rie Y. Umetsu, Masahiko Hiroi, Kohki Takahashi, Yoshiya Uwatoko, Keiichi Koyama .  Magnetic Phase Transition of Mn<inf>1.9</inf>Fe<inf>0.1</inf>Sb<inf>0.9</inf>Sn<inf>0.1</inf> .  IEEE Magnetics Letters9   1400204   2018.10Reviewed

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    © 2010-2012 IEEE. The magnetic properties of ferrimagnetic Mn1.9Fe0.1Sb0.9Sn0.1 with a Cu 2Sb-type tetragonal structure were investigated in the temperature range 10 to 360 K and in magnetic fields up to 5 T. The lattice parameters a and c were estimated to be 0.407 and 0.655 nm, respectively, at 293 K. The saturation magnetization at 10 K was 39.1 A m2/kg (1.62 μB per formula unit), which was slightly smaller than the value at 75 K, and the magnetization showed thermal hysteresis between 70 and 230 K. The compound showed a first-order magnetic transition from the ferrimagnetic to a paramagnetic-like state with a thermal hysteresis in the vicinity of 320 K. The results are discussed on the basis of the ferrimagnetic and antiferromagnetic transitions and spin reorientation.

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  • Hayato Masumitsu, Soshi Yoshinaga, Yoshifuru Mitsui, Rie Y. Umetsu, Masahiko Hiroi, Yoshiya Uwatoko, Keiichi Koyama .  Cu-substitution effects on the magnetic properties of weak itinerant electron ferromagnet CrAlGe .  AIP Advances8 ( 10 ) 101426   2018.10Reviewed

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    © 2018 Author(s). Cu-substitution effects on ferromagnetism in Cr-base ternary alloy CrAlGe with an orthorhombic TiSi2-type structure was investigated. The lattice parameters of Cr0.95Cu0.05AlGe were a = 4.748 Å, b = 8.209 Å and c = 8.696 Å at room temperature. The spontaneous and effective moment were determined to be ps = 0.533 μB/f.u at 5 K and peff = 1.89 μB/f.u, respectively. The Curie temperature TC was estimated to be 108 K. These ps and TC of Cr0.95Cu0.05AlGe were larger than those of CrAlGe and Ti-substituted compound. The peff/ps was determined to be 3.55, which was smaller than that of CrAlGe and Ti-substituted compound. Obtained results suggest that the substitution of Cu for Cr in CrAlGe leads suppression of its weak itinerant electron ferromagnetism.

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  • Kohei Noguchi, Hayato Masumitsu, Yoshifuru Mitsui, Rie Y. Umetsu, Masahiko Hiroi, Yoshiya Uwatoko, Keiichi Koyama .  Magnetic properties of Mn<inf>1-x</inf>TM<inf>x</inf>AlGe (TM = V, Fe, Cu) with Cu<inf>2</inf>Sb-type structure .  AIP Advances8 ( 10 ) 101433   2018.10Reviewed

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    © 2018 Author(s). The magnetic properties of Mn1-xTMxAlGe (TM = V, Fe and Cu) were investigated for x ≤ 0.2. The spontaneous magnetization decreased with increasing x. A remarkable decrease in the Curie temperature TC was observed for TM = Fe. For ferromagnetic MnAlGe (x = 0) and TM = nonmagnetic Cu (x = 0.2), Curie-Weiss law was confirmed. The compounds with TM = V and Fe (x = 0.2) did not show Curie-Weiss law, and the data of reciprocal susceptibility vs. temperature bent, indicating change of the magnetism from ferromagnetism. Obtained results suggested that the magnetic moments of V and Fe were aligned antiparallel to those of Mn, resulting in the ferrimagnetism-like behavior.

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  • Yuri Okubo, Syoichi Eto, Yoshifuru Mitsui, Keiichi Koyama, Shinpei Fujii .  Ab initio investigation of Fe substitution effect on magnetostructural transition of CoMnGe .  AIP Advances8 ( 10 ) 101432   2018.10Reviewed

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    © 2018 Author(s). First-principles calculations for the ferromagnetic systems (Co,Fe)MnGe and Co(Mn,Fe)Ge show the hexagonal cell volume decreases as an amount of Fe increases mainly because of the reduction of the lattice constant c. The Fe substitution produces a reduction in the distance between adjacent atoms along the direction of the c axis and an increase in charge density between those atoms. This enhancement of the covalent bond is responsible for the hexagonal-structure stabilization or a decrease of the structural transition temperature from hexagonal to orthorhombic phases.

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  • Yoshifuru Mitsui, Yoshihiro Matsumoto, Yoshiya Uwatoko, Masahiko Hiroi, Keiichi Koyama .  Magnetic relaxation dynamics in thermally arrested Cr-modified Mn<inf>2</inf>Sb .  Journal of Magnetism and Magnetic Materials461   62 - 68   2018.9Reviewed

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    © 2018 Elsevier B.V. The magnetic phase transitions and their thermal transformation arrest (TTA) behavior of Cr-substituted Mn2Sb were investigated. Mn1.92Cr0.08Sb showed the first-order magnetic transition between antiferromagnetic (AFM) and ferrimagnetic (FRI) state. The TTA phenomenon was observed in field-cooling process under magnetic field of μ0H ≥ 4 T. The relaxation process from the arrested FRI to AFM state was explained by stretched exponential function. As decreasing temperature, the magnetic relaxation changed from Arrhenius-type to non-Arrhenius ones. The characteristic relaxation time was evaluated to be the order of 105 ∼ 106 s, which indicated indeed arresting of the magnetic transition. During the process, the decrease in the magnetization due to the relaxation changed into an increase with the thermal fluctuation of ∼1%. These relaxation behaviors are explained by the density and the frequency of the reversal of triple-layered magnetic moments.

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  • Hayato Masumitsu, Soshi Yoshinaga, Yoshifuru Mitsui, Rie Y. Umetsu, Masahiko Hiroi, Yoshiya Uwatoko, Keiichi Koyama .  Magnetic and structural properties of Mn<inf>1−</inf><inf>x</inf>Cr<inf>x</inf>AlGe (0 ≤ x ≤ 1.0) .  Journal of Magnetism and Magnetic Materials456   104 - 107   2018.6Reviewed

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    © 2018 Elsevier B.V. The magnetic and structural properties of Mn1−xCrxAlGe (0 ≤ x ≤ 1.0) compounds were investigated. The spontaneous magnetization Ms and Curie temperature TC of Mn1−xCrxAlGe has a cusp at x = 0.2. The maximum values of Ms and TC are 1.74 μB/f.u. and 601 K, respectively. It was found that the tetragonal Cu2Sb-type structure was stable for 0 ≤ x ≤ 0.75, whereas orthorhombic TiSi2-type structure was observed for x ≥ 0.8. The reciprocal susceptibility as a function of temperature suggested that the magnetic moment of Cr is antiferromagnetically coupled with that of Mn in Cu2Sb-type structure.

