Updated on 2025/03/28

写真a

 
HATANO Takafumi
 
Organization
Graduate School of Engineering Materials Physics 1 Associate professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Physical Science and Engineering
Title
Associate professor

Degree 1

  1. 博士(理学) ( 2010.3   東北大学 ) 

Research Interests 2

  1. thin films

  2. superconductivity

Research Areas 1

  1. Others / Others  / 応用物性

Professional Memberships 3

  1. The Physical Society of Japan

  2. The Japan Society of Applied Physics

  3. Americal Physical Society

 

Papers 44

  1. Structural analysis and transport properties of [010]-tilt grain boundaries in Fe(Se,Te) Reviewed International coauthorship

    Iida, K; Yamauchi, Y; Hatano, T; Walter, K; Holzapfel, B; Hänisch, J; Guo, ZM; Gao, HY; Shi, HS; Tokuta, S; Hata, S; Yamamoto, A; Ikuta, H

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   Vol. 25 ( 1 )   2024.12

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

    DOI: 10.1080/14686996.2024.2384829

    Web of Science

    PubMed

  2. Electrically induced insulator-to-metal transition in InP-based ion-gated transistor Reviewed

    Shimizu, S; Shioya, H; Hatano, T; Miwa, K; Oiwa, A; Ono, S

    SCIENTIFIC REPORTS   Vol. 14 ( 1 )   2024.12

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

    DOI: 10.1038/s41598-024-81685-4

    Web of Science

    PubMed

  3. High tolerance of the superconducting current to large grain boundary angles in potassium-doped BaFe<sub>2</sub>As<sub>2</sub> Reviewed

    Hatano, T; Qin, DY; Iida, K; Gao, HY; Guo, ZM; Saito, H; Hata, S; Shimada, Y; Naito, M; Yamamoto, A

    NPG ASIA MATERIALS   Vol. 16 ( 1 )   2024.8

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    Authorship:Lead author   Language:English  

    DOI: 10.1038/s41427-024-00561-9

    Web of Science

  4. Fabrication of microstrips of iron-based superconductor NdFeAs(O,H) Reviewed

    Yoshikawa, A; Hatano, T; Hibino, H; Imanaka, H; Ikuta, H

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 37 ( 8 )   2024.8

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

    DOI: 10.1088/1361-6668/ad5b24

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  5. Electric field-induced volume change in pyro-vanadate-phosphates: Toward an alternative actuator architecture Reviewed

    Takada, K; Shibutani, J; Yagi, K; Ikawa, F; Yokoyama, Y; Hirai, D; Okamoto, Y; Katayama, N; Umena, Y; Chavas, LMGH; Hatano, T; Fujita, A; Takenaka, K

    APPLIED PHYSICS LETTERS   Vol. 125 ( 4 )   2024.7

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

    DOI: 10.1063/5.0219429

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  6. Electroactive actuator composites using volume change induced by insulator-to-metal transition in VO<sub>2</sub> Reviewed

    Takenaka, K; Mizuno, Y; Shibutani, J; Kishida, K; Takada, K; Yagi, K; Yokoyama, Y; Katayama, N; Okamoto, Y; Hirai, D; Hatanó, T; Fujita, A

    APPLIED PHYSICS LETTERS   Vol. 123 ( 23 )   2023.12

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

    DOI: 10.1063/5.0175670

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  7. Theory of Josephson current on a lattice model of grain boundary in <i>d</i>-wave superconductors Reviewed

    Sakamori, T; Kashiwaya, S; Yano, R; Tanaka, Y; Hatano, T; Yada, K

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 36 ( 8 )   2023.8

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

    DOI: 10.1088/1361-6668/acdeaf

    Web of Science

  8. Thin film growth of Ba(Zn,Fe)(2)As-2 by molecular beam epitaxy Reviewed

    Ikegami R., Hatano T., Kiyozawa T., Ishida T., Tomizawa Y., Iida K., Ikuta H.

