Updated on 2024/11/19

写真a

 
HIROI Masahiko
 
Organization
Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Department of Science Physics and Astronomy Program Professor
Abolition organization Physics and Astronomy Course
Title
Professor

Degree

  • 理学博士 ( 1989.3   京都大学 )

  • 理学修士 ( 1986.3   京都大学 )

  • 理学士 ( 1984.3   京都大学 )

Research Interests

  • スピントロニクス

  • 超伝導

  • 低温

  • 金属

  • 磁性

Research Areas

  • Nanotechnology/Materials / Metallic material properties

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

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   Professor

    2020.4

  • Kagoshima University

    1998.11

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

    1998.11 - 2020.3

Professional Memberships

  • 日本磁気学会

    2015.10

  • 米物理学会

    2015.10

  • 日本物理学会

    2015.10

  • 日本金属学会

    2015

 

Papers

  • Hiroi Masahiko, Nonoyama Tomohito, Shigeta Iduru, Yamauchi Touru .  Multiple Magnetic Phase Transitions in Fe3−xMnxSi Heusler Compounds .  Journal of the Physical Society of Japan90 ( 10 ) 103701 - 1-5   2021.10Reviewed

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

  • Masahiko Hiroi, Sora Nishiinoue, Iduru Shigeta, Masakazu Ito, Keiichi Koyama, Akihiro Kondo, Koichi Kindo, Isao Watanabe, Muneaki Fujii, Shojiro Kimura, Hirotaka Manaka, Norio Terada .  High magnetic field properties in Ru2-xFexCrSi with antiferromagnetic and spin-glass states .  Physical Review B103 ( 9 ) 094428 - 094428-12   2021.3Reviewed

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

    DOI： 10.1103/PhysRevB.103.094428

    Scopus

  • Magnetic properties of Heusler compound Fe1.3Mn1.7Si .  J. Phys.: Conf. Ser.969   012098-1 - 012098-6   2018.4Magnetic properties of Heusler compound Fe1.3Mn1.7SiReviewed

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

    DOI： https://doi.org/10.1088/1742-6596/969/1/012098

    Other Link： https://doi.org/10.1088/1742-6596/969/1/012098

  • Masahiko Hiroi, Hiroaki Sano, Tomoya Tazoko, Iduru Shigeta, Masakazu Ito, Keiichi Koyama, Hirotaka Manaka, Norio Terada, Muneaki Fujii, Akihiro Kondo, Koichi Kindo .  Magnetic and electrical properties of Heusler compounds Ru2Cr1-xXxSi (X = V, Ti) .  Journal of Alloys and Compounds694   1376 - 1382   2017.2Magnetic and electrical properties of Heusler compounds Ru2Cr1-xXxSi (X = V, Ti)Reviewed

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

    DOI： https://doi.org/10.1016/j.jallcom.2016.09.276

  • Masahiko Hiroi, Tomoya Tazoko, Hiroaki Sano, Iduru Shigeta, Keiichi Koyama, Akihiro Kondo, Koich Kindo, Hirotaka Manaka, Norio Terada .  High-field magnetization of Heusler compound Fe2Mn1-xVxSi .  Physical Review B95 ( 1 )   2017.1Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Review B  

    DOI： 10.1103/PhysRevB.95.014410

    Scopus

  • Masahiko Hiroi, Toru Hisamatsu, Takao Suzuki, Kazuki Ohishi, Yasuyuki Ishii, Isao Watanabe .  Muon spin relaxation study of spin-glass freezing in the Heusler compound Ru1.9Fe0.1CrSi .  Phys. Rev . B 88 ( 2 ) 24409   2013.7Muon spin relaxation study of spin-glass freezing in the Heusler compound Ru1.9Fe0.1CrSiReviewed

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  • Hiroi M., Takamoto T., Shigeta I., Onoue M. .  Mössbauer study of magnetically ordered states in Heusler compounds Fe3-xMnxSi .  Interactions245 ( 1 )   2024.4

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    It has been known that the Heusler compound Fe3-xMnxSi has a complex magnetic phase diagram. For 0.75 ≤x≤ 1.75, it exhibits a ferromagnetic transition at TC, and at a lower temperature TA, another transition to a phase with both ferromagnetic and antiferromagnetic components. Recently, however, magnetization and specific heat measurements revealed that for x= 1.7, yet another transition occurs at a temperature lower than TA, i.e., there are three transitions at zero magnetic field. In our previous study, the nature of the ordered phases and transitions for x= 1.7 and 1.68 were investigated using Mössbauer spectroscopy, and the existence of a hyperfine field Bhf was confirmed. This demonstrates that the low temperature phases are magnetically ordered phases. In this study, to further investigate the ordered phases and transitions in Fe3-xMnxSi, we measure Mössbauer spectra for x = 1.8 and 1.9, where only a single antiferromagnetic transition appears to exist as judged from magnetization measurements, and the transition temperature is defined as TA2′. The spectra show that Bhf is present for x= 1.8 and 1.9 at low temperatures, and the values of Bhf are comparable with that for x = 1.7. With increasing temperature T, Bhf decreases smoothly, and at T>TA2′ the spectrum becomes a singlet and Bhf is zero. These results confirm the existence of magnetic order for x = 1.8 and 1.9.