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  • Yoshifuru Mitsui, Rie Y. Umetsu, Kohki Takahashi, Keiichi Koyama .  Reactive sintering process of ferromagnetic MnBi under high magnetic fields .  Journal of Magnetism and Magnetic Materials453   231 - 235   2018.5Reviewed

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    © 2018 Elsevier B.V. The magnetic field effect on the reactive sintering process of MnBi was investigated. Magnetic-field-induced enhancement of the reaction was found to be exhibited at the initial stages. The coercivity field decreased with an increase in the in-field annealing time. The kinetics of the reaction were in good agreement with the diffusion-controlled reaction model. It is suggested that the decrease in activation energy at the initial stages of reaction increased the amount of formed MnBi phases, resulting in enhancement of the reaction Mn + Bi to MnBi phase by in-field reactive sintering.

    DOI: 10.1016/j.jmmm.2018.01.026

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  • Soshi Yoshinaga, Yoshifuru Mitsui, Rie Y. Umetsu, Yoshiya Uwatoko, Keiichi Koyama .  Pressure effect on magnetic properties of weak itinerant electron ferromagnet CrAlGe .  Journal of the Physical Society of Japan87 ( 1 ) 014701   2018Invited Reviewed

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    © 2018 The Physical Society of Japan. The Pressure effect on the magnetic properties of the weak itinerant electron ferromagnet CrAlGe was investigated at pressures up to 1.0 GPa. The spontaneous magnetic moment ps and Curie temperature TC decreased with increasing applied pressure P. The pressure derivatives of ps and TC were dps=dP = -3.98 × 10-5 μB=MPa and dTC=dP = -6.58 × 10-3K=MPa, respectively. These obtained results are discussed on the basis of Takahashi's spin fluctuation theory for weak itinerant electron ferromagnets. The characteristic parameters T0 and TA increased with pressure.

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  • Adline N. Nwodo, Ryota Kobayashi, Taoto Wakamori, Yoshihiro Matsumoto, Yoshifuru Mitsui, Masahiko Hiroi, Kohki Takahashi, Rie Y. Umetsu, Yoshiya Uwatoko, Keiichi Koyama .  Quasi-first order magnetic transition mn in<inf>1.9</inf>fe<inf>0.1</inf>Sb<inf>0.9</inf>Sn<inf>0.1</inf> .  Materials Transactions59 ( 3 ) 348 - 352   2018Reviewed

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    © 2018 The Japan Institute of Metals and Materials. The magnetic and structural properties of ferrimagnetic (FRI) Mn1.9Fe0.1Sb0.9Sn0.1 with a Cu2Sb-type tetragonal structure were studied by magnetization and high field X-ray diffraction (XRD) measurements in 10 ≤ T ≤ 773 K and in magnetic fields μ0H up to 5 T. The lattice parameters a and c at 285 K were estimated to be 0.407 nm and 0.655 nm, respectively. The saturation magnetization at 10 K was determined to be 39.1 Am2/kg. It was observed that a first order magnetic transition (FOMT) with a thermal hysteresis occurred in the vicinity of 310 K under low magnetic fields. This FOMT disappeared easily by applying magnetic fields over 0.4 T.

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  • Masahira Onoue, Ryota Kobayashi, Yoshifuru Mitsui, Masahiko Hiroi, Kohki Takahashi, Akihiro Kondo, Koichi Kindo, Yoshiya Uwatoko, Keiichi Koyama .  Magnetic and structural properties of MnCoGe with minimal fe and sn substitution .  Materials Transactions59 ( 10 ) 1645 - 1650   2018Reviewed

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    © 2018 Japan Institute of Metals (JIM). All rights reserved. The magnetic and structural properties of MnCo0.92Fe0.08Ge1-xSnx (x = 0.02, 0.05, and 0.1) were investigated. A first-order magnetic transition was observed, which was accompanied by the martensitic transformation from a hexagonal Ni2In-Type to an orthorhombic TiNiSi-Type structure in the vicinity of 320K for x = 0.02 and 170K for x = 0.05 with thermal hysteresis of approximately 20 K. The magnetization of MnCo0.92Fe0.08Ge0.95Sn0.05 was estimated to be 102Am2 kg-1 in 5 T at 10 K. High field magnetization curves up to 55 T for MnCo0.92Fe0.08Ge0.95Sn0.05indicated the field-induced martensitic transformation. Mössbauer spectroscopy experiments revealed that Fe atoms occupied 79%85% in the Co-site and 21%15% in the Mn-site.

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  • Yoshifuru Mitsui, Keiichi Koyama, Makoto Ohtsuka, Rie Y. Umetsu, Ryosuke Kainuma, Kazuo Watanabe .  High field X-ray diffraction study for Ni<inf>46.4</inf>Mn<inf>38.8</inf>In<inf>12.8</inf>Co<inf>2.0</inf> metamagnetic shape memory film .  Metals7 ( 9 ) 364   2017.9Reviewed

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    © 2017 by the authors. Licensee MDPI, Basel, Switzerland. The transformation behaviors on metamagnetic shape memory Ni46.4Mn38.8In12.8Co2.0 film were investigated by X-ray diffraction experiments in the temperature up to 473 K and magnetic fields μ0H up to 5 T. The prepared film showed the parent phase with L21 structure at 473 K, and with preferred orientation along the 111 plane. The magnetic field induced reverse transformation was directly observed at T = 366 K, which was just around the reverse transformation starting temperature.

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  • Soshi Yoshinaga, Yoshifuru Mitsui, Rie Y. Umetsu, Yoshiya Uwatoko, Keiichi Koyama .  Magnetic properties of weak itinerant electron ferromagnet CrAlGe .  Journal of Physics: Conference Series868 ( 1 ) 012018   2017.7Reviewed

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    © Published under licence by IOP Publishing Ltd. Magnetic properties for CrAlGe with an orthorhombic TiSi2-type structure were investigated under ambient pressure and hydrostatic pressure. CrAlGe is ferromagnetic at the temperature below Curie temperature T C of 80 K and has the spontaneous magnetic moment p s of 0.41 μ B/f.u. at 5 K and the effective moment p eff of 1.89 μ B/f.u. under ambient pressure. For the temperature T below 30 K, the decrease in p s(T) 2/p s(5K)2 was proportional to T 2. However, the decrease in p s(T) 2/p s(5K)2 was proportional to T 4/3 for 30 K < T < T C. The ratio p eff/p s was consistent with the theoretical curve of the generalized Rhodes-Wohlfarth plot (Takahashi plot). Obtained results suggest that CrAlGe is a weak itinerant electron ferromagnet. By applying a high pressure of 1 GPa, T C decreased by approximately 10 K.

