Kaiju, Hideo

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Physics and Physico-Informatics 総合デザイン工学専攻 (Yagami)

Position

Associate Professor

Telephone No.

+81-45-566-1428

Career 【 Display / hide

  • 2002.04
    -
    2004.09

    日本学術振興会, 特別研究員(DC1)

  • 2004.09
    -
    2007.03

    北海道大学, 電子科学研究所, 助手

  • 2007.04
    -
    2013.09

    北海道大学, 電子科学研究所, 助教

  • 2009.10
    -
    2013.03

    科学技術振興機構, さきがけ研究者

  • 2013.10
    -
    2019.03

    北海道大学, 電子科学研究所, 准教授

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Academic Background 【 Display / hide

  • 1996.04
    -
    2000.03

    Keio University, 理工学部, 物理情報工学科

    University, Graduated

  • 2000.04
    -
    2001.09

    Keio University, 理工学研究科, 基礎理工学専攻

    Graduate School, Completed, Master's course

  • 2001.09
    -
    2004.09

    Keio University, 理工学研究科, 基礎理工学専攻

    Graduate School, Withdrawal after completion of doctoral course requirements, Doctoral course

Academic Degrees 【 Display / hide

  • 博士(工学), Keio University, Coursework, 2005.09

 

Research Areas 【 Display / hide

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment

  • Nanotechnology/Materials / Nanostructural physics

  • Nanotechnology/Materials / Applied physical properties

  • Nanotechnology/Materials / Thin film/surface and interfacial physical properties

Research Keywords 【 Display / hide

  • 磁性

  • 薄膜

  • スピントロニクス

  • ナノテクノロジー

  • インピーダンス

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Books 【 Display / hide

  • トンネル磁気キャパシタンス効果の原理と新たな展開

    海住英生, 長浜太郎, 電気学会A部門誌特集号 Vol. 141, pp. 270-278, 2021.05

  • 磁気トンネル接合における電圧誘起磁気キャパシタンス効果

    海住英生, まてりあ Vol. 59, pp. 191-198, 2020.04

  • 固体電気化学を利用したイオン制御による物質合成

    藤岡正弥、海住英生、西井準治, 化学工業社, 2019

  • 磁気トンネル接合における室温巨大磁気キャパシタンス効果

    海住英生、長浜太郎、北上修、西井準治、Gang Xiao, 日本磁気学会研究会資料, 2019

    Scope: Vol. 224, pp. 7-13

  • 磁性薄膜エッジを利用した新規なナノスケール接合デバイスの創製

    海住英生, 藤岡正弥, 西井準治, 電気学会誌, 2019

    Scope: Vol. 139, pp. 730-735

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Papers 【 Display / hide

  • Large magnetocapacitance beyond 420% in epitaxial magnetic tunnel junctions with an MgAl2O4 barrier

    Kenta Sato, Hiroaki Sukegawa, Kentaro Ogata, Gang Xiao, Hideo Kaiju

    Scientific Reports (Springer Science and Business Media LLC)  12 ( 1 ) 7190-1 - 7190-10 2022.05

    Corresponding author, Accepted

     View Summary

    Abstract

    Magnetocapacitance (MC) effect has been observed in systems where both symmetries of time-reversal and space-inversion are broken, for examples, in multiferroic materials and spintronic devices. The effect has received increasing attention due to its interesting physics and the prospect of applications. Recently, a large tunnel magnetocapacitance (TMC) of 332% at room temperature was reported using MgO-based (001)-textured magnetic tunnel junctions (MTJs). Here, we report further enhancement in TMC beyond 420% at room temperature using epitaxial MTJs with an MgAl<sub>2</sub>O<sub>4</sub>(001) barrier with a cation-disordered spinel structure. This large TMC is partially caused by the high effective tunneling spin polarization, resulted from the excellent lattice matching between the Fe electrodes and the MgAl<sub>2</sub>O<sub>4</sub> barrier. The epitaxial nature of this MTJ system sports an enhanced spin-dependent coherent tunneling effect. Among other factors leading to the large TMC are the appearance of the spin capacitance, the large barrier height, and the suppression of spin flipping through the MgAl<sub>2</sub>O<sub>4</sub> barrier. We explain the observed TMC by the Debye-Fröhlich modelled calculation incorporating Zhang-sigmoid formula, parabolic barrier approximation, and spin-dependent drift diffusion model. Furthermore, we predict a 1000% TMC in MTJs with a spin polarization of 0.8. These experimental and theoretical findings provide a deeper understanding on the intrinsic mechanism of the TMC effect. New applications based on large TMC may become possible in spintronics, such as multi-value memories, spin logic devices, magnetic sensors, and neuromorphic computing.