    DOI： 10.1007/s10751-024-01903-3

    Scopus

  • Aoshima H., Shigeta I., Nomura A., Yubuta K., Yamauchi T., Umetsu R.Y., Kanomata T., Hiroi M. .  The Critical Behavior of Magnetization near the Curie Temperature in Highly Spin-Polarized Heusler Alloy Co<sub>2</sub>TiGa<sub>0.3</sub>Sn<sub>0.7</sub> .  IEEE Transactions on Magnetics60 ( 9 )   2024

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    Language：Japanese   Publisher：IEEE Transactions on Magnetics  

    We present an analysis of the critical behavior of magnetization near the Curie temperature <italic>T</italic><sub>C</sub> in Heusler alloy Co<sub>2</sub>TiGa<sub>0.3</sub>Sn<sub>0.7</sub>, which is a promising candidate for highly spin-polarized materials that exhibit the characteristic properties of magnetic Weyl states. Weyl semimetals have garnered significant interest for their potential applications in spintronics devices, owing to their anomalous magnetoelectronic and magnetothermal properties. The magnetization of the synthesized Heusler alloy Co<sub>2</sub>TiGa<sub>0.3</sub>Sn<sub>0.7</sub> was investigated in the vicinity of <italic>T</italic><sub>C</sub>. The analysis of magnetic isotherms for Co<sub>2</sub>TiGa<sub>0.3</sub>Sn<sub>0.7</sub> reveals that the critical exponent &#x03B4; is deduced to be 5.16 in the high field region and 4.96 in the low field region. The obtained value of &#x03B4; deviates from the value of 3.0 expected by the conventional molecular field theory. However, it is in close agreement with the value of 5.0 predicted by the spin fluctuation theory for weak itinerant electron ferromagnets, exhibiting that the spin fluctuation theory is applicable even to highly spin-polarized Heusler alloys.

    DOI： 10.1109/TMAG.2024.3414430

    Scopus

  • Aoshima H., Shigeta I., Nomura A., Yubuta K., Yamauchi T., Umetsu R.Y., Kanomata T., Hiroi M. .  The Critical Behavior of Magnetization near the Curie Temperature in Highly Spin-Polarized Heusler Alloy Co<inf>2</inf>TiGa<inf>0.3</inf>Sn<inf>0.7</inf> .  2024 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2024 - Proceedings   2024

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    Language：Japanese   Publisher：2024 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2024 - Proceedings  

    We present an analysis of the critical behavior of magnetization near the Curie temperature TC in Heusler alloy Co2TiGa0.3Sn0.7, which is a promising candidate for highly spin-polarized materials that exhibit the characteristic properties of magnetic Weyl states. Weyl semimetals have garnered significant interest for their potential applications in spintronics devices, owing to their anomalous magnetoelectronic and magnetothermal properties. The magnetization of the synthesized Heusler alloy Co2TiGa0.3Sn0.7 was investigated in the vicinity of TC. The analysis of magnetic isotherms for Co2TiGa0.3Sn0.7 reveals that the critical exponent δ is deduced to be 5.16. The obtained value of δ deviates from the value of 3.0 expected by the conventional molecular field theory. However, it is in close agreement with the value of 5.0 predicted by the spin fluctuation theory for weak itinerant electron ferromagnets, exhibiting that the spin fluctuation theory is applicable even to highly spin-polarized Heusler alloys.

    DOI： 10.1109/INTERMAGShortPapers61879.2024.10576742

    Scopus

  • Hideki Aoshima, Iduru Shigeta, Jun Gouchi, Touru Yamauchi, Takeshi Kanomata, Rie Y. Umetsu, Yoshiya Uwatoko, Shinpei Fujii, Masahiko Hiroi .  Magnetic properties of highly spin-polarized Heusler alloy .  JPS Conference Proceedings38   011133   2023.5Magnetic properties of highly spin-polarized Heusler alloyReviewed

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

    DOI： https://doi.org/10.7566/JPSCP.38.011133

  • Kouki Akaishi, Iduru Shigeta, Masahiko Hiroi, Jun Gouchi, Yoshiya Uwatoko .  Effect of Pressure on the Magnetic Properties of Heusler Compound Fe1.3Mn1.7Si .  JPS Conference Proceedings38   011135   2023.5Effect of Pressure on the Magnetic Properties of Heusler Compound Fe1.3Mn1.7SiReviewed

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    Language：English  

    DOI： https://doi.org/10.7566/JPSCP.38.011135

  • Masahiko Hiroi, Kouki Akaishi, Tomohito Nonoyama, Iduru Shigeta, Masahira Onoue .  Mössbauer Spectroscopy of Magnetic Ordered Phases in Heusler Compounds Fe3−xMnxSi .  JPS Conference Proceedings38   011136   2023.5Mössbauer Spectroscopy of Magnetic Ordered Phases in Heusler Compounds Fe3−xMnxSiReviewed

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    Authorship：Lead author   Language：English  

    DOI： https://doi.org/10.7566/JPSCP.38.011136

  • Superconducting fluctuation effect on epitaxially layered films of superconductor NbN and half-metallic Heusler alloy Co 2 MnSi .    13 ( 2 ) 025116   2023.2Reviewed

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    Language：English   Publisher：AIP Advances  

    Superconducting properties were investigated in epitaxially layered films consisting of superconductor NbN and half-metallic Heusler alloy Co2MnSi (CMS). Temperature dependence of the electrical resistivity ρ(T) was measured by applying perpendicular magnetic fields to the surface of NbN/CMS films. With the increase of the CMS thickness dCMS, the upper critical field μ0Hc2 decreased monotonically, but the superconducting transition temperature Tc had the minimum of 10.1 K at dCMS ≈ 5 nm. The Tc behavior was in qualitative agreement with the theory of the π-coupling. The pair-breaking parameter δ determined by the superconducting fluctuation theory took the maximum at dCMS = 3 ∼5 nm, which would be related to the minimum of Tc. The experimental results reveal that the superconductivity of the NbN layer in NbN/CMS films is affected by the interplay between the superconducting NbN layer and the half-metallic CMS layer.