    DOI: 10.1088/1742-6596/868/1/012018

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  • Misaki Yamashita, Ken-ichi Abematsu, Kohki Takahashi, Yoshifuru Mitsui, Keiichi Koyama .  Development of a compact quenching furnace for use in high magnetic fields .  IEEE Magnetics Letters8   6501504   2017.1Development of a compact quenching furnace for use in high magnetic fields

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  • Soshi Yoshinaga, Shihou Miura, Takeshi Kanomata, Yoshifuru Mitsui, Keiichi Koyama .  Pressure effect on magnetism of weak itinerant electron ferromagnet Ni74.6Al25.4 .  IEEE Magnetics Letters8   1400403   2017.1Pressure effect on magnetism of weak itinerant electron ferromagnet Ni74.6Al25.4Reviewed

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  • Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama .  Effects of annealing temperature and magnetic field on the epsilon-tau phase transformation in Mn-Al alloys .  IEEE Magnetics Letters8   1400704   2017.1Effects of annealing temperature and magnetic field on the epsilon-tau phase transformation in Mn-Al alloysReviewed

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  • Taoto Wakamori, Yoshifuru Mitsui, Kohki Takahashi, Rie Y. Umetsu, Yoshiya Uwatoko, Masahiko Hiroi, Keiichi Koyama .  Thermal transformation arrest phenomena in Mn<inf>2</inf>Sb<inf>0.9</inf>Sn<inf>0.1</inf> .  IEEE Magnetics Letters8   1402404   2017Reviewed

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    © 2010-2012 IEEE. Magnetic and structural properties of Sn-substituted Mn2Sb were investigated. A first-order magnetic transition (FOMT) from a ferrimagnetic (FRI) to an antiferromagnetic state occurred between 100 and 200 K, which was accompanied by an iso-structural transformation. Upon cooling in 5 T, the residual FRI phase was observed even at 10 K, and the residual FRI phase slightly decreased with increasing time. The results indicate that the FOMT of Mn2Sb0.9Sn0.1 is arrested by applying a magnetic field.

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  • Daiki Miyazaki, Yoshifuru Mitsui, Rie Y. Umetsu, Kohki Takahashi, Satoshi Uda, Keiichi Koyama .  Enhancement of the phase formation rate during in-field solid-phase reactive sintering of Mn-Bi .  Materials Transactions58 ( 5 ) 720 - 723   2017Reviewed

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    ©2017 The Japan Institute of Metals and Materials. Microstructural analysis was performed for Mn-Bi prepared by in-field solid-phase reactive sintering, in order to investigate the origin of magnetic field effects on the reaction. The number of formed MnBi phase around Mn grain in 10 T was almost 3 times larger than that in a zero field. The results indicated that the magnetic field enhanced the phase formation rate of MnBi phase. Due to the enhancement of the phase formation rate, the fraction of MnBi phase was drastically increased by in-field annealing.

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  • Ryota Kobayashi, Yoshifuru Mitsui, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama .  Magnetic-field-induced acceleration of phase formation in τ-Mn-Al .  Materials Transactions58 ( 11 ) 1511 - 1518   2017Reviewed

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    © 2017 The Japan Institute of Metals and Materials. The phase formation of ferromagnetic L10-MnAl (τ-phase) was accelerated by annealing in magnetic field. With in-field annealing at 623 K, the magnetization of the τ-phase annealed at 15 T was a maximum of 72.2 A・m2/kg at 1.5 T, which is over 4 times larger than that annealed without an external magnetic field for the same annealing time. On the other hand, the transformation from τ-phase to β-phase was suppressed under magnetic field. The obtained bulk sample did not show magnetic anisotropy because of the ε-τ solid-state transformation. Obtained results suggested that magnetic field induced acceleration of transformation was due to the gain of Zeeman energy which increases the driving force of the ε-τ transformation.

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  • X.F. Miao, Y. Mitsui, A. Lulian Dugulan, L. Caron, N.V. Thang, P. Manuel, K. Koyama, K. Takahashi, N.H. van Dijk, E. Bruck .  Kinetic-arrest-induced phase coexistence and metastability in (Mn,Fe)2(P,Si) .  Physical Review B94   094426   2016.9Kinetic-arrest-induced phase coexistence and metastability in (Mn,Fe)2(P,Si)Reviewed

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  • Yoshihiro Matsumoto, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Masahiko Hiroi, Yoshifuru Mitsui, Keiichi Koyama .  Magnetic properties of Mn1.9Co0.1Sb under high pressure .  AIP conference proceedings1763   020005   2016.8Magnetic properties of Mn1.9Co0.1Sb under high pressureReviewed

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  • Ken-ichi Abematsu, Yoshifuru Mitsui, Atsushi Taira, Daiki Miyazaki, Akio Takaki, Rie Y. Umetsu, Kohki Takahashi, Keiichi Koyama .  Magnetic field effects on reactive sintering of MnBi .  AIP conference proceedings1763 - 020010   2016.8Magnetic field effects on reactive sintering of MnBiReviewed

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  • Taoto Wakamori, Yoshifuru Mitsui, Kohki Takahashi, Rie Y. Umetsu, Masahiko Hiroi, Keiichi Koyama .  High field X-ray diffraction measurements of Mn2Sb0.95Ge0.05 .  AIP conference proceedings1763 - 020006   2016.8High field X-ray diffraction measurements of Mn2Sb0.95Ge0.05Reviewed

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  • Kosuke Ozono, Yoshifuru Mitsui, Rie Y. Umetsu, Masahiko Hiroi, Kohki Takahashi, Keiichi Koyama .  Magnetic and structural properties of MnCo1-xFexGe (0≤x≤0.12) .  AIP conference proceedings1763   020003   2016.8Magnetic and structural properties of MnCo1-xFexGe (0≤x≤0.12)Reviewed

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  • Kosuke Ozono, Yoshifuru Mitsui, Masahiko Hiroi, Rie Y. Umetsu, Kohki Takahashi, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Keiichi Koyama .  Magnetic and structural properties of metamagnetic MnCo0.92Fe0.08Ge compound .  Materials Transactions57 ( 3 ) 316 - 320   2016.2Magnetic and structural properties of metamagnetic MnCo0.92Fe0.08Ge compoundReviewed

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    DOI: doi:10.2320/matertrans.M2015382

  • Daiki Miyazaki, Yoshifuru Mitsui, Ken-ichi Abematsu, Kohki Takahashi, Kazuo Watanabe, Satoshi Uda, Keiichi Koyama .  In-situ observation and differential thermal analysis of MnBi in high magnetic fields .  Physics Procedia75   1324 - 1331   2015.12In-situ observation and differential thermal analysis of MnBi in high magnetic fieldsReviewed

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    DOI: doi:10.1016/j.phpro.2015.12.148

