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Home > Introduction of our tenure-track faculties > Yamamoto Akiyasu

Introduction of our tenure-track faculties

Yamamoto Akiyasu

Affiliation Organization for Promotion of Tenure-track System / Institute of Engineering
Division Division of Advanced Applied Physics
Research field Superconducting Materials Science for Applications
Keyword(S)
Url http://www.tuat.ac.jp/~yamamoto/
Research experience

・2005.04-2008.03 JSPS Research Fellow DC1, Japan Society for the Promotion of Science
・2005.11-2006.03 Visiting Associate, University of Wisconsin-Madison (SV: Prof. David Larbalestier)
・2008.04-2010.01 JSPS Postdoctoral Fellow for Research Abroad, Japan Society for the Promotion of Science (at National High Magnetic Field Laboratory, Tallahassee, FL, USA; SV: Prof. David Larbalestier)
・2010.01-2015.06 Assistant Professor, Department of Applied Chemistry, University of Tokyo
・2011.10-2015.03 Principal Investigator, PRESTO (Hosono Devision), Japan Science and Technology Agency
・2015.07-present Associate Professor, Tokyo University of Agriculture and Technology

Educational background

・1999.04-2003.03 B.Sc. Department of Applied Chemistry, University of Tokyo
・2003.04-2005.03 M.Sc. Department of Applied Chemistry, University of Tokyo
・2005.04-2008.03 Ph.D. Department of Applied Chemistry, University of Tokyo (SV: Prof. Kohji Kishio)

Awards

・2005.3 Akira Fujishima Award for the Most Excellent Thesis in Applied Chemistry, University of Tokyo
・2005.9 Young Scientist Award for the Presentation of an Excellent Paper, Japan Society of Applied Physics
・2014.5 CSSJ Incentive Award for Young Scientist, Cryogenics and Superconductivity Society of Japan
・2017.4 Young Scientists' Prize in the 2017 Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

Selected papers and publications

・J. D. Weiss, A. Yamamoto, A. A. Polyanskii, R. B. Richardson, D. C. Larbalestier, and E. E. Hellstrom, "Demonstration of an iron-pnictide bulk superconducting magnet capable of trapping over 1 T", Superconductor Science & Technology 28, 112001 1-6 (2015).
・A. G. Bhagurkar, A. Yamamoto, N. Hari Babu, J. H. Durrell, A. R. Dennis and D. A. Cardwell, "Synthesis of highly connected bulk MgB2 by infiltration and growth", Superconductor Science & Technology 28, 015012 1-6 (2015).
・A. Yamamoto, A. Ishihara, M. Tomita and K. Kishio, "Permanent magnet with MgB2 bulk superconductor", Applied Physics Letters 105, 032601 1-4 (2014).
・A. A. Polyanskii, F. Kametani, D. Abraimov, A. Gurevich, A. Yamamoto, I. Pallecchi, M. Putti, C. Zhuang, T. Tan, and X. X. Xi , "Roles of intrinsic anisotropy and band pairbreaking effects on critical currents in tilted-c-axis MgB2 films probed by magneto-optical and transport measurements", Physical Review B 90, 214509 1-12 (2014).
・A. Yamamoto, H. Tanaka, J. Shimoyama, H. Ogino, K. Kishio, and T. Matsushita, "Towards the realization of higher connectivity in MgB2 conductors - in-situ or sintered ex-situ?", Japanese Journal of Applied Physics 51, 010105 1-6 (2012).
・J. H. Durrell, C.B. Eom, A. Gurevich, E. E. Hellstrom, C. Tarantini, A. Yamamoto, and D. C. Larbalestier, "The behavior of grain boundaries in the Fe-based superconductors", Reports on Progress in Physics 74, 124511 1-23 (2011).
・S. Lee, J. Jiang, C. T. Nelson, C. W. Bark, J. D. Weiss, C. Tarantini, H. W. Jang, C. M. Folkman, S. H. Baek, A. Polyanskii, D. Abraimov, A. Yamamoto, Y. Zhang, X. Q. Pan, E. E. Hellstrom, D. C. Larbalestier, C. B. Eom, "Template engineering of Co-doped BaFe2As2 single-crystal thin films", Nature Materials 9, 397-402 (2010).
・A. Yamamoto, J. Jaroszynski, C. Tarantini, L. Balicas, J. Jiang, A. Gurevich, D. C. Larbalestier, R. Jin, A. S. Sefat, M. A. McGuire, B. C. Sales, D. K. Christen, D. Mandrus, "Small anisotropy, weak thermal fluctuation, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2", Applied Physics Letters 94, 062511 1-3 (2009).
・A. Yamamoto, A. A. Polyanskii, J. Jiang, F. Kametani, C. Tarantini, F. Hunte, J. Jaroszynski, E. E. Hellstrom, P. J. Lee, A. Gurevich, D. C. Larbalestier, Z. A. Ren, J. Yang, X. L. Dong, W. Lu, Z. X. Zhao, "Evidence for two distinct scales of current flow in polycrystalline Sm and Nd iron oxypnictides", Superconductor Science & Technology 21, 095008 1-11 (2008).

Research Description

Superconducting magnets are used for systems such as MAGLEV train and medical MRI in which high magnetic field exceeding the limits of permanent ferromagnets are required.
Recently TAT and US National High Magnetic Filed Laboratory collaboration team demonstrated that a 1 cm diameter bulk iron-based superconductor could trap a magnetic field exceeding 1 Tesla. The iron-based superconducting polycrystalline bulk, which was made up of nano-scale (~100 nm) grains, exhibited uniform magnetic field distribution and high mechanical strength, both of which are essential for high field magnets.
The iron-based superconductors as well as Magnesium Diboride (MgB2) have several important advantages: the raw materials do not contain rare earth elements, the fabrication process is simple and inexpensive, and it is possible to cool them with a compact cryocooler. These advantages are expected to facilitate realizing powerful superconducting magnets that are compact, portable, and ubiquitous because standard ceramic fabrication processes can be applied, it is possible that similar strong magnets can be made with other high temperature materials. Thus superconducting nano polycrystalline bulk materials are expected to be the new standard for developing novel strong magnets.

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