Updated on 2025/04/17

写真a

 
YAMADA KAZUMASA
 
Organization
Faculty of Engineering Sciences Department of Advanced Environmental Science and Engineering Associate Professor
Semiconductors and Devices Ecosystem Research and Education Center （Concurrent）
Interdisciplinary Graduate School of Engineering Sciences Department of Interdisciplinary Engineering Sciences（Concurrent）
School of Engineering （Concurrent）
Title
Associate Professor
Profile
2013-now spintronics 2008-2012 polymer 2005-200７ ferroelectrics 2001-2004 quantum dot 1995-2001 Superconductor x
Homepage
External link

Degree

  • Dr. Sc.

Research History

  • 科学技術振興事業団(NTT基礎研究所勤務) 2001年4月から2004年3月まで   

    科学技術振興事業団(NTT基礎研究所勤務) 2001年4月から2004年3月まで

Research Interests・Research Keywords

  • Research theme： The planar Hall effect of spin gapless semiconductor

    Keyword： spin gapless

    Research period： 2019.2 - 2022.4

  • Research theme： spintronics

    Keyword： spintronics

    Research period： 2013.4 - 2023.3

  • Research theme： conducting polymer

    Keyword： conducting polymer

    Research period： 2008.4 - 2013.3

  • Research theme： photoconductivity of Indium Zinc oxide film

    Keyword： photoconductivity, Indium Zinc oxide

    Research period： 2007.9 - 2010.3

  • Research theme： 強誘電体薄膜のレジスティブメモリー効果の緩和

    Keyword： 強誘電体

    Research period： 2005.12 - 2007.8

  • Research theme： 縦横型半導体量子ドットの輸送特性

    Keyword： 量子ドット

    Research period： 2001.4 - 2004.3

  • Research theme： グラニュラー超伝導膜のパーコレーション

    Keyword： 超伝導

    Research period： 1997.4 - 2001.3

  • Research theme： 超伝導多層膜薄膜の電子間相互作用

    Keyword： 超伝導

    Research period： 1995.4 - 1997.3

Papers

  • Temperature dependence of mobility of conducting polymer polyaniline with secondary dopant Reviewed International journal

    Kazumasa　Yamada, Bunju Shinozaki, Takashi Narikiyo, Yousuke Takigawa, Norihiro Kuroda, Toru Bando, Hiroaki Nakamura

    Synthetic Metals   247   124 - 130   2019.1

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

    The conductivity σ and carrier density n of the conducting polymer polyaniline were investigated by changing the concentration x of a secondary dopant, meta-cresol. We found that σ changes by four orders of magnitude within the x-range of 1–10%, while n, as estimated from the Hall measurements, shows a weak dependence on x in the region of 2% < x < 50%. These results suggest that σ can be enhanced by the change in the mobility μ. We analyzed the temperature dependence of μ by not only the combination of two different types of scattering mechanism, but also by the polaron hopping model. The experimental data of μ(T) can be explained well by the latter model with reasonable fitting parameter values of a small-polaron binding energy and a longitudinal optical phonon frequency.

    DOI： https://doi.org/10.1016/j.synthmet.2018.11.019

  • The temperature dependence of Hall mobility of the oxide thin film In2O3-ZnO

    K. Yamada, B. Shinozaki, K. Yano and H. Nakamura.

    Journal of Physics: Conference Series   400   042069   2012.12

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    Language：English  

    DOI： 10.1088/1742-6596/400/4/042069

  • Geometric blockade in a quantum dot coupled to two-dimensional and three-dimensional electron gases Reviewed International journal

    K. Yamada, M. Stopa, T. Hatano, T. Yamaguchi, T. Ota, Y. Tokura, S. Tarucha

    Physical Review B Rapid Communication   84   2011.11

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    Publishing type：Research paper (scientific journal)  

  • The Hall effect measurement in the high resistance In2O3-ZnO polycrystalline films Reviewed International journal