    Other Link: http://www.sciencedirect.com/science/article/pii/S1875389215017873

  • Soshi Yoshinaga, Yoshifuru Mitsui, Rie Y. Umetsu, Keiichi Koyama .  Magnetic properties of Cr-based Ternary Compound CrAlGe .  Physics Procedia75   918 - 925   2015.12Magnetic properties of Cr-based Ternary Compound CrAlGeReviewed

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    DOI: doi:10.1016/j.phpro.2015.12.126

    Other Link: http://www.sciencedirect.com/science/article/pii/S1875389215017654

  • Yoshifuru Mitsui, Ken-ichi Abematsu, Rie Y. Umetsu, Kohki Takahashi, Keiichi Koyama .  Magnetic field effects on liquid-phase reactive sintering of MnBi .  Journal of Magnetism and Magnetic Materials400   304 - 306   2015.8Magnetic field effects on liquid-phase reactive sintering of MnBiReviewed

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    DOI: 10.1016/j.jmmm.2015.07.114

    Other Link: http://www.sciencedirect.com/science/article/pii/S0304885315304212

  • Yoshifuru Mitsui, Yuki Ikehara, Kohki Takahashi, Shojiro Kimura, Goro Miyamoto, Tadashi Furuhara, Kazuo Watanabe, Keiichi Koyama .  Fe-Fe3C binary phase diagram in high magnetic fields .  Journal of Alloys and Compounds632   251 - 255   2015.1Fe-Fe3C binary phase diagram in high magnetic fieldsReviewed

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  • Rie Y. Umetsu, Yoshifuru Mitsui, Isamu Yuito, Teruaki Takeuchi, Hiroshi Kawarada .  Substitution Effects of Cr or Fe on the Curie Temperature for Mn-based Layered Compounds MnAlGe and MnGaGe With Cu2Sb-Type Structure .  IEEE Transactions on Magnetics50 ( 11 ) 1001904   2014.11Substitution Effects of Cr or Fe on the Curie Temperature for Mn-based Layered Compounds MnAlGe and MnGaGe With Cu2Sb-Type StructureReviewed

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  • Yoshifuru Mitsui, Keiichi Koyama, Katsunari Oikawa, Kazuo Watanabe .  Magnetic field effect on the liquids boundary of Bi-Mn binary system .  AIP conference proceedings1618   269 - 272   2014.10Magnetic field effect on the liquids boundary of Bi-Mn binary system

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  • Yoshifuru Mitsui, Rie Y. Umetsu, Keiichi Koyama, Kazuo Watanabe .  Magnetic-field-induced enhancement for synthesizing ferromagnetic MnBi phase by solid-state reaction sintering .  Journal of Alloys and Compounds615   131 - 134   2014.7Magnetic-field-induced enhancement for synthesizing ferromagnetic MnBi phase by solid-state reaction sinteringReviewed

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  • 三井好古、池原佑基、高橋弘紀、渡辺和雄、小山佳一 .  強磁場中示差熱分析によるFe-Cのα-γ変態に対する強磁場効果 .  熱測定41 ( 2 ) 43 - 48   2014.6強磁場中示差熱分析によるFe-Cのα-γ変態に対する強磁場効果Reviewed

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  • Kazuki Ohtake, Yoshifuru Mitsui, Kohki Tahakashi, Reisho Onodera, Shojiro Kimura, Kazuo Watanabe, Keiichi Koyama .  X-ray diffraction measurements of the Fe-Rh alloy under high magnetic fields and at high temperatures .  IEEE Transactions on magnetics50 ( 1 ) 1001404   2014.1X-ray diffraction measurements of the Fe-Rh alloy under high magnetic fields and at high temperaturesReviewed

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  • Yoshifuru Mitsui, Yuki Ikehara, K. Watanabe, Eun Sang Choi, Eric C. Palm, Keiichi Koyama .  Thermal analysis on MnBi in high magnetic fields up to 45 T .  Journal of Korean Physical Society62 ( 12 ) 1769 - 1772   2013.6Thermal analysis on MnBi in high magnetic fields up to 45 TReviewed

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  • Yoshifuru Mitsui, Katsunari Oikawa, Keiichi Koyama, Kazuo Watanabe .  Thermodynamic assessment for Bi-Mn phase diagram in high magnetic fields .  Journal of Alloys and Compounds577   315 - 319   2013.6Thermodynamic assessment for Bi-Mn phase diagram in high magnetic fieldsReviewed

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  • Hiroki Orihashi, Masahiko Hiroi, Yoshifuru Mitsui, Kohki Takahashi, Kazuo Watanabe, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Keiichi Koyama .  Magnetic and structural properties of Mn1.8Co0.2Sb under magnetic fields .  Materials Transactions54 ( 6 ) 969 - 973   2013.5Magnetic and structural properties of Mn1.8Co0.2Sb under magnetic fieldsReviewed

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  • Kazuo Watanabe, Yoshifuru Mitsui, Keiichi Koyama .  Heat-treatment processing for MnBi in high magnetic fields .  Advances in Science and Technology78   19 - 24   2013.1Heat-treatment processing for MnBi in high magnetic fieldsReviewed

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  • Yoshifuru Mitsui, Keiichi Koyama, Kazuo Watanabe .  Bi-Mn binary phase diagram in high magnetic fields .  Materials Transactions54 ( 2 ) 242 - 245   2012.12Bi-Mn binary phase diagram in high magnetic fieldsReviewed

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  • 三井好古 .  強磁性体MnBiの強磁場中平衡状態の解明 .      2012.9強磁性体MnBiの強磁場中平衡状態の解明

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  • 折橋広樹、満永大輔、廣井政彦、三井好古、高橋弘紀、渡辺和雄、小山佳一 .  強磁場X線回折実験によるMn1.8Co0.2Sbの磁場中結晶評価 .  日本金属学会誌76   246 - 250   2012.4強磁場X線回折実験によるMn1.8Co0.2Sbの磁場中結晶評価Reviewed

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  • Yoshifuru Mitsui, Keiichi Koyama, Kohki Takahashi, Kazuo Watanabe .  Development of an X-ray diffraction camera used in magnetic fields up to 10 T .  Review of scientific Instruments82   125104   2011.12Development of an X-ray diffraction camera used in magnetic fields up to 10 TReviewed

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  • Katsunari Oikawa, Yoshifuru Mitsui, Keiichi Koyama, Koichi Anzai .  Thermodynamic assessment of the Bi-Mn system .  Materials Transactions52 ( 11 ) 2032 - 2039   2011.10Thermodynamic assessment of the Bi-Mn systemReviewed

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  • Keiichi Koyama, Yoshifuru Mitsui, Eun Sang Choi, Yuki Ikehara, Eric C. Palm, Kazuo Watanabe .  Change of the equilibrium state of ferromagnetic MnBi in high magnetic fields .  Journal of alloys and compounds509   L78 - L80   2011.1Change of the equilibrium state of ferromagnetic MnBi in high magnetic fieldsReviewed

