Kagoshima University · Graduate School of Science and Engineering · 教授

Research keywordsHeusler compounds・magnetisim・ホイスラー化合物・低温・磁性・low temperature physics・magnetism・スピン偏極・第一原理計算・磁気相転移

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• 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 Heusl2024 · 記述言語： 日本語 出版者・発行元： IEEE Transactions on Magnetics We present an analysis of the critical behavior of magnetization near the Curie temperature <italic>T</italic>_C in Heusler alloy Co₂TiGa_0.3Sn_0.7, 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 Co₂TiGa_0.3Sn_0.7 was investigated in the vicinity of <italic>T</italic>_C. The analysis of magnetic isotherms for Co₂TiGa_0.3Sn_0.7 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 Heusl2024 · 記述言語： 日本語 出版者・発行元： 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
• 廣井 政彦, 重田 出 . Mossbauer Spectroscopy of Magnetic Ordered Phases in Heusler Compounds Fe3-xMnxSi . the proceedings of LT29- 2023年 詳細を見る CiNii Research2023 · CiNii Research
• Critical Behavior of the Magnetization in Heusler Alloy Co2TiGa0.8Sn0.2 . IEEE Transactions on Magnetics58 ( 2 ) 2600404 2021年 詳細を見る 記述言語： 英語 掲載2021 · 記述言語： 英語 掲載種別： 研究論文（国際会議プロシーディングス） 出版者・発行元： 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

• Physical properties of Heusler compounds
• 銅サイト置換による高温超伝導体の超伝導・正常状態における銅スピン相関の変化の研究
• ウラン系化合物超伝導体の超伝導物性の研究
• 機能性発現を目指した磁性金属合金の強磁場中状態図

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