    DOI： 10.1063/9.0000584

    Scopus

  • Hiroi M., Nonoyama T., Shigeta I., Yamauchi T. .  Multiple magnetic phase transitions in Fe<inf>3−x</inf>Mn<inf>x</inf>Si heusler compounds .  Journal of the Physical Society of Japan90 ( 10 )   2021.10

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    Language：Japanese   Publisher：Journal of the Physical Society of Japan  

    Fe3−xMnxSi (x > 0.75) exhibits a ferromagnetic transition at TC and a transition to an antiferromagnetic phase with a ferromagnetic component at a temperature (TA) lower than TC, defined as the AF phase. Recently, in Fe1.3Mn1.7Si, another magnetic transition at a temperature lower than TA, defined as TA2, was observed. The phase below TA2 is referred to as the AF2 phase and is likely antiferromagnetic. This paper presents evidence for multiple phase transitions in Fe1.3Mn1.7Si obtained from specific heat and magnetization measurements. In addition, the magnetic transitions and magnetic properties of Fe3−xMnxSi (1.65 ≤ x ≤ 1.8) are investigated.

    DOI： 10.7566/JPSJ.90.103701

    Scopus

  • Soichiro Tsujikawa, Iduru Shigeta, Jun Gouchi, Takeshi Kanomata, Rie Y. Umetsu, Yoshiya Uwatoko, Masahiko Hiroi .  Magnetization of Quaternary Heusler Alloy CoFeCrAl .    58 ( 2 ) 2600505   2021Reviewed

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

    DOI： 10.1109/TMAG.2021.3096227

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  • Critical Behavior of the Magnetization in Heusler Alloy Co2TiGa0.8Sn0.2 .  IEEE Transactions on Magnetics58 ( 2 ) 2600404   2021Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE Transactions on Magnetics  

    We report the critical behavior of the magnetization in Heusler alloy Co2TiGa0.8Sn0.2 as a potential candidate of high spin-polarized materials with the characteristics of topological Weyl fermions. The Weyl semimetals are materials of great interest for applying spintronics devices, due to their unusual magnetoelectronic and magnetothermal properties. The magnetic properties of the synthesized Heusler alloy Co2TiGa0.8Sn0.2 are investigated around the Curie temperature TC. The magnetic isotherm measurements of Co2TiGa0.8Sn0.2 around TC exhibit that the critical exponent Δ is deduced to be 4.455(4) in high maximum applied field of 50 kOe and 4.823(9) in low maximum applied field of 10 kOe, respectively. Both Δ values are different from 3.0 derived by the conventional molecular field theory, but they are close to 5.0 predicted by the spin fluctuation theory for the itinerant electron ferromagnets. Possible origins for the discrepancy between experimental results and theoretical models are also discussed.

    DOI： 10.1109/TMAG.2021.3097164

    Scopus

  • Noguchi Kohei, Mitsui Yoshifuru, Hiroi Masahiko, Umetsu Rie Y., Gouchi Jun, Uwatoko Yoshiya, Koyama Keiichi .  Effects of Substituted Elements on Spin Reorientation in Mn<sub>2−</sub><i><sub>x</sub></i>Fe<i><sub>x</sub></i>Sb<sub>1−</sub><i><sub>y</sub></i>Sn<i><sub>y</sub></i> .  MATERIALS TRANSACTIONS61 ( 8 ) 1492 - 1495   2020Reviewed

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    Language：English  

    DOI： 10.2320/matertrans.MT-MN2019016

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  • Sera Masafumi, Yonemura Takumi, Itamochi Ken, Matsumura Takeshi, Hiroi Masahiko, Takahashi Kohki .  Not a Simple Ferro-quadrupole Order in DyB₆ .  Journal of the Physical Society of Japan88 ( 5 ) 54703 - 1-10   2019.5Reviewed

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  • T. Nonoyama, R. Kato, I. Shigeta, M. Hiroi, H. Manaka, N. Terada .  Magnetic transition in the Heusler compounds Fe3-xMnxSi .  AIP Advances8 ( 11 ) 115018-1 - 115018-5   2018.11Magnetic transition in the Heusler compounds Fe3-xMnxSiReviewed

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

    DOI： DOI: 10.1063/1.5080429

  • R. Kato, T. Nonoyama, R. Ooka, I. Shigeta, M. Hiroi .  Transport properties of Heusler compounds Fe3-xMnxSi (x = 1.6, 1.7 and 1.8) under magnetic fields .  AIP Advances8 ( 11 ) 115019-1 - 115019-4   2018.11Transport properties of Heusler compounds Fe3-xMnxSi (x = 1.6, 1.7 and 1.8) under magnetic fieldsReviewed