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  • Yoshifuru Mitsui, Keiichi Koyama, Wataru Ito, Rie Y. Umetsu, Ryosuke Kainuma, Kazuo Watanabe .  Observation of reverse transformation in metamagnetic shape memory alloy Ni40Co10Mn34Al16 by high-field X-ray diffraction measurements .  Materials Transactions51 ( 9 ) 1648 - 1650   2010.7Observation of reverse transformation in metamagnetic shape memory alloy Ni40Co10Mn34Al16 by high-field X-ray diffraction measurementsReviewed

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  • Yoshifuru Mitsui, Keiichi Koyama, Kazuo Watanabe .  X-ray diffraction measurements in high magnetic fields and at high temperatures .  Science and technology of advanced materials10   14602   2009.5X-ray diffraction measurements in high magnetic fields and at high temperaturesReviewed

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  • 三井好古、小山佳一、渡辺和雄 .  強磁場・高温X線回折測定用試料電気炉の性能評価 .  日本磁気学会誌33 ( 2 ) 60 - 63   2009.2強磁場・高温X線回折測定用試料電気炉の性能評価Reviewed

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  • 三井好古、小山佳一、中森裕子、折茂慎一、渡辺和雄 .  強磁場下におけるMnBiの相転移 .  日本金属学会誌73 ( 1 ) 40 - 45   2009.1強磁場下におけるMnBiの相転移Reviewed

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  • Keiichi Koyama, Yoshifuru Mitsui, Kazuo Watanabe .  Magnetic and structural phase transitions of MnBi under high magnetic fields .  Science and technology of advanced materials9   24204   2008.5Magnetic and structural phase transitions of MnBi under high magnetic fieldsReviewed

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  • Keiichi Koyama, Yoshifuru Mitsui, Kohki Takahashi, Kazuo Watanabe .  X-ray powder diffraction camera for high-field experiments .  Journal of Physics: Conference Series156   12018   2008.1X-ray powder diffraction camera for high-field experimentsReviewed

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  • Keiichi Koyama, Tetsuya Onogi, Yoshifuru Mitsui, Yuko Nakamori, Shin-ichi Orimo, Kazuo Watanabe .  Magnetic phase transition of MnBi under high magnetic fields and high temperature .  Materials Transactions48 ( 9 ) 2414 - 2418   2007.8Magnetic phase transition of MnBi under high magnetic fields and high temperatureReviewed

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Books

  • Novel Structured Metallic and Inorganic Materials

    Yoshifuru Mitsui, Rie Y. Umetsu( Role: Joint author ,  Chapter 4. Mn-based ferromagnetic alloys)

    Springer  2019 

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    Total pages:620   Responsible for pages:82-87   Language:English Book type:Scholarly book

MISC

  • Selective Synthesis of Magnetic Materials by Reaction under Magnetic Fields Invited Reviewed

    MITSUI Yoshifuru, ONOUE Masahira, KOYAMA Keiichi

    Materia Japan   59 ( 8 )   422 - 428   2020

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Japan Institute of Metals and Materials  

    DOI: 10.2320/materia.59.422

    CiNii Books

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  • Preface to Special Issue on Soft Magnetic Materials for Power Electronics toward EV Society

    Mitsui Yoshifuru, Saito Yuta, Ube Takuji, Okada Shusuke, Chang Mark, Toyoki Kentaro, Harumoto Takashi, Hosokawa Akihide, Matsuura Masashi

    Materia Japan   62 ( 9 )   577 - 577   2023.9

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    Language:Japanese   Publisher:The Japan Institute of Metals and Materials  

    DOI: 10.2320/materia.62.577

  • 談話室 『生体磁気学』

    三井 好古

    まてりあ   61 ( 3 )   166 - 167   2022

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    Language:Japanese   Publishing type:Book review, literature introduction, etc.   Publisher:公益社団法人 日本金属学会  

    DOI: 10.2320/materia.61.000

  • 日本金属学会会報「まてりあ」60巻記念企画について

    井田 駿太郎, 宮部 さやか, 大塚 誠, 小柳 禎彦, 近藤 亮太, 齋藤 信雄, 佐々木 秀顕, 竹田 修, 田中 秀明, 三井 好古

    まてりあ   60 ( 1 )   40 - 40   2021

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    Publisher:公益社団法人 日本金属学会  

    DOI: 10.2320/materia.60.40

  • 見方・考え方 合金状態図:三浦憲司,福富洋志,小野寺秀博(共著) オーム社 2003年

    三井 好古

    まてりあ   60 ( 5 )   302 - 302   2021

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    Language:Japanese   Publishing type:Book review, literature introduction, etc.   Publisher:公益社団法人 日本金属学会  

    DOI: 10.2320/materia.60.302

  • 磁場中反応を利用した選択的磁性材料合成 Reviewed

    三井好古、尾上昌平、小山佳一

    まてりあ   59 ( 8 )   422 - 428   2020.8

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  • Preface to Special Issue on "Magnetostrictive Alloys and Their Application to Energy Harvesting"

    Harumoto Takashi, Fujieda Shun, Hosokawa Hiroyuki, Mitsui Yoshifuru, Umetsu Rie

    Materia Japan   59 ( 1 )   5 - 5   2020

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    Publisher:The Japan Institute of Metals and Materials  

    DOI: 10.2320/materia.59.5

  • 連載「思い出の教科書,この一冊!」

    上田 恭介, 宮崎 秀俊, 山本 剛久, 横山 賢一, 榎木 勝徳, 大塚 誠, 木口 賢紀, 齊藤 敬高, 竹田 修, 田中 秀明, 佃 諭志, 三井 好古

    まてりあ   59 ( 1 )   50 - 50   2020

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    Publisher:公益社団法人 日本金属学会  

    DOI: 10.2320/materia.59.50

  • 連載「"あのころ"のまてりあ」について

    井田 駿太郎, 齊藤 信雄, 三井 好古, 宮部 さやか, 小柳 禎彦, 佐々木 秀顕, 近藤 亮太, 竹田 修

    まてりあ   59 ( 4 )   212 - 212   2020

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    Language:Japanese   Publisher:公益社団法人 日本金属学会  

    DOI: 10.2320/materia.59.212

  • Development of an educational tool: experiments on light diffraction and interference for high school physics students

    濱崎貢, 山口光臣, CHEN Li, 小原益己, 三井好古, 小山佳一

    鹿児島大学理学部紀要(Web)   52   2019

  • Development of a simple educational tool of calorimetry for high school students

    浜崎貢, 山口光臣, CHEN Li, 小原益己, 三井好古, 小山佳一

    鹿児島大学理学部紀要(Web)   51   2018

  • An educational tool for visualizing acoustic phenomena and measuring velocity, frequency and wavelength of sound waves

