Study of half-metallic Josephson devices for superconducting magnetoresistive random access memory
Project/Area Number |
16K04933
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Applied materials
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Research Institution | Kagoshima University |
Principal Investigator |
Shigeta Iduru 鹿児島大学, 理工学域理学系, 准教授 (30370050)
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Project Period (FY) |
2016-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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Keywords | スピントロニクス / ハーフメタル / ホイスラー合金 / 超伝導 / アンドレーエフ反射 / ジョセフソン効果 / 超伝導ゆらぎ / スピンエレクトロニクス / 超伝導材料・素子 / 低温物性 |
Outline of Final Research Achievements |
We have made layered films of superconducting NbN and half-metallic Heusler alloy Co2Fe0.4Mn0.6Si (CFMS). The fabrication conditions and device structures of half-metallic Josephson devices were optimized by extracting the physical parameters from transport measurements under magnetic fields. When a half-metallic layer was deposited on a superconducting layer, the coherence length and the diffusive coefficient increased, while the superconducting transition temperature and the critical field decreased. Based on the obtained results, we have fabricated NbN/CFMS/NbN structured devices and evaluated the properties of the half-metallic Josephson devices. In addition, we have developed the epitaxial contact Andreev reflection (ECAR) spectroscopy which can decide an intrinsic spin polarization. We succeeded in determining the spin polarization of Heusler alloy Co2FeSi.
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Academic Significance and Societal Importance of the Research Achievements |
ハーフメタルを電極材料としたスピントロニクス素子は,既存のエレクトロニクス素子の性能を凌ぐ次世代デバイスとして期待されている。また,超伝導デジタル回路の半導体回路に対する優位性は,ジョセフソン素子の高速性・低消費電力性と共に,無損失性という超伝導体本来の基本的な特性に基づくものである。 我々は,ハーフメタルと超伝導体を融合した系に注目して,ハーフメタル型ジョセフソン素子を創製するために,作製条件や構造を最適化した素子を作製し,その特性の評価に取り組んだ。得られた成果は,基礎研究ばかりでなく,超伝導磁気メモリへの応用など,新奇の超伝導スピントロニクス素子を創出するという意味においても重要である。
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Report
(5 results)
Research Products
(76 results)
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[Journal Article] Magnetic and electrical properties of Heusler compounds Ru2Cr1-xXxSi (X = V, Ti)2017
Author(s)
Masahiko Hiroi, Hiroaki Sano, Tomoya Tazoko, Iduru Shigeta, Masakazu Ito, Keiichi Koyama, Hirotaka Manaka, Norio Terada, Muneaki Fujii, Akihiro Kondo, Koichi Kindo
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Journal Title
Journal of Alloys and Compounds
Volume: 694
Pages: 1376-1382
DOI
Related Report
Peer Reviewed
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[Presentation] Magnetic properties of the L21-ordered phase in Co-based Heusler alloys Co2TiGa and Co2TiSn2019
Author(s)
Iduru Shigeta, Hayato Fundo, Ryutaro Ooka, Rie Y. Umetsu, Yoshio Miura, Akiko Nomura, Kunio Yubuta, Touru Yamauchi, Takeshi Kanomata, and Masahiko Hiroi
Organizer
Joint 5th International Symposium on Frontiers in Materials Science and 3rd International Symposium on Nano-materials, Technology and Applications (FMS-NANOMATA 2019)
Related Report
Int'l Joint Research
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[Presentation] ホイスラー合金Co2FeSiと超伝導体NbNのエピタキシャル素子を用いたアンドレーエフ反射分光法によるスピン分極率測定2017
Author(s)
重田出, 窪田崇秀, 桜庭裕弥, Cor G. Molenaar, Joost N. Beukers, 木村尚次郎, Alexander A. Golubov, Alexander Brinkman, 淡路智, 高梨弘毅, 廣井政彦
Organizer
日本物理学会2017年秋季大会
Related Report
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[Presentation] ホイスラー合金Co2FeSiのエピタキシャル接合アンドレーエフ反射分光2017
Author(s)
重田出, 窪田崇秀, 桜庭裕弥, Cor G. Molenaar, Joost N. Beukers, 木村尚次郎, Alexander A. Golubov, Alexander Brinkman, 淡路智, 高梨弘毅, 廣井政彦
Organizer
第123回日本物理学会九州支部例会
Related Report
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[Presentation] ホイスラー合金Co2TiGaの磁気特性2017
Author(s)
永元暢一, 大岡隆太郎, 重田出, 梅津理恵, 野村明子, 湯葢邦夫, 山内徹, 鹿又武, 真中浩貴, 寺田教男, 廣井政彦
Organizer
第123回日本物理学会九州支部例会
Related Report
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[Presentation] Spin polarization and magnetization of Heusler alloys Co2TiGa1-Snx (x = 1.0, 0.5)2016
Author(s)
Ryutaro Ooka, Yoshimi Sukino, Yutaro Fujimoto, Iduru Shigeta, Rie Y. Umetsu, Akiko Nomura, Touru Yamauchi, Takeshi Kanomata, Kunio Yubuta, Masahiko Hiroi
Organizer
The 4th International Conference of Asian Union of Magnetics Societies (IcAUMS 2016)
Place of Presentation
Tainan (Taiwan)
Year and Date
2016-08-01
Related Report
Int'l Joint Research