    K. Yamada, T. Yamaguchi, N. Kokubo, B. Shinokazi, K. Yano, H. Nakamura

    Transactions of the materials research society of Japan   34 ( 4 )   2009.12

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    Language：English  

  • Superconductivity in transparent Zinc-doped In2O3 films having low carrier density Reviewed International journal

    K. Makise, N. Kokubo, S. Takada, T. Yamaguti, S.Ogura, K. Yamada, B. Shinozaki, K. Yano, K. Inoue, and H. Nakamura

    Sci. Tech. Adv. Mater.   9 ( 4 )   044208   2008.5

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

    DOI： http://dx.doi.org/10.1088/1468-6996/9/4/044208

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Presentations

  • Magnetic properties and planar Hall effect of CoFeMnSi films International conference

    Kazumasa Yamada, Takashi Kimura, Kelvin Elphick, Marjan Samiepour and Atsufumi Hirohata

    2019 MMM Conference  2019.11 

    　More details

    Event date： 2019.11

    Language：English  

    Venue：Las Vegas   Country：United States  

    We systematically investigated the structural and magnetic properties of CoFeMnSi (CFMS) Heusler alloy films, which is known as a spin gapless semiconductor. We grew CFMS films consisting of Ta (5)/Ru(5)/CFMS (20)/Ta (5) and Ru (5)/CFMS (10)/Ta (5) (thickness in nm) on Si substrates by high vacuum sputtering. We confirmed semiconductor-like behavior in these films by measuring the conventional Hall effect. The magnetic field dependence of transverse magnetoresistance was measured by introducing a magnetic field horizontal to the film. Angular dependence of transverse magnetoresistance was detected, which can be useful for magnetic sensor applications.

  • 強磁性多層膜ナノ構造における効果的な異常ネルンスト効果の検出

    山田和正,有木大晟, 野村竜也, 木村崇

    磁気記録・情報ストレージ研究会  2018.7 

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    Event date： 2019.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

    熱は電流に比べて制御しにくいため、各種物性値を精度良く調べるのは、容易ではない。本研究では、強磁性多層膜のナノコンタクトなどの構造を利用して、より高精度に異常ネルンスト効果、及び関連現象を測定する手法を開発する。異常ネルンスト効果を効果的に検出したので報告する。

  • ホール効果によるポリアニリンの移動度の評価

    山田和正、滝川陽介、成清敬史、篠崎文重、黒田憲寛、中村浩昭、板東徹

    第７２回応用物理学学術講演会  2011.9 

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    Event date： 2011.8 - 2011.9

    Country：Japan  

    The evaluation of mobility by Hall effect of Polyaniline

  • The temperature dependence of Hall mobility of the oxide thin film In2O3-ZnO

    K. Yamada, B. Shinozak, K. Yano and H. Nakamura

    26th International Conference on Low Temperature Physics  2011.8 

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    Event date： 2011.8

    Country：China  

  • Pressure effect on unidirectional magnetoresistance in heavy metal/ferromagnetic bilayer

    #Riku Iimori, #Teppei Kimura, #Taishiro Yamazaki, Kazmasa Yamada, Akihiro Mitsuda and Takashi Kimura

    The 7th International Symposium on Frontiers in Materials Science FMS2024  2024.1 

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    Event date： 2024.1

    Language：English  

    Venue：NYCU, Hsinchu   Country：Taiwan, Province of China  

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Professional Memberships

  • The Physical Society of Japan

  • Japan Society of Applied Physics

Committee Memberships

  • 西日本誘電体会議   世話人  

    2006.11 - 2006.12   

Academic Activities

  • Co-chairman International contribution

    2019 MMM  （ Las Vegas UnitedStatesofAmerica ） 2019.11

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    Type：Competition, symposium, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2019

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    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：1

  • 座長

    日本物理学会九州支部例会  （ Japan ） 2018.12

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    Type：Competition, symposium, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2018

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    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：1

  • 世話人

    西日本誘電体会議  （ Japan ） 2012.12

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    Type：Competition, symposium, etc. 