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

    DOI： DOI: 10.1063/1.5043075

  • Magnetic Phase Transition of Mn<inf>1.9</inf>Fe<inf>0.1</inf>Sb<inf>0.9</inf>Sn<inf>0.1</inf> .    9   １ - 4   2018.10Reviewed

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    Language：English  

    DOI： 10.1109/LMAG.2017.2768023

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  • M. Ito, K. Onda, A. Taira, K. Sonoda, M. Hiroi, and Y. Uwatoko .  Magnetic and thermodynamic properties of Heusler alloys Ni<inf>55</inf>Mn<inf>26</inf>Al<inf>19</inf> .  AIP Advances8 ( 5 ) 055712   2018.5Reviewed

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

    DOI： 10.1063/1.5007265

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  • Iduru Shigeta, Takahide Kubota, Yuya Sakuraba, Shojiro Kimura, Satoshi Awaji, Koki Takanashi, Masahiko Hiroi .  Transport properties of epitaxial films for superconductor NbN and half-metallic Heusler alloy Co<inf>2</inf>MnSi under high magnetic fields .    536   310 - 313   2018.5Reviewed

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    Language：English  

    DOI： 10.1016/j.physb.2017.09.074

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  • Thermodynamic properties of Heusler Fe<inf>2</inf>VSi .    8 ( 5 ) 055703   2018.5Thermodynamic properties of Heusler Fe<inf>2</inf>VSiReviewed

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  • Iduru Shigeta, Takahide Kubota, Yuya Sakuraba, Shojiro Kimura, Satoshi Awaji, Koki Takanashi, Masahiko Hiroi .  Transport properties of epitaxial films for superconductor NbN and half-metallic Heusler alloy Co2MnSi under high magnetic fields .  Physica B: Condensed Matter536   310 - 313   2018.5Transport properties of epitaxial films for superconductor NbN and half-metallic Heusler alloy Co2MnSi under high magnetic fieldsReviewed

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

    DOI： https://doi.org/10.1016/j.physb.2017.09.074

  • Temperature dependence of differential conductance in Co-based Heusler alloy Co2TiSn and superconductor .  Physica B: Condensed Matter536   289 - 292   2018.5Temperature dependence of differential conductance in Co-based Heusler alloy Co2TiSn and superconductorReviewed

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

    DOI： https://doi.org/10.1016/j.physb.2017.10.055

  • M Hiroi, S. Ishikuma, I. Shigeta, K. Koyama, A. Kondo, K. Kindo, H. Manaka, N. Terada .  Magnetization and magnetic phase diagram of Heusler compounds Fe3-y(Mn1-xVx)ySi (y =1 and 1.5) .  J. Phys.: Conf. Ser.969   012099-1 - 012099-6   2018.4Magnetization and magnetic phase diagram of Heusler compounds Fe3-y(Mn1-xVx)ySi (y =1 and 1.5)Reviewed

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

    DOI： https://doi.org/10.1088/1742-6596/969/1/012099

  • Shigeta I. .  Pressure effect on the magnetic properties of the half-metallic Heusler alloy Co2TiSn .  Physical Review B97 ( 10 ) 104414   2018.3Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Review B  

    DOI： 10.1103/PhysRevB.97.104414

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  • Iduru Shigeta, Takahide Kubota, Yuya Sakuraba, Cor G. Molenaar, Joost N. Beukers, Shojiro Kimura, Alexander A. Golubov, Alexander Brinkman, Satoshi Awaji, Koki Takanashi, Masahiko Hiroi .  Epitaxial contact Andreev reflection spectroscopy of NbN/Co2FeSi layered devices .  Appl. Phys. Lett.112   072402-1 - 072402-5   2018.2Epitaxial contact Andreev reflection spectroscopy of NbN/Co2FeSi layered devicesReviewed

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

    DOI： https://doi.org/10.1063/1.5007287

  • Quasi-First Order Magnetic Transition in Mn₁.₉Fe₀.₁Sb₀.₉Sn₀.₁ .  MATERIALS TRANSACTIONS59 ( 3 ) 348 - 352   2018Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：公益社団法人 日本金属学会  

    <p>The magnetic and structural properties of ferrimagnetic (FRI) Mn<sub>1.9</sub>Fe<sub>0.1</sub>Sb<sub>0.9</sub>Sn<sub>0.1</sub> with a Cu<sub>2</sub>Sb-type tetragonal structure were studied by magnetization and high field X-ray diffraction (XRD) measurements in 10 ≤ <i>T</i> ≤ 773 K and in magnetic fields μ<sub>0</sub><i>H</i> up to 5 T. The lattice parameters <i>a</i> and <i>c</i> 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 Am<sup>2</sup>/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.</p>

    DOI： 10.2320/matertrans.M2017291

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  • Magnetic and Structural Properties of MnCoGe with Minimal Fe and Sn Substitution .  MATERIALS TRANSACTIONS59 ( 10 ) 1645 - 1650   2018Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：公益社団法人 日本金属学会  

    <p>The magnetic and structural properties of MnCo<sub>0.92</sub>Fe<sub>0.08</sub>Ge<sub>1−x</sub>Sn<sub>x</sub> (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 Ni<sub>2</sub>In-type to an orthorhombic TiNiSi-type structure in the vicinity of 320 K for x = 0.02 and 170 K for x = 0.05 with thermal hysteresis of approximately 20 K. The magnetization of MnCo<sub>0.92</sub>Fe<sub>0.08</sub>Ge<sub>0.95</sub>Sn<sub>0.05</sub> was estimated to be 102 Am<sup>2</sup> kg<sup>−1</sup> in 5 T at 10 K. High field magnetization curves up to 55 T for MnCo<sub>0.92</sub>Fe<sub>0.08</sub>Ge<sub>0.95</sub>Sn<sub>0.05</sub> indicated 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.</p>