    THIN SOLID FILMS   Vol. 758   2022.9

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

    DOI: 10.1016/j.tsf.2022.139420

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  9. Electrical-field-induced insulator-to-metal transition in samarium monosulfides Reviewed

    Kishida, K; Shibutani, J; Hatano, T; Yokoyama, Y; Katayama, N; Okamoto, Y; Nakamura, Y; Kishida, H; Suzuki, HS; Takehana, K; Imanaka, Y; Takenaka, K

    APPLIED PHYSICS LETTERS   Vol. 121 ( 12 )   2022.9

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

    DOI: 10.1063/5.0108716

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  10. Microstructure, pinning properties, and aging of CSD-grown SmBa2Cu3O7-delta films with and without BaHfO3 nanoparticles Reviewed International coauthorship

    Haenisch Jens, Iida Kazumasa, Cayado Pablo, Erbe Manuela, Gruenewald Lukas, Hatano Takafumi, Okada Tatsunori, Gerthsen Dagmar, Awaji Satoshi, Holzapfel Bernhard

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 35 ( 8 )   2022.8

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

    DOI: 10.1088/1361-6668/ac7b4d

    Web of Science

  11. Inter- to intra-layer resistivity anisotropy of NdFeAs(O,H) with various hydrogen concentrations Reviewed

    Chen M. Y., Iida K., Kondo K., Haenisch J., Hatano T., Ikuta H.

    PHYSICAL REVIEW MATERIALS   Vol. 6 ( 5 )   2022.5

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

    DOI: 10.1103/PhysRevMaterials.6.054802

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  12. Approaching the ultimate superconducting properties of (Ba,K)Fe<sub>2</sub>As<sub>2</sub> by naturally formed low-angle grain boundary networks Reviewed International coauthorship

    Iida, K; Qin, DY; Tarantini, C; Hatano, T; Wang, C; Guo, ZM; Gao, HY; Saito, H; Hata, S; Naito, M; Yamamoto, A

    NPG ASIA MATERIALS   Vol. 13 ( 1 )   2021.10

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

    DOI: 10.1038/s41427-021-00337-5

    Web of Science

  13. Nanoscale Texture and Microstructure in a NdFeAs(O,F)/IBAD-MgO Superconducting Thin Film with Superior Critical Current Properties Reviewed

    Guo, ZM; Gao, HY; Kondo, K; Hatano, T; Iida, K; Hänisch, J; Ikuta, H; Hata, S

    ACS APPLIED ELECTRONIC MATERIALS   Vol. 3 ( 7 ) page: 3158 - 3166   2021.7

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

    DOI: 10.1021/acsaelm.1c00364

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  14. High <i>J</i><sub>c</sub> and low anisotropy of hydrogen doped NdFeAsO superconducting thin film

    Iida, K; Hänisch, J; Kondo, K; Chen, MY; Hatano, T; Wang, C; Saito, H; Hata, S; Ikuta, H

    SCIENTIFIC REPORTS   Vol. 11 ( 1 )   2021.3

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  15. Realization of epitaxial thin films of the superconductor K-doped BaFe<sub>2</sub>As<sub>2</sub> Reviewed

    Qin, DY; Iida, K; Hatano, T; Saito, H; Ma, YM; Wang, C; Hata, S; Naito, M; Yamamoto, A

    PHYSICAL REVIEW MATERIALS   Vol. 5 ( 1 )   2021.1

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

    DOI: 10.1103/PhysRevMaterials.5.014801

    Web of Science

  16. Metallic transport properties and electrostatic resistance modulations in LaNiO<sub>3</sub> ultrathin channels electrochemically etched in electric-double-layer transistors Reviewed

    Kan, D; Hatano, T; Abe, A; Ikuta, H; Shimakawa, Y

    APPLIED PHYSICS LETTERS   Vol. 117 ( 23 )   2020.12

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

    DOI: 10.1063/5.0028501

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  17. Thin film growth of CaAgAs by molecular beam epitaxy Reviewed