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Research Projects

  • 熱スピン注入による磁歪制御とナノスピンアクチュエータの開発

    Grant number：18H03866  2018 - 2021

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship：Coinvestigator(s)  Grant type：Scientific research funding

  • organic spin seebeck

    Grant number：17K06303  2017 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    yamada kazumasa

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    Authorship：Principal investigator  Grant type：Scientific research funding

    In this study, we performed thermal spin injection into organic materials and conducted experiments on the generation and detection of spin-polarized currents in organic materials.　An organic spin Seebeck device with a crossbar structure was fabricated by using amorphous CoFeAl as a ferromagnetic layer, carbon as an organic conduction layer, and Pt as a spin current conversion layer. Pt has a large inverse spin Hall effect and is suitable as a spin current conversion layer. In the CoFeAl/carbon/Pt crossbar, the thermal spin current injection effect from the CoFeAl layer was observed by the Pt spin current conversion. Temperature dependence measurements were also performed. As future work, contribution and separation of the Nernst effect of the CoFeAl layer are necessary.

    CiNii Research

  • 酸化物強誘電体の表面伝導の解明

    2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship：Coinvestigator(s)  Grant type：Scientific research funding

  • 強誘電体分域境界に生じる自発分極と結合した自由電子系の確定と解明

    Grant number：16340093  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship：Coinvestigator(s)  Grant type：Scientific research funding

Educational Activities

  • 2025年度後期から融合基礎工学科の「振動力学」を担当する予定。
    デバイス理工学メジャーの教育を担当する。

Class subject

  • 自然科学総合実験

    2024.10 - 2024.12  

  • 物理学総合実験

    2024.3 - 2024.11  

  • 自然科学総合実験

    2023.10 - 2023.12   Fall quarter

  • 物理学総合実験

    2023.4 - 2024.3   Full year

  • 自然科学総合実験

    2022.10 - 2022.12   Fall quarter

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FD Participation

  • 2021.3   Role：Participation   Title：【物理学FD】ハイブリッド講義の実践例と講義活性化

    Organizer：[Undergraduate school/graduate school/graduate faculty]

  • 2020.11   Role：Participation   Title：事件等発生時の学生対応に関するＦＤ・ＳＤ

    Organizer：[Undergraduate school/graduate school/graduate faculty]

Outline of Social Contribution and International Cooperation activities

  • 世界物理年イベントのデモンストレーションを担当。
    九州大学理学部同窓会幹事。

Social Activities

  • 高校生に体験入学にて超伝導を教える。

    2016.3

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    Audience：Infants,　Schoolchildren,　Junior students,　High school students

    Type：Seminar, workshop

  • 高校生に体験入学にて超伝導を教える。

    2015.3

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    Audience：Infants,　Schoolchildren,　Junior students,　High school students

    Type：Seminar, workshop

  • 高校生に体験入学にて超伝導を教える。

    2014.3

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    Audience：Infants,　Schoolchildren,　Junior students,　High school students

    Type：Seminar, workshop

  • 高校生に体験入学にて超伝導を教える。

    2013.4

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    Audience：Infants,　Schoolchildren,　Junior students,　High school students

    Type：Seminar, workshop

  • 高校生に体験入学にて超伝導を教える。

    2012.3

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    Audience：Infants,　Schoolchildren,　Junior students,　High school students

    Type：Seminar, workshop

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Travel Abroad

  • 2019.2 - 2020.3

    Staying countory name 1：United Kingdom   Staying institution name 1：University of York

  • 2015.8

    Staying countory name 1：India   Staying institution name 1：JAYPEE UNIVERSITY OF INFORMATION TECHNOLOGY

  • 2015.2

    Staying countory name 1：India   Staying institution name 1：JAYPEE UNIVERSITY OF INFORMATION TECHNOLOGY