    DOI： 10.2320/matertrans.M2018183

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  • Ryutaro Ooka, Iduru Shigeta, Yoshimi Sukino, Yutaro Fujimoto, Rie Y. Umetsu, Yoshio Miura, Akiko Nomura, Kunio Yubuta, Touru Yamauchi, Takeshi Kanomata, Masahiko Hiroi .  Magnetization and Spin Polarization of Heusler Alloys Co2TiSn and Co2TiGa0.5Sn0.5 .  IEEE MAGNETICS LETTERS8   3101604   2017Magnetization and Spin Polarization of Heusler Alloys Co2TiSn and Co2TiGa0.5Sn0.5Reviewed

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  • Wakamori T. .  Thermal transformation arrest phenomena in Mn<inf>2</inf>Sb<inf>0.9</inf>Sn<inf>0.1</inf> .  IEEE Magnetics Letters8   2017

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    Publisher：IEEE Magnetics Letters  

    DOI： 10.1109/LMAG.2016.2628350

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  • Ooka R. .  Magnetization and Spin Polarization of Heusler Alloys Co<inf>2</inf>TiSn and Co<inf>2</inf> TiGa<inf>0.5</inf>Sn<inf>0.5</inf> .  IEEE Magnetics Letters8   2017

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    Publisher：IEEE Magnetics Letters  

    DOI： 10.1109/LMAG.2016.2623257

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  • Hiroi M. .  Magnetic and electrical properties of Heusler compounds Ru<inf>2</inf>Cr<inf>1−x</inf>X<inf>x</inf>Si (X = V, Ti) .  Journal of Alloys and Compounds694   1376 - 1382   2017

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    Publisher：Journal of Alloys and Compounds  

    DOI： 10.1016/j.jallcom.2016.09.276

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  • Qing Tao Meng, Shingo Komaki, Takuya Tsuneoka, Hirotoshi Hanada, Shohei Maeda, Taiki Murano, Fusao Ichikawa, Kikuo Itoh, Yuya Nishisako, Iduru Shigeta, Masahiko Hiroi .  Tunneling Spectroscopy of the Superconductor-Insulator Transition on Bi2Sr2Ca1-xYxCu2O8+δ and (Bi1-yPby)2Sr2Ca1-xYxCu2O8+δ .  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY24 ( 5 ) 7000504   2014.10Tunneling Spectroscopy of the Superconductor-Insulator Transition on Bi2Sr2Ca1-xYxCu2O8+δ and (Bi1-yPby)2Sr2Ca1-xYxCu2O8+δReviewed

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  • Masahiko Hiroi, Tomonari Higashiuchi, Takuro Ogawa, Iduru Shigeta, Masakazu Ito, Hirotaka Manaka, Norio Terada .  Substitution Effects in the Antiferromagnetic Heusler Compound Ru2CrSi .  JPS Conf. Proc.3   14024 - 6 pp.   2014.6Substitution Effects in the Antiferromagnetic Heusler Compound Ru2CrSiReviewed

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  • Sora Nishiinoue, Hidekazu Suwa, Iduru Shigeta, Masahiko Hiroi, Keiichi Koyama, Shojiro Kimura, Kazuo Watanabe, Muneaki Fujii .  Magneto-Transport Properties in the Heusler CompoundsRu2-xFexCrSi (0 ≤ x ≤ 0.1) .  JPS Conf. Proc.3   17018 - 6 pp.   2014.6Magneto-Transport Properties in the Heusler CompoundsRu2-xFexCrSi (0 ≤ x ≤ 0.1)Reviewed

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  • Hidekazu Suwa, Sora Nishiinoue, Kensuke Koseki, Iduru Shigeta, Masakazu Ito, Masahiko Hiroi, Hirotaka Manaka, Norio Terada .  Study on the Half-Heusler Compounds Co1+δTiSb with Excess Cobalt .  JPS Conf. Proc. 3   17017 - 6 pp.   2014.6Study on the Half-Heusler Compounds Co1+δTiSb with Excess CobaltReviewed

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

  • Iduru Shigeta, Yuya Nishisako, Shinpei Urakawa, Osamu Murayama, Masakazu Ito, Masahiko Hiroi .  Fabrication and Measurement of High-Temperature Superconductor YBa2Cu3O7-δ: Activity Report of Science Club .  JPS Conf. Proc. 1   17013 - 4 pp.   2014.3Fabrication and Measurement of High-Temperature Superconductor YBa2Cu3O7-δ: Activity Report of Science ClubReviewed

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

  • Yuki Yoshimine , Daisuke Mitsunaga , Hiroki Orihashi , Daisuke Shimada , Masahiko Hiroi, Reisho Onodera , Shojiro Kimura, Kohoki Takahashi, Keiichi Koyama .  Magnetic and Electrical Properties of Mn2-xNi1+xSb .  IEEE TRANS. MAG.50 ( 1 ) 1001204 - 4 pp.   2014.1Magnetic and Electrical Properties of Mn2-xNi1+xSbReviewed