    Hatano, T; Nakamura, I; Ohta, S; Tomizawa, Y; Urata, T; Iida, K; Ikuta, H

    JOURNAL OF PHYSICS-CONDENSED MATTER   Vol. 32 ( 43 )   2020.10

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

    DOI: 10.1088/1361-648X/aba6a7

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  18. NdFeAs(O,H) epitaxial thin films with high critical current density Reviewed

    Kondo, K; Motoki, S; Hatano, T; Urata, T; Iida, K; Ikuta, H

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 33 ( 9 )   2020.9

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    Language:Japanese  

    DOI: 10.1088/1361-6668/aba353

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  19. Microfabrication of NdFeAs(O,F) thin films and evaluation of the transport properties Reviewed

    Tsuji, Y; Hatano, T; Kondo, K; Iida, K; Mawatari, Y; Ikuta, H

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 33 ( 7 )   2020.7

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

    DOI: 10.1088/1361-6668/ab8619

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  20. Anisotropy of the transport properties of NdFeAs(O,F) thin films grown on vicinal substrates Reviewed

    Iida, K; Matsumoto, T; Kondo, K; Hatano, T; Ikuta, H

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 33 ( 4 )   2020.4

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

    DOI: 10.1088/1361-6668/ab785c

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  21. Microscopic origin of highly enhanced current carrying capabilities of thin NdFeAs(O,F) films Reviewed

    Kauffmann-Weiss, S; Iida, K; Tarantini, C; Boll, T; Schneider, R; Ohmura, T; Matsumoto, T; Hatano, T; Langer, M; Meyer, S; Jaroszynski, J; Gerthsen, D; Ikuta, H; Holzapfel, B; Hänisch, J

    NANOSCALE ADVANCES   Vol. 1 ( 8 ) page: 3036 - 3048   2019.8

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

    DOI: 10.1039/c9na00147f

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  22. Grain boundary characteristics of oxypnictide NdFeAs(O,F) superconductors Reviewed

    Iida, K; Omura, T; Matsumoto, T; Hatano, T; Ikuta, H

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 32 ( 7 )   2019.7

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

    DOI: 10.1088/1361-6668/ab1660

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  23. Ambipolar suppression of superconductivity by ionic gating in optimally doped BaFe<sub>2</sub>(As, P)<sub>2</sub> ultrathin films Reviewed

    Piatti, E; Hatano, T; Daghero, D; Galanti, F; Gerbaldi, C; Guastella, S; Portesi, C; Nakamura, I; Fujimoto, R; Iida, K; Ikuta, H; Gonnelli, RS

    PHYSICAL REVIEW MATERIALS   Vol. 3 ( 4 )   2019.4

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

    DOI: 10.1103/PhysRevMaterials.3.044801

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  24. Novel method to study strain effect of thin films using a piezoelectric-based device and a flexible metallic substrate Reviewed

    Iida, K; Sugimoto, Y; Hatano, T; Urata, T; Langer, M; Holzapfel, B; Hänisch, J; Ikuta, H

    APPLIED PHYSICS EXPRESS   Vol. 12 ( 1 )   2019.1

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

    DOI: 10.7567/1882-0786/aaf6e6

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  25. Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O,F) thin film Reviewed

    Hänisch, J; Iida, K; Ohmura, T; Matsumoto, T; Hatano, T; Langer, M; Kauffmann-Weiss, S; Ikuta, H; Holzapfel, B

    MRS COMMUNICATIONS   Vol. 8 ( 4 ) page: 1433 - 1438   2018.12

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

    DOI: 10.1557/mrc.2018.207

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  26. Nonmonotonic and anisotropic magnetoresistance effect in antiferromagnet CaMn2Bi2 Reviewed

    Kawaguchi N., Urata T., Hatano T., Iida K., Ikuta H.

    PHYSICAL REVIEW B   Vol. 97 ( 14 )   2018.4

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

    DOI: 10.1103/PhysRevB.97.140403

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  27. Nonmonotonic and anisotropic magnetoresistance effect in antiferromagnet CaMn2Bi2

    Kawaguchi N., Urata T., Hatano T., Iida K., Ikuta H.