    浜崎貢, 山口光臣, CHEN Li, 小原益己, 三井好古, 小山佳一

    鹿児島大学理学部紀要(Web)   51   2018

  • Reaction of the ferromagnetic materials in magnetic field and the development of the system for observing the magnetic field effects Reviewed

    Yoshifuru MITSUI, Keiichi KOYAMA

    52 ( 5 )   165 - 168   2015.10

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  • 強磁性材料の磁場中平衡状態図 Reviewed

    三井 好古

    まてりあ   54   522 - 525   2015.10

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本金属学会  

    DOI: 10.2320/materia.54.522

  • 強磁場中熱分析 -相平衡への強磁場効果- Reviewed

    三井好古、小山佳一、淡路智、渡辺和雄

    低温工学   49 ( 1 )   11 - 18   2014.1

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Presentations

  • Yoshifuru Mitsui, Yukinari Sueyoshi, Ryota Kobayashi, Keiichi Koyama   Crystal growth of ferromagnetic MnBi phase by in-magnetic-field liquid-solid reaction of Bi/Mn diffusion couples   International conference

    7th International Symposium on Frontiers in Materials Science  2024.1 

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    Event date: 2024.1

    Language:English   Presentation type:Poster presentation  

    Venue: Taiwan  

  • 三井 好古   Ni基およびMn基ホイスラー合金の相変態への強磁場熱処理効果   Invited

    日本磁気科学会分離・分析分科会、無機・金属分科会合同研究会  2023.12  日本磁気科学会分離・分析分科会、無機・金属分科会

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    Event date: 2023.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン  

  • Yoshifuru Mitsui, Ryota Kobayashi, Rie Y. Umetsu, Kohki Takahashi, Keiichi Koyama   Ordering behaviour of L21-Ni2MnAl Heusler alloy under high magnetic fields   International conference

    9th International Workshop on Materials Analysis and Processing in magnetic fields  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Poster presentation  

  • Yoshifuru Mitsui, Yumi Watanabe, Ryota Kobayashi, Rie Y. Umetsu, Kohki Takahashi Keiichi Koyama   Control of the reaction in Mn/Ga diffusion couple by high magnetic field   International conference

    The 11th Pacific Rim International Conference on Advanced Materials and Processing  2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju, Korea  

  • Yoshifuru Mitsui, Kohei Baba, Ryota Kobayashi, Masahira Onoue, Wataru Ito, Shunsuke Kuzuhara, Keiichi Koyama   Phase separation of Fe-Cu alloy by in-magnetic-field annealing probed by Mössbauer spectroscopy   International conference

    HYPERFINE 2023  2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Poster presentation  

    Venue:京都  

  • 三井 好古   強磁場固液反応による二元・三元化合物の合成制御   Invited

    日本鉄鋼協会九州支部/日本金属学会九州支部共催 2023年度秋季講演会  2023.10  日本鉄鋼協会九州支部・日本金属学会九州支部

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    Event date: 2023.10

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:鹿児島大学  

  • 三井好古, 竹原功康, 小林領太, 末吉由育, 佐々木巌, 小山佳一   MnPt/Biコンポジットの磁場中反応  

    第70回応用物理学会春季学術講演会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 三井好古, 馬場公平, 小林領太, 尾上昌平, 伊東航, 葛原俊介, 小山佳一   Fe-Cu合金の相分離に対する強磁場効果  

    日本金属学会2023年春期講演大会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Poster presentation  

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  • Yoshifuru Mitsui, Keiichi Koyama   Application of magnetic field for selective reaction in magnetic alloys   Invited International conference

    6th International symposium on Frontiers in Materials Science  2022.11 

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    Event date: 2022.11

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Observation of two-phase co-existence of ferromagnetic L21 phase and antiferromagnetic B2 phase in Ni2MnAl prepared by in-field annealing  

    2022.11 

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    Event date: 2022.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • The effect of cooling time on the magnetostructural transition in MnCo0.8Fe0.2Ge  

    2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  • Yoshifuru Mitsui, Hideto Tanaka, Masahira Onoue, Moriharu Nagano, Rie Y. Umetsu, Keiichi Koyama   Magnetic and Structural Properties of MnZnSb-FeZnSb system with Tetragonal Cu2Sb-type Structure   International conference

    29th International Conference on Low Temperature Physics  2022.8 

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    Event date: 2022.8

    Language:English   Presentation type:Poster presentation  

    Venue:Sapporo  

  • 三井好古、今辻早紀、尾上昌平、尾中朱莉、小林領太、小野寺礼尚、小山佳一   MnFeGeの結晶構造・磁気特性に及ぼす熱処理効果  

    日本金属学会170回講演大会  2022.3 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  • High magnetic field effects on synthesis of magnetic functional materials   Invited International conference

    Summit of Materials Science 2022 and GIMRT user meeting 2022  0222.3  KINKEN WAKATE

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    Event date: 2022.3

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:仙台 ハイブリッド  

  • 三井好古、小山佳一、小林領太、梅津理恵、高橋弘紀   Ni2MnAlのB2/L21 変態に及ぼす強磁場の影響  

    第15回日本磁気科学会年会  2021.11 

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島・ハイブリッド  

  • 三井好古、渡邊有美、小林領太、高橋弘紀、小山佳一   Mn/Ga拡散対の磁場中反応における磁場強度の影響  

    応用物理学会第82回秋季学術講演会  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  • 三井好古、尾上昌平、葛原俊介、伊東航、高橋弘紀、小山佳一   Fe-1wt.%Cu におけるCu析出に対する強磁場効果  

    日本鉄鋼協会第182回講演大会(2021年秋季)  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  • In-field annealing for precipitation of magnetic alloys   Invited

    日本磁気学会第45回学術講演会  2021.8 

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    Event date: 2021.8 - 2021.9

    Language:English  

    Venue:オンライン  

  • 三井好古、中川駿、渡邊有美、小山佳一   磁場中熱処理による磁性材料の分離・分析プロセス   Invited

    第26回磁気科学会研究会(分離・分析分科会)「磁場利用の最近の動向と磁気現象の実際」 

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    Event date: 2020.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

  • 三井好古、吉田健斗、小林領太、梅津理恵、小山佳一   Cr 基三元化合物CrZnSb の結晶構造および磁気特性  

    第81回応用物理学会秋期学術講演会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  • 三井好古、渡邊有美、小林領太、萩尾聡明、小山佳一   Mn-Ga の固液反応に対する磁場効果  

    第14回日本磁気科学会年会 

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    Event date: 2019.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • 中川駿、三井好古、小林領太、梅津理恵、高橋弘紀、小山佳一   Reduction of the crystallite size in Cu2MnAl alloys by in-field annealing  