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  • Yoshihiro Matsumoto, Hiroki Orihashi, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Masahiko Hiroi, Keiichi Koyama .  Magnetic Field Effect on Magnetic and Electrical Properties of Mn2-xCuxSb .  IEEE TRANS. MAG.50 ( 1 ) 1000704 - 4 pp.   2014.1Magnetic Field Effect on Magnetic and Electrical Properties of Mn2-xCuxSbReviewed

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  • Iduru Shigeta , Yuki Maeda , Kohei Harumori , Yuya Nishisako , Masakazu Ito , Touru Yamauchi, Masahiko Hiroi .  Spin Polarization Measurements of Heusler Alloy Ru0.2Fe1.8CrSi by Andreev Reflection Technique .  IEEE TRANS. MAG.50 ( 1 ) 1401304 - 4 pp.   2014.1Spin Polarization Measurements of Heusler Alloy Ru0.2Fe1.8CrSi by Andreev Reflection TechniqueReviewed

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  • Iduru Shigeta, Yuya Nishisako, Shinpei Urakawa, Osamu Murayama, Masakazu Ito, Masahiko Hiroi .  Fabrication and Measurement of High-Temperature Superconductor YBa2Cu3O7-δ: Activity Report of Science Club .  JPS Conf. Proc.1   17013   2014Fabrication and Measurement of High-Temperature Superconductor YBa2Cu3O7-δ: Activity Report of Science ClubReviewed

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  • Daisuke Shimada, Hiroki Orihashi, Daisuke Mitsunaga, Masakazu Ito, Masahiko Hiroi, Keiichi Koyama, Reisho Onodera, Kohki Takahashi, Kazuyuki Matsubayashi, Yoshiya Uwatoko .  Magnetic properties of Mn2Sb1-xGex (0.05 ? x ? 0.2) in high magnetic fields .  J. Korean Phys. Soc. 63 ( 3 ) 747 - 750   2013.8Magnetic properties of Mn2Sb1-xGex (0.05 ? x ? 0.2) in high magnetic fieldsReviewed

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  • Masakazu Ito, Toru Hisamatsu, Tsugumi Rokkaku, Osamu Murayama, Iduru Shigeta, Masahiko Hiro .  Thermodynamic and transport properties of Ru2-xFexCrSi(1.3 ?x ?1.8) .  J. Korean Phys. Soc. 62 ( 12 ) 2063 - 2067   2013.6Thermodynamic and transport properties of Ru2-xFexCrSi(1.3 ?x ?1.8)Reviewed

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  • Masahiko Hiroi, Kaori Uchida, Iduru Shigeta, Masakazu Ito, and Keiichi Koyama, Shojiro Kimura, Kazuo Watanabe .  Antiferromagnetic Transition in Ru2CrSi in Magnetic Fields .  J. Korean Phys. Soc. 62 ( 12 ) 2063 - 2067   2013.6Antiferromagnetic Transition in Ru2CrSi in Magnetic FieldsReviewed

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  • Takuo SAKON, Keiichi KOYAMA, Osamu KAMIYA, Satoshi AWAJI, Shintaro NAKAMURA, Tsutomu NOJIMA, Hiroyuki NOJIRI, Kazuo WATANABE, Masahiko HIROI .  High-Field Magnetization Measurements of Fe2MnSi .  Journal of the Physical Society of Japan 82 ( 4 ) 44802   2013.4High-Field Magnetization Measurements of Fe2MnSiReviewed

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  • I. Shigeta, Y. Sakuraba, S. Kimura, K. Koyama, K. Watanabe, K. Takahashi, M. Hiroi .  Transport and magnetic properties of fully-epitaxial superconducting NBN/half-metallic Heusler alloy Co2MnSi bilayer films .  J. Magn. Soc. Jpn.37 ( 42065 ) 222 - 226   2013Transport and magnetic properties of fully-epitaxial superconducting NBN/half-metallic Heusler alloy Co2MnSi bilayer filmsReviewed

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  • Hiroki Orihashi, Masahiko Hiroi, Yoshifuru Mitsui, Kohki Takahashi, Kazuo Watanabe, Kazuyuki Matsubayashi, Yoshiya Uwatoko, and Keiichi Koyama .  Magnetic and Structural Properties of Mn1.8CoMn0.2Sb under High Magnetic Fields .  Materials Transactions 54 ( 6 ) 969 - 973   2013Magnetic and Structural Properties of Mn1.8CoMn0.2Sb under High Magnetic FieldsReviewed

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  • Masahiko Hiroi, Iori Yano, Kenta Sezaki, Iduru Shigeta, Masakazu Ito, Hirotaka Manaka, Norio Terada .  Substitution Effect on the Magnetic Transitions of Fe2-xMnSi .  Journal of Physics - Conference Series400   32021   2012.12Substitution Effect on the Magnetic Transitions of Fe2-xMnSiReviewed

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  • Masahiko Hiroi, Haku Ko, Shingo Nakashima, Iduru Shigeta, Masakazu Ito, Hirotaka Manaka, Norio Terada .  Spin-glass and antiferromagnetic transitions in Ru2-xFexCrSi .  Journal of Physics - Conference Series400   32020   2012.12Spin-glass and antiferromagnetic transitions in Ru2-xFexCrSiReviewed