    PHYSICAL REVIEW B   Vol. 97   page: 140403   2018.4

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  28. Decoupling of critical temperature and superconducting gaps in irradiated films of a Fe-based superconductor

    Daghero Dario, Tortello Mauro, Ummarino Giovanni A., Piatti Erik, Ghigo Gianluca, Hatano Takafumi, Kawaguchi Takahiko, Ikuta Hiroshi, Gonnelli Renato S.

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 31 ( 3 )   2018.3

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

    DOI: 10.1088/1361-6668/aaa8b9

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  29. Effect of alpha-particle irradiation on a NdFeAs (O,F) thin film

    Tarantini C., Iida K., Sumiya N., Chihara M., Hatano T., Ikuta H., Singh R. K., Newman N., Larbalestier D. C.

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   Vol. 31 ( 3 )   2018.3

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

    DOI: 10.1088/1361-6668/aaa821

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  30. FABRICATION OF GRAIN BOUNDARY JUNCTIONS USING NdFeAs(O,F) SUPERCONDUCTING THIN FILMS

    Omura T., Matsumoto T., Hatano T., Iida K., Ikuta H.

    30TH INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS2017)   Vol. 1054   2018

  31. Hall effect measurements of high-quality Mn3CuN thin films and the electronic structure

    Matsumoto Toshiki, Hatano Takafumi, Urata Takahiro, Iida Kazumasa, Takenaka Koshi, Ikuta Hiroshi

    PHYSICAL REVIEW B   Vol. 96 ( 20 )   2017.11

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    DOI: 10.1103/PhysRevB.96.205153

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  32. Selective mass enhancement close to the quantum critical point in BaFe2(As1-xPx)(2)

    Grinenko V., Iida K., Kurth F., Efremov D. V., Drechsler S. -L., Cherniavskii I., Morozov I., Haenisch J., Foerster T., Tarantini C., Jaroszynski J., Maiorov B., Jaime M., Yamamoto A., Nakamura I., Fujimoto R., Hatano T., Ikuta H., Huehne R.

    SCIENTIFIC REPORTS   Vol. 7   2017.7

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

    DOI: 10.1038/s41598-017-04724-3

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  33. Effect of ion irradiation on surface morphology and superconductivity of BaFe2(As1-xPx)(2) films

    Daghero D., Tortello M., Gozzelino L., Gonnelli R. S., Hatano T., Kawaguchi T., Ikuta H.

    APPLIED SURFACE SCIENCE   Vol. 395   page: 9 - 15   2017.2

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

    DOI: 10.1016/j.apsusc.2016.07.016

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  34. Direct growth of superconducting NdFeAs(O,F) thin films by MBE Reviewed

    M. Chihara, N. Sumiya, K. Arai, A. Ichinose, I. Tsukada, T. Hatano, K. Iida, H. Ikuta

    Physica C: Superconductivity and its Applications   Vol. 518   page: 69   2015

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  35. 強相関酸化物における電界効果 Reviewed

    中野匡規、畑野敬史、澤彰仁、岩佐義宏

    固体物理   Vol. 49 ( 6 ) page: 381   2014

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    Authorship:Lead author   Language:Japanese  

  36. Highly textured oxypnictide superconducting thin films on metal substrates Reviewed

    K. Iida, F. Kurth, M. Chihara, N. Sumiya, V. Grinenko, A. Ichinose, I. Tsukada, J. Hanisch, V. Matias, T. Hatano, B. Holzapfel, and H. Ikuta

    Applied Physics Letters   Vol. 104   page: 023507   2014

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  37. Gate Control of Percolative Conduction in Strongly Correlated Manganite Films

    T. Hatano, Z. G. Sheng, M. Nakamura, M. Nakano, M. Kawasaki, Y. Iwasa, Y. Tokura

    Advanced Materials   Vol. 6   page: 2874   2014

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

    DOI: 10.1002/adma.201304813

  38. Electrically Tunable Anomalous Hall Effect in Pt Thin Films

    S. Shimizu, K. S. Takahashi, T. Hatano, M. Kawasaki,Y. Tokura,Y. Iwasa

    Physical Review Letters   Vol. 111   page: 216803   2013

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  39. Gate Control of ElectronicPhases in a Quarter-Filled Manganite