    応用物理学会 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  • 三井好古、麓秀斗、小林領太、高橋弘紀、小山佳一   強磁場示差熱分析によるMn-Al基合金のε-τ変態の速度論的評価  

    日本金属学会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  • 三井好古、高永悠大、小林領太、小山佳一   hcp-MnAlの相安定性に対するC添加効果  

    応用物理学会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学  

  • 三井好古、小山佳一   定常強磁場プロセスによる強磁性材料の選択的合成  

    強磁場コラボラトリにおける物性研究の現状と展望 

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    Event date: 2018.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • 三井好古、萩尾聡明、小山佳一、高橋弘紀   強磁場下におけるFe-Ga固液反応  

    日本磁気科学会年会 

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    Event date: 2018.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • 三井好古、小林領太、高木観雄、梅津理恵、高橋弘紀、水口将輝、小山佳一   強磁場中熱処理した(Mn,Zn)-Alの磁気特性  

    応用物理学会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  • Yoshifuru Mitsui, Ryota Kobayashi, Akio Takaki, Yudai Takanaga, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama   In-field Annealing Effects on L10-(Mn,Zn)-Al and Mn-Al-C   International conference

    21st International Conference on Magnetism 

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    Event date: 2018.7

    Language:English   Presentation type:Poster presentation  

  • Yoshifuru Mitsui, Ryota Kobayashi, Yudai Takanaga, Akio Takaki, Keiichi Koyama, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi   Different Magnetic Field Effects on the ε−τ Phase Transformation between (Mn,Zn)-Al and Mn-Al-C   International conference

    International Conference on Magnetism  2018.7 

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    Event date: 2018.7

    Language:English   Presentation type:Poster presentation  

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  • 麓秀斗、小林領太、三井好古、高橋弘紀、伊藤昌和、小山佳一   hcp-MnAl合金の磁場中相変態  

    第65回応用物理学会春季学術講演会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学  

  • 三井好古、宮﨑泰樹、梅津理恵、高橋弘紀、宇田聡、小山佳一   反応焼結初期における MnBi の磁場効果  

    第12回日本磁気科学会年会 

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    Event date: 2017.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • Yoshifuru Mitsui, Ryota Kobayashi, Misaki Yamashita, Kohki Takahashi, Satoshi Uda, Keiichi Koyama   Quenching furnace used in high magnetic fields up to 19 T   International conference

    International Conference on Magneto-Science 2017 

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Reims, Frrance  

  • 三井好古、宮﨑泰樹、梅津理恵、高橋弘紀、宇田聡、小山佳一   磁場中反応プロセスにおけるMnBiの生成  

    応用物理学会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  • 三井好古、山下美咲、高橋弘紀、宇田聡、小山佳一   強磁場急冷炉の性能評価  

    日本金属学会2017年春期講演大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Poster presentation  

  • Misaki Yamashita, ○Yoshifuru Mitsui, Rie Y. Umetsu, Kohki Takahashi, Satoshi Uda, Keiichi Koyama   Performance test for the quenching furnace in high magnetic fields  

    第64回応用物理学会春季学術講演会 

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    Event date: 2017.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:パシフィコ横浜  

  • Yoshifuru Mitsui   High Field X-ray diffraction study for Mn-based functional magnetic materials   Invited International conference

    EMN Orlando Meeting on Caloric Materials 

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    Event date: 2016.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Orlando, Florida, USA  

  • Yoshifuru Mitsui, Yoshihiro Matsumoto, Masahiko Hiroi, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Keiichi Koyama   Thermal transformation arrest behavior of Mn2Sb-based compounds   International conference

    The fifth international conference on ferromagnetic shape more alloys 

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    Event date: 2016.9

    Language:English   Presentation type:Poster presentation  

  • Yoshifuru Mitsui, Ryota Kobayashi, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama   In-magnetic-field annealing for Mn-based alloys   International conference

    The 4thInternational conference of Asian Union of Magnetic Societies 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tainan, Taiwan  

  • Yoshifuru Mitsui, Ryota Kobayashi, Ken-ichi Abematsu, Rie Y. Umetsu, Kohki Takahashi, Masaki Mizuguchi, Keiichi Koyama   Selective crystallization in Mn-based alloys by in-field heat treatment   Invited International conference

    7th international workshop on materials analysis and processing in magnetic fields 

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    Event date: 2016.6

    Language:English   Presentation type:Oral presentation (invited, special)  

  • 三井好古, 小林領太, 梅津理恵, 高橋弘紀, 水口将輝, 高梨弘毅, 小山佳一   Mn-Al合金の磁場中熱処理温度と磁気特性  

    日本金属学会春季講演大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  • Yoshifuru Mitsui, Atsushi Taira, Daiki Miyazaki, Akio Takaki, Rie Y. Umetsu, Kohki, Takahashi, Keiichi Koyama   Magnetic-field-induced reaction in Bi-Mn alloys   International conference

    2nd International Symposium on Frontiers in Materials Science 

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    Event date: 2015.11

    Language:English   Presentation type:Oral presentation (general)  

  • Yoshifuru MITSUI, Yoshihiro MATSUMOTO, Kazuyuki MATSUBAYASHI, Yoshiya UWATOKO, Masahiko HIROI, Keiichi KOYAMA   Kinetic arrest behavior in Cr-substituted Mn2Sb   International conference

    International Conference on Magneto-Science 2015 

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    Event date: 2015.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Matsumoto, Nagano  

  • 三井好古, 吉永総志, 梅津理恵, 小山佳一   Cr基三元化合物CrAlGeの結晶構造及び磁気特性  

    日本金属学会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

  • Yoshifuru Mitsui, Ken-ichi Abematsu, Rie Y. Umetsu, Kohki Takahashi, Keiichi Koyama   Magnetic Field Effects on Reaction-Sintering of MnBi   International conference

    20th International Conference on Magnetism  20th International Conference on Magnetism

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    Event date: 2015.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:スペイン  

    国際学会

  • 三井好古、梅津理恵、安達義也、鹿又武   Ni2MnGaのマルテンサイト変態に対するPt置換効果  

    日本物理学会  日本物理学会

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    Event date: 2015.3

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京  

    国内学会

  • 三井好古   強磁性材料の強磁場中状態図   Invited

    低温工学・超電導学会「多次元拘束磁場の発生と物質応答に関する調査研究会」  低温工学・超電導学会「多次元拘束磁場の発生と物質応答に関する調査研究会」

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    Event date: 2014.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:大阪  