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  • Iduru Shigeta, Osamu Murayama, Toru Hisamatsu, Alexander Brinkman, Alexander A. Golubov, Yukio Tanaka, Masakazu Ito, Hans Hilgenkamp, Masahiko Hiroi .  Spin polarization of Fe-rich ferromagnetic compounds in Ru2-xFexCrSi Heusler alloys .  Journal of Physics and Chemistry in Solids72 ( 5 ) 604 - 607   2011.5Spin polarization of Fe-rich ferromagnetic compounds in Ru2-xFexCrSi Heusler alloysReviewed

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  • Masahiko Hiroi, Shingo Nakashima, Kohei Nakao, Tsugumi Rokkaku, Masakazu Ito, Iduru Shigeta, Hirotaka Manaka, Norio Terada .  Magnetic Properties of Ru-rich Ru2-xFexCrZ (Z= Si, Ge) .  Journal of Superconductivity and Novel Magnetism24   753 - 756   2011.1Magnetic Properties of Ru-rich Ru2-xFexCrZ (Z= Si, Ge)Reviewed

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  • Iduru Shigeta, Osamu Murayama, Toru Hisamatsu, Masakazu Ito, Masahiko Hiroi .  Measurements of spin polarization of Ru2-xFexCrSi Heusler alloys by Andreev reflection .  Physica C470   s806 - s807   2010.12Measurements of spin polarization of Ru2-xFexCrSi Heusler alloys by Andreev reflectionReviewed

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  • Masakazu Ito, Toru Hisamatsu, Tsugumi Rokkaku, Iduru Shigeta, Hirotaka Manaka, Norio Terada, Masahiko Hiroi .  Low-temperature magnetic properties of Heusler compounds Ru2-xFexCrSi (x=0.1, 0.3, and 0.5) .  Physical Review B82   024406 -1 - 024406 -7   2010.7Low-temperature magnetic properties of Heusler compounds Ru2-xFexCrSi (x=0.1, 0.3, and 0.5)Reviewed

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  • Masahiko Hiroi, Tsugumi Rokkaku, Kazuhisa Matsuda, Toru Hisamatsu, Iduru Shigeta, Masakazu Ito, Takuo Sakon, Keiichi Koyama, Kazuo Watanabe, Shintaro Nakamura, Tsutomu Nojima, Tomohito Nakano, Lin Chen, Tetsuya Fujiwara, Yoshiya Uwatoko, Hirotaka Manaka, Norio Terada .  Ferromagnetism and spin-glass transitions in the Heusler compounds Ru2-xFexCrSi .  Physical Review B79   224423 -1 - 224423 -10   2009.6Ferromagnetism and spin-glass transitions in the Heusler compounds Ru2-xFexCrSiReviewed

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  • Masahiko Hiroi, Tsugumi Rokkaku, Sou Mizutani, Sinpei Fujii, Shoji Ishida .  Magnetic properties and electronic structure of the Heusler compounds Ru2-xFexCrSi .  Journal of Physics - Conference Series150   042058 -1 - 042058 -4   2009.3Magnetic properties and electronic structure of the Heusler compounds Ru2-xFexCrSiReviewed

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  • Yusuke Kondo, Iori Yano, Iduru Shigeta, Masakazu Ito, Masahiko Hiroi, Hirotaka Manaka, Norio Terada .  Magnetic properties of the Heusler alloys Fe2-xCoxMnSi .  Journal of Physics - Conference Series150   042099-1 - 042099-4   2009.3Magnetic properties of the Heusler alloys Fe2-xCoxMnSiReviewed

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  • Masahiko Hiroi, Kazuhisa Matsuda, Tsugumi Rokkaku .  Magnetic properties and a metal-semiconductor crossover in Heusler compounds Ru2-xFexCrSi .  Physical Review B76 ( 13 ) 132401-1 - 132401-4   2007.10Magnetic properties and a metal-semiconductor crossover in Heusler compounds Ru2-xFexCrSiReviewed

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  • Kazuhisa Matsuda, Masahiko Hiroi and Masayuki Kawakami .  Magnetic properties of Heusler alloys Ru2-xFexCrSi .  Journal of Physics-Condensed Matter17 ( 37 ) 5889 - 5894   2005.9Magnetic properties of Heusler alloys Ru2-xFexCrSiReviewed

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MISC

  • μSRによるホイスラー化合物Ru1.9Fe0.1CrSiのスピングラス凍結についての研究

    廣井政彦

    めそん   39 ( 春 )   35 - 38   2014

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

  • ヘリウム液化装置

    廣井政彦, 小山 佳一, 伊藤 昌和, 重田出

    鹿児島大学理学部紀要   44   27 - 32   2011.12

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)  

Presentations

  • Mössbauer Study of Magentic Ordered States in Heusler Compounds Fe3-xMnxSi   International conference