    T. Hatano, Y. Ogimoto, N. Ogawa, M. Nakano, S. Ono, Y. Tomioka, K. Miyano, Y. Iwasa, Y. Tokura

    Scientific Reports   Vol. 3   page: 2904   2013

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  40. Infrared-sensitive electrochromic device based on VO2

    M. Nakano, K. Shibuya, N. Ogawa, T. Hatano, M. Kawasaki, Y. Iwasa, Y. Tokura

    Applied Physics Letters   Vol. 103   page: 153503   2013

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  41. Collective bulk carrier delocalization driven by electrostatic surface charge accumulation

    M. Nakano, K. Shibuya, D. Okuyama, T. Hatano, S. Ono, M. Kawasaki, Y. Iwasa, Y. Tokura

    Nature   Vol. 487   page: 459   2012

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  42. Gate control of surface transport in MBE-grown topological insulator (Bi1-xSbx)2Te3 thin films

    S. Shimizu, R. Yoshimi, T. Hatano, K. S. Takahashi, A. Tsukazaki, M. Kawasaki, Y. Iwasa, Y. Tokura

    Physical Review B   Vol. 86   page: 045319   2012

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  43. Optical rectification effect in 1D metallic photonic crystal slabs with asymmetric unit cell

    T. Hatano, B. Nishikawa, M. Iwanaga, T. Ishihara

    Optics Express   Vol. 16   page: 8236   2009

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  44. Transverse Photo Voltage Induced by Circularly Polarized Light

    T. Hatano, T. Ishihara, S. G. Tikhodeev, N. A. Gippius

    Physical Review Letters   Vol. 103   page: 103906   2009

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Presentations 11

  1. 高温超伝導体多結晶体中の自然粒界に対する臨界電流特性評価手法の開発

    五味渕 太一、島田 和弥、畑野 敬史、石田 高史、長谷川 友大、山本 明保、飯田 和昌、生田 博志

    第72回応用物理学会春季学術講演会  2025.3.15 

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    Event date: 2025.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  2. X線吸収分光による鉄系超伝導体NdFeAs(O,H)薄膜の局所構造解析

    宮本 洸希、日比野 絢斗、吉川 淳朗、冨岡 隼也、鷲谷 伊吹、畑野 敬史、生田 博志

    第72回応用物理学会春季学術講演会  2025.3.15 

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    Event date: 2025.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  3. Grain boundaries in Fe(Se,Te) thin films Invited International coauthorship International conference

    J. Hänisch, K. Iida, K. Walter, S. Tokatlidis, Y. Yamauchi, T. Hatano, Z. Guo, H. Gao, H. Shi, S. Tokuta, B. Holzapfel, S. Hata, A. Yamamoto and H. Ikuta

    IBS2app 2025  2025.2.13 

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    Event date: 2025.2

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

  4. Fabrication and characterization of NdFeAs(O,H) nanostrips toward single photon detectors International conference

    Atsuro Yoshikawa, Shunya Tomioka, Ibuki Washitani, Koki Miyamoto, Daichi Aoki, Takafumi Hatano, Hiroshi Ikuta

    IBS2app 2025  2025.2.14 

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    Event date: 2025.2

    Language:English   Presentation type:Oral presentation (general)  

  5. H content dependence of the anisotropy of the upper critical field in NdFeAs(O,H) International conference

    Takafumi Hatano, Hiroto Hibino, Koki Miyamoto, Shunya Tomioka, Atsuro Yoshikawa, Hiroshi Ikuta

    37th International Symposium on Superconductivity 2024 (ISS2024)  2024.12.5 

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    Event date: 2024.12

    Language:English   Presentation type:Oral presentation (general)  