    研究会

  • 三井好古、アベ松賢一、梅津理恵、小山佳一、渡辺和雄   磁場中反応焼結によって作製したMnBiの磁気特性  

    第9回日本磁気科学会年会  第9回日本磁気科学会年会

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    Event date: 2014.11

    Language:Japanese  

    Venue:岐阜  

    国内学会

  • 三井好古、アベ松賢一、梅津理恵、小山佳一、渡辺和雄   MnBiの磁場中反応焼結に対する熱処理時間の影響  

    日本金属学会2014年秋季講演大会  日本金属学会2014年秋季講演大会

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    Event date: 2014.9

    Language:Japanese  

    Venue:愛知  

    国内学会

  • 三井好古、アベ松賢一、梅津理恵、小山佳一、渡辺和雄   強磁性MnBiの強磁場中合成過程  

    第75回応用物理学会秋季学術講演会  第75回応用物理学会秋季学術講演会

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    Event date: 2014.9

    Language:Japanese  

    Venue:北海道  

    国内学会

  • Yoshifuru Mitsui, Ken-ichi Abematsu, Rie Y. Umetsu, Kazuo Watanabe, Keiichi Koyama   In-field heat treatment effect for Mn-based ferromagnetic materials   International conference

    6th international workshop on materials analysis and processing in magnetic fields  6th international workshop on materials analysis and processing in magnetic fields

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    Event date: 2014.7

    Language:English  

    Venue:沖縄  

    国際学会

  • 三井好古、アベ松賢一、梅津理恵、小山佳一、渡辺和雄   強磁性MnBiの合成に対する磁場効果  

    平成26年度日本金属学会九州支部学術講演会  平成26年度日本金属学会九州支部学術講演会

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    Event date: 2014.6

    Language:Japanese  

    Venue:熊本  

    国内学会

  • Yoshifuru Mitsui, Rie Y. Umetsu, Takeshi Kanomata   Magnetic and Structural Properties of Mn2PtGa   International conference

    IEEE International Magnetics Conference 2014  IEEE International Magnetics Conference 2014

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    Event date: 2014.5

    Language:English  

    Venue:Germany  

    国際学会

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Intellectual Property

  • ワインの製造方法及びワインの汚染防止方法

    三井好古、高峯和則、小山佳一、末吉由育、小林領太

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    Application no:特願2021-22260  Date applied:2021.2

    Announcement no:特開2022-124550 

  • 物理学実験キット

    小山 佳一, ▲浜▼▲崎▼ 貢, 陳 麗, 三井 好古, 小原 益己, 山口 光臣

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    Applicant:国立大学法人 鹿児島大学

    Application no:特願2020-007200  Date applied:2020.1

    Announcement no:特開2021-113935  Date announced:2021.8

    J-GLOBAL

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  • Cu-Mn-Al系磁石の製造方法

    三井 好古, 小山 佳一, 中川 駿

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    Applicant:国立大学法人 鹿児島大学

    Application no:特願2019-231653  Date applied:2019.12

    Announcement no:特開2021-100065  Date announced:2021.7

    J-GLOBAL

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  • 金属酸化抑制具及び金属酸化抑制方法

    三井 好古, 小山 佳一, 小林 領太, 那須 気

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    Applicant:国立大学法人 鹿児島大学

    Application no:特願2019-075319  Date applied:2019.4

    Announcement no:特開2020-172686  Date announced:2020.10

    J-GLOBAL

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  • 希土類-鉄系磁性材料のリサイクル方法

    尾上昌平, 小山佳一, 三井好古

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    Applicant:国立大学法人 鹿児島大学

    Application no:特願2018-198213  Date applied:2018.10

    Announcement no:特開2020-66748  Date announced:2020.4

    Country of applicant:Domestic  

    J-GLOBAL

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  • MnBi系磁性材料の製造方法

    三井 好古, 小山 佳一

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    Applicant:国立大学法人 鹿児島大学

    Application no:特願2018-96877  Date applied:2018.5

    Announcement no:特開2019-203147  Date announced:2019.11

    J-GLOBAL

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  • Mn-Al-C系磁石の製造方法及びMn-Al-C系磁性焼結体

    三井 好古, 小山 佳一, 小林 領太

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    Applicant:国立大学法人 鹿児島大学

    Application no:特願2018-034070  Date applied:2018.2

    Announcement no:特開2019-147994  Date announced:2019.9

    J-GLOBAL

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  • アルコール製造装置、アルコール製造方法及びプログラム

    小山 佳一, 高峯 和則, 小林 領太, 三井 好古

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    Applicant:国立大学法人 鹿児島大学

    Application no:特願2016-143198  Date applied:2016.7

    Announcement no:特開2018-011551  Date announced:2018.1

    Patent/Registration no:特許6694611  Date registered:2020.5 

    J-GLOBAL

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  • Mn−Al永久磁石の製造方法及びMn−Al永久磁石

    三井好古、小林領太、小山佳一、梅津理恵、水口将輝

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    Application no:特願2016-41157  Date applied:2016.3

    Announcement no:特開2017-157738 

  • 焼酎の製造方法

    小山 佳一, 高峯 和則, 小林 領太, 三井 好古

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    Applicant:国立大学法人 鹿児島大学

    Application no:特願2015-112672  Date applied:2015.6

    Announcement no:特開2016-220652  Date announced:2016.12

    Patent/Registration no:特許6632021  Date registered:2020.1 

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  • 永久磁石の製造方法

    三井 好古, 梅津 理恵, 渡邉 和雄, 小山 佳一

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    Applicant:国立大学法人東北大学, 国立大学法人 鹿児島大学

    Application no:特願2013-197699  Date applied:2013.9

    Announcement no:特開2015-063725  Date announced:2015.4

    Patent/Registration no:特許第6213726号  Date issued:2017.9

    J-GLOBAL

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Research Projects

  • 強磁場反応促進を利用した磁性材料の規則度制御

    2020.4 - 2023.3

    科学研究費補助金  若手研究

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    Grant type:Competitive

  • 強磁場中分解反応促進効果解明のための、強磁場雰囲気反応炉の開発

    2020.4 - 2021.3

    池谷科学技術振興財団  池谷科学技術振興財団 研究助成 

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    Authorship:Principal investigator 

  • トランプエレメント除去のためのFe-Cu磁場中状態図の解明

    2019.4 - 2021.3

    日本鉄鋼協会  鉄鋼研究振興助成及び石原・浅田研究助成 

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    Authorship:Principal investigator  Grant type:Competitive

  • 強磁場中気相-固相反応解明のための、強磁場反応炉の製作

    2018.4 - 2019.3

    池谷科学技術振興財団  池谷科学技術振興財団 研究助成 

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    Authorship:Principal investigator  Grant type:Competitive

  • 磁場による焼酎酵母菌成長制御の研究

    2015.4 - 2017.3

    米盛誠心育成会  米盛誠心育成会 研究助成 

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    Authorship:Principal investigator 

  • Mn基機能性磁性体の相変化に対する磁場効果と磁場中合成の最適化に関する研究

    2014.4 - 2017.3

    科学研究費補助金  若手研究(B)

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