    2023.11 

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    Event date： 2023.11

    Language：English   Presentation type：Poster presentation  

    Venue：奈良   Country：Japan  

  • 高本翼, 赤石幸起, 重田出, 廣井政彦, 郷地順, 上床美也   ホイスラー化合物Fe3−xMnxSi における磁気熱量効果  

    第128 回日本物理学会九州支部例会   2022.12  日本物理学会九州支部

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    Event date： 2022.12

    Language：Japanese  

    Venue：熊本大学  

  • 廣井政彦、野々山智仁、加藤遼太、重田出、木村尚次郎、近藤晃弘、金道浩一   ホイスラー化合物Ru1.9Fe0.1CrSiでの磁気抵抗のヒステリシス  

    日本物理学会第75回年次大会  日本物理学会

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    Event date： 2020.3

    Language：Japanese   Presentation type：Poster presentation  

    Venue：日本(遠隔）  

  • Masahiko Hiroi, Iduru Shigeta   Magnetic properties of Heusler compounds Fe3-xMnxSi   International conference

    the 26th assembly of Advanced Materials Congress 

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    Event date： 2019.6

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

    Venue：Stockholm, Sweden  

  • 廣井政彦、重田出、真中浩貴、寺田教男、野々山智仁、加藤遼太   Fe3-xMnxSiの磁気転移と磁場中電気抵抗  

    日本金属学会2019年春期（第164回）講演大会  日本金属学会

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    Event date： 2019.3

    Language：Japanese   Presentation type：Poster presentation  

    Venue：東京電機大学  

  • 廣井政彦、重田出、近藤晃弘、金道浩一   ホイスラー化合物Ru1.9Fe0.1CrSiの高磁場磁気抵抗  

    日本物理学会第74回年次大会  日本物理学会

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    Event date： 2019.3

    Language：Japanese   Presentation type：Poster presentation  

    Venue：九州大学  

  • T. Nonoyama, R. Kato, I. Shigeta, M. Hiroi, H. Manaka, N. Terada   Magnetic transition in the Heusler compounds Fe3-xMnxSi   International conference

    21st International Conference on Magnetism (ICM2018) 

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    Event date： 2018.7

    Language：English   Presentation type：Poster presentation  

    Venue：San Francisco、 USA  

  • R. Kato, T. Nonoyama, R. Ooka, I. Shigeta, M. Hiroi   Transport properties of Heusler compounds Fe3-xMnxSi (x = 1.6, 1.7 and 1.8) under magnetic fields   International conference

    21st International Conference on Magnetism (ICM2018) 

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    Event date： 2018.7

    Language：English   Presentation type：Poster presentation  

    Venue：San Francisco、 USA  

  • M. Hiroi, I. Shigeta, A. Kondo, K. Kindo   Anomalous hysteresis in magnetoresistance in Ru1.9Fe0.1CrSi under pulsed magnetic fields   International conference

    21st International Conference on Magnetism (ICM2018) 

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    Event date： 2018.7

    Language：English   Presentation type：Poster presentation  

    Venue：San Francisco、 USA  

  • Hiroi M, Nonoyama T., Adachi G., Shigeta I., Manaka H, Terada N   Magnetic properties of Heusler compound Fe1.3Mn1.7Si   International conference

    The 28th International Conference on Low Temperature Physics (LT28) 

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    Event date： 2017.8

    Language：English   Presentation type：Poster presentation  

    Venue：Gothenburg, Sweden  

  • M. Hiroi   Magnetic and electrical properties of the Heusler compounds Ru2-xFexCrSi   International conference

    EMN Meeting on Alloys and Compounds 

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    Event date： 2016.10

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

    Venue：Melbourne, Australia  

  • 廣井政彦, 西涼太, 田底知也, 佐野紘晃, 重田出, 伊藤昌和, 小山佳一, 近藤晃弘, 金道浩一   ホイスラー化合物Fe2Mn1-xVxSiの高磁場磁化と磁気相図  

    日本物理学会 第70回年次大会  日本物理学会 第70回年次大会

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    Event date： 2015.3

    Language：Japanese  

    Venue：東京  

  • H. Suwa, S. Nishiinoue, K. Koseki, I. Shigeta, M. Ito, M. Hiroi, H. Manaka, N. Terada   Study on the Half-Heusler Compounds Co1+δTiSb with Excess Cobalt   International conference

    The International Conference on Strongly Correlated Electron Systems  The International Conference on Strongly Correlated Electron Systems

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    Event date： 2013.8

    Language：English  

    Venue：東京  

  • S. Nishiinoue, H. Suwa, I. Shigeta, M. Hiroi, K. Koyama, S.Kimura, K.Watanabe, M.Fujii   Magneto-transport properties in the Heusler compounds Ru2-xFexCrSi (0 ? x ? 0.1)   International conference

    The International Conference on Strongly Correlated Electron Systems  The International Conference on Strongly Correlated Electron Systems

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    Event date： 2013.8

    Language：English  

    Venue：東京  

  • M. Hiroi, T. Higashiuchi, T. Ogawa, M. Ito, I. Shigeta, H. Manaka, N. Terada   Substitution Effects in the Antiferromagnetic Heusler Compound Ru2CrSi   International conference

    The International Conference on Strongly Correlated Electron Systems  The International Conference on Strongly Correlated Electron Systems

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    Event date： 2013.8

    Language：English  

    Venue：東京  

  • 廣井政彦、渡邊功雄 、川崎郁斗 、鈴木栄男、重田出、伊藤昌和   ホイスラー化合物Ru2-xFexCrSiの磁気転移  

    日本物理学会 第68回年次大会  日本物理学会 第68回年次大会

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    Event date： 2013.3

    Language：Japanese  

    Venue：広島  

  • Kouki Akaishi, Iduru Shigeta, Masahiko Hiroi, Jun Gouchi, Yoshiya Uwatoko   Effect of Pressure on the Magnetic Properties of Heusler Compound Fe1.3Mn1.7Si  

    29the International Conference on Low temperature physics   2023.8 

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