  6. 銅酸化物超伝導体GdBa2Cu3O7-δ薄膜の電気抵抗の異方性

    守永 昂世、畑野 敬史、生田 博志、飯田 和昌

    第85回応用物理学会秋季学術講演会  2024.9.17 

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    Event date: 2024.9

    Language:Japanese   Presentation type:Poster presentation  

  7. 鉄系超伝導体NdFeAs(O,H)の異方性の水素置換量依存性II

    畑野 敬史、日比野 絢斗、宮本 洸希、冨岡 隼也、吉川 淳朗、生田 博志

    第85回応用物理学会秋季学術講演会  2024.9.16 

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    Event date: 2024.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  8. NdFeAsO系超伝導薄膜のナノストリップ加工と超伝導特性評価

    吉川 淳朗、冨岡 隼也、鷲谷 伊吹、宮本 洸希、青木 大知、畑野 敬史、生田 博志

    第85回応用物理学会秋季学術講演会  2024.9.16 

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    Event date: 2024.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  9. 三段階プロセスによる(Nd, Sr)2NiO4薄膜のフッ素化及び物性評価

    小崎蒼太, 川原徹大, 浦田隆広, 飯田和昌, 畑野敬史, 生田博志

    日本物理学会 第79回年次大会  2024.9.18 

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    Event date: 2024.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  10. トポタクティック反応による鉄系超伝導体NdFeAs(O,H)薄膜の作製と物性評価

    第75回日本物理学会年次大会 

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    Language:Japanese   Presentation type:Oral presentation (general)  

  11. NdFeAs(O,F)およびNdFeAs(O,H)超伝導薄膜における 超伝導特性の比較

    畑野敬史

    2020年度日本物理学会秋季大会 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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Research Project for Joint Research, Competitive Funding, etc. 6

  1. マンガン窒化物を用いた温度無応答抵抗素子の開発

    2022.5

    立松財団研究助成 

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    Grant amount:\1500000

  2. マンガン窒化物を用いた温度安定性の高い次世代抵抗素子の実現

    2022.5

    日比科学技術振興財団  日比科学技術振興財団研究助成 

    畑野敬史

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\2000000

  3. 高い熱伝導率を示す新規III-V族半導体ヒ化ホウ素の薄膜作製

    2020.6

    村田学術振興財団  村田学術振興財団研究助成 

    畑野敬史

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    Authorship:Principal investigator  Grant type:Competitive

  4. 高い温度安定を示す高性能抵抗素子の開発

    2019.11

    住友財団基礎科学研究助成 

    畑野敬史

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    Grant type:Competitive

  5. 機能性薄膜材料における軽元素量の電界制御

    2016.4 - 2018.3

    挑戦的萌芽研究

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    Authorship:Principal investigator  Grant type:Competitive

  6. 電気二重層トランジスタを用いた鉄酸化物の酸化還元反応制御

    2014.4 - 2016.3

    若手研究(B)

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    Grant type:Competitive

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KAKENHI (Grants-in-Aid for Scientific Research) 5

  1. 30K以上の温度域で動作する鉄系超伝導体ベース単一光子検出器の開発

    Grant number:23H01444  2023.4 - 2026.3

    科学研究費助成事業  基盤研究(B)

    畑野 敬史, 生田 博志, 山下 太郎

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    Authorship:Principal investigator 

    Grant amount:\18590000 ( Direct Cost: \14300000 、 Indirect Cost:\4290000 )

    超伝導現象を活用した単一光子検出器(SPD)は、検出効率/検出精度/検出速度など多くの点で既存の半導体SPDを凌駕するため、量子暗号通信などにおけるキーデバイスとして期待されている。しかし超伝導SPDは、超伝導転移温度以下でしか機能しない。加えて薄膜化、微細加工によって転移温度が劣化するため、現行検出器の動作温度は極低温にとどまり、その超性能を活用することが困難である。以上を受け、鉄系高温超伝導体NdFeAs(O,H)に注目する。本系は50 Kを超える転移温度を示すだけでなく、他の超伝導体と比べて高い微細加工耐性を有する。本系の高品位極薄膜の作製と極微細化を実現し高温動作超伝導SPDを目指す。