  • Observation and theoretical calculations of voltage-induced large magnetocapacitance beyond 330% in MgO-based magnetic tunnel junctions

    K. Ogata, Y. Nakayama, G. Xiao, H. Kaiju

    Sci. Rep. 11   13807-1 - 13807-10 2021.07

    Research paper (scientific journal), Joint Work, Accepted

  • Development of magnetic responsive random lasers fabricated by a laser-induced surface roughness

    H. Fujiwara, S. Kawaguchi, D. Yonekawa, H. Kaiju

    Appl. Phys. Lett. 119   041105(1) - 041105(5) 2021.07

    Research paper (scientific journal), Joint Work, Accepted

  • Principle and Recent Advances in Tunnel Magnetocapacitance Effect

    H. Kaiju, T. Nagahama

    IEEJ Transactions on Fundamentals and Materials 141   270 - 278 2021.05

    Research paper (scientific journal), Joint Work, Accepted

  • Sign Inversion Phenomenon of Voltage-induced Tunnel Magnetocapacitance

    T. Nakagawa, K. Ogata, Y. Nakayama, G. Xiao, H. Kaiju

    Appl. Phys. Lett. 118   182403-1 - 182403-5 2021.05

    Research paper (scientific journal), Joint Work, Accepted

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Papers, etc., Registered in KOARA 【 Display / hide

Presentations 【 Display / hide

  • NiFe基板上へのレーザー誘起グラファイト合成条件の改善

    藤原英樹, 大黒谷清吾, 林恭平, 海住英生, 平井健二, 雲林院宏

    第69回応用物理学会春季学術講演会, 

    2022.03

    Oral presentation (general)

  • 330%を超える巨大トンネル磁気キャパシタンス効果の観測とメカニズム解明

    緒方健太郎, 中山雄介, Gang Xiao, 海住英生

    電気学会A部門マグネティックス研究会, 

    2021.12

    Oral presentation (general)

  • レーザー加熱によるグラファイト合成法の開発

    藤原英樹, 林恭平, 海住英生, 平井健二, 雲林院宏

    電気学会「レーザー技術を駆使した材料生成とその制御」研究会, 

    2021.11

    Oral presentation (general)

  • Observation and theoretical calculation of spin transport in Ni78Fe22/molecules/Ni78Fe22 nanojunction devices

    K. Hayashi, Y. Sasaki, K. Senshu, T. Misawa, J. Nishii, H. Kaiju

    34th International Microprocesses and Nanotechnology Conference, 

    2021.10

    Oral presentation (general)

  • 電圧誘起トンネル磁気キャパシタンスの符号反転現象

    中川健, 緒方健太郎, 中山雄介, Gang Xiao, 海住英生

    日本物理学会2021年秋季大会, 

    2021.09

    Oral presentation (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • Observation of large tunnel magnetocapacitance effect and elucidation of its mechanism

    2021.04
    -
    2024.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

  • 強磁性ナノ構造を用いた光照射巨大磁気誘電デバイスの創製

    2019.06
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory) , Research grant, Principal investigator

  • Observation of voltage-induced large magnetocapacitance effect in magnetic tunnel junctions

    2018.04
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Research grant, Principal investigator

  • 希土類元素含有ガラス中のプロトンキャリアの超安定化;中温域燃料電池の新展開

    2017.07
    -
    2020.03

    文部科学省, 科学研究補助金基盤研究(B), Research grant, Coinvestigator(s)

  • コロナ放電を用いた革新的イオン導入法の開拓と新物質合成

    2017.07
    -
    2019.03

    日本学術振興会,  科学研究補助金挑戦的研究(萌芽), Research grant, Coinvestigator(s)

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Courses Taught 【 Display / hide

  • PRESENTATION TECHNIQUE

    2022

  • PHYSICS OF MAGNETISM

    2022

  • NANO SCALE SCIENCE JOINT SEMINAR

    2022

  • MATERIAL DESIGN SCIENCE JOINT SEMINAR

    2022

  • INTRODUCTION TO FUNCTIONAL MATERIALS

    2022

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Memberships in Academic Societies 【 Display / hide

  • 電気学会, 

    2016.08
    -
    Present
  • 日本セラミックス協会, 

    2014.12
    -
    Present
  • 応用物理学会, 

    2004.12
    -
    Present
  • 日本磁気学会, 

    2001.04
    -
    Present
  • 日本物理学会, 

    2000.01
    -
    Present

Committee Experiences 【 Display / hide

  • 2020.04
    -
    Present

    磁性材料の高周波特性活用技術調査専門委員会委員, 電気学会

  • 2019.06
    -
    Present

    第1期マテリアルズ・インフォマティクス基礎研究会 委員, 日本材料科学会

  • 2019.06
    -
    Present

    産学連携「分子系の複合電子機能第181委員会」 委員, 日本学術振興会

  • 2018.12
    -
    2019.12

    実行委員, The 3rd Workshop on Functional Materials Science

  • 2