  2. 30K以上の温度域で動作する鉄系超伝導体ベース単一光子検出器の開発

    Grant number:23K26138  2023.4 - 2026.3

    科学研究費助成事業  基盤研究(B)

    畑野 敬史, 生田 博志, 山下 太郎

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    Authorship:Principal investigator 

    Grant amount:\18590000 ( Direct Cost: \14300000 、 Indirect Cost:\4290000 )

    超伝導現象を活用した単一光子検出器(SPD)は、検出効率/検出精度/検出速度など多くの点で既存の半導体SPDを凌駕するため、量子暗号通信などにおけるキーデバイスとして期待されている。しかし超伝導SPDは、超伝導転移温度以下でしか機能しない。加えて薄膜化、微細加工によって転移温度が劣化するため、現行検出器の動作温度は極低温にとどまり、その超性能を活用することが困難である。以上を受け、鉄系高温超伝導体NdFeAs(O,H)に注目する。本系は50 Kを超える転移温度を示すだけでなく、他の超伝導体と比べて高い微細加工耐性を有する。本系の高品位極薄膜の作製と極微細化を実現し高温動作超伝導SPDを目指す。
    超伝導現象を活用した単一光子検出器(SPD)は、検出効率/検出精度/検出速度など多くの点で既存の半導体ベースSPDを凌駕する性能を有する。このため、先進通信技術である量子暗号通信の確立・普及に大きく寄与すると期待されている。超伝導SPDの動作温度を向上し、その汎用性を高めるために、転移温度の高い高温超伝導体薄膜ベースのSPD開発が重要である。本研究では50 Kを超えるTcを示す鉄系高温超伝導体NdFeAs(O,H)に注目し、本系の高品位極薄膜の作製と極微細化を実現することで、高温動作可能な超伝導型SPDを目指すものである。
    本年度の実績は以下である。まず薄膜作製については、薄膜表面に還元力の強い金属薄膜を蒸着してから熱処理を適切に実施することにより、金属膜が酸素ゲッターとして機能し、トポタクティック反応による水素化を効率よく進めるという独自手法を確立した。また対照実験により適切なmetal種の選定を実施したところ、AlおよびTiを用いることで効率的な処理が可能であることを明らかにした。さらに、Alを用いた場合、プロセス後に残留する表面のAl/Al2O3層は、適切な溶媒を用いて選択エッチングも可能であることも確認した。これにより、表面を劣化させることなく水素化薄膜が作製可能となった。次に微細加工については、反応性イオンエッチングによるミリングプロセスで生じるダメージの検討を行った。そのうえで、電子線リソグラフィによる本系の微細加工技術を確立し、200 nm線幅の加工まで実施可能であることを明らかにした。光子検出システムの立ち上げについては、NbN薄膜の成膜条件を整え、NbN薄膜の量産体制を確立し、テスト測定デバイスの作製と、専用パッケージの作成を実施した。
    まず、薄膜作製については、表面金属層の選択エッチング手法の確立、適切なmetal種の選定など、当初の予定通りの順調な進行である。これに加え、還元剤を様々に変えて実験していたところ、歩留まりの大幅向上や、当初想定していなかったフッ化プロセスへの展開につながる進展などが得られた。次に微細加工については、電子線リソグラフィを用いた微細加工は計画通りの進行である。これに加え、得られた試料の一部を断面組織観察したところ、表面保護層の活用により、当初は難しいと思われた極薄化が実現できていることを示唆する結果が得られ、当初予定していた以上の微細化・極薄化につながる進展が得られている。一方、光子検出システムの立ち上げについては、良質かつ均質なNbN薄膜を得る条件出しが完了し、テストデバイス用の微細加工に着手したものの、成膜装置の長期メンテナンスの影響等により、準備段階で止まっている。以上の結果を受け、おおむね順調に進捗していると判断される。
    薄膜作製については、適切な置換量選択が重要になると思われるため、再現性良く置換量をコントロールする手法の開発に取り組む。微細加工については、プロセス条件をさらに突き詰め、検出実験に備えて極細線線幅のメアンダ構造を15 um x 15 um程度の領域で加工することを目指す。光子検出実験については、NbNベースSPDでの光子検出実験のテスト完了・低温域で光子検出実験を行ってNdFeAsOデバイスの動作検証実験を目指す。最後に、対破壊電流にせまるバイアス印加により、2 マイクロメートル幅程度の比較的加工難度の低い構造でも単一光子検出が可能であるという報告が最近大きな注目を集めているため、これについても検討の上取り組む。

  3. Fundamental studies on the practical use of liquid helium-free, medium-temperature superconducting wires

    Grant number:20H02681  2020.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    IIDA Kazumasa

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    In this study, we have fabricated epitaxial thin films of the high-Tc iron-based superconductor NdFeAs(O,H), in which the oxygen site is partially replaced by hydrogen, and evaluated the physical properties of NdFeAs(O,H). As a result, NdFeAs(O,H) has higher superconducting properties (e.g. critical current density Jc, irreversibility field and low anisotropy), than NdFeAs(O,F). However, the decay of Jc with external magnetic fields was large, hence it is necessary to improve the in-field Jc. Although the inter-grain Jc has already begun to decay at a grain boundary angle of 6 degree, the absolute value was 6.2 MA/cm2, which is more than one order of magnitude higher than that in iron-based superconductors. Therefore, NdFeAs(O,H) is a suitable material for application among iron-based superconductors.

  4. Growth of high-quality thin films of the novel ZnAs-based magnetic semiconductors and improving the properties

    Grant number:17H02921  2017.4 - 2020.3

    Ikuta Hiroshi

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    Authorship:Coinvestigator(s) 

    We studied thin film growth of BaZn2As2, the mother compound of novel dilute magnetic semiconductors that are drawing considerable attention in recent years. The thin film growth of this compound had been possible only by a complex, five-step process until the start of the present study, while we have established a simple one-step growth method by means of molecular beam epitaxy. Thin films in which Fe was partially substituted for Zn were also grown. Transport measurements revealed that the partially Fe substituted films are n-type semiconductors, and the energy gap decreased with Fe content. The magnetization measurements showed that the Fe substituted films exhibit ferromagnetic behavior. Single crystals of compounds in which As was replaced by Sb or P were also grown, and the physical properties were studied. In particular, we observed a ferromagnetic behavior at room temperature for the Sb-based compound.

  5. field effect tuning of light elements in functional thin films

    Grant number:16K13684  2016.4 - 2018.3

    Hatano Takafumi

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    Authorship:Principal investigator 

    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    Some of functional materials contain light elements such as oxygen, nitrogen, fluorine. It is often found difficulty in the control of the amount of light elements in these material system.
    In this research, we aim to control the amount of light elements in materials by using a strong electric field generated in electric double layer transistors . We succeeded to induce the resistance changes by applying gate voltages, which seems to be attributable to changes of the amount of light elements in some materials, such as nitride thin films and iron based superconductors containing fluorine.

 

Teaching Experience (On-campus) 13

  1. Electronic Properties of Materials

    2024

  2. Fundamentals of Chemistry I

    2024

  3. Physical Science and Engineering Laboratory 1

    2024

  4. Physical Science and Engineering Laboratory 3

    2022

  5. Seminar on Materials Physics 1A

    2021

  6. 物理工学実験第1

    2020

  7. 電子物性工学特別実験および演習B

    2020

  8. 電子物性工学特別実験および演習A

    2020

  9. 電子物性工学セミナーID

    2020

  10. 電子物性工学セミナーIC

    2020

  11. 電子物性工学セミナーIB

    2020

  12. 電子物性工学セミナーIA

    2020

  13. 物理工学実験第2・3

    2020

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Media Coverage 2

  1. 名大・東京農工大・日大・九大、鉄系超伝導体(Ba,K)Fe2As2における粒界特性の特異性を発見 Internet

    日本経済新聞  2024.8

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    Author:Other 

  2. 名大・東京農工大・九大、鉄系高温超伝導体での超伝導電流で成果 Internet

    日本経済新聞  2021.10

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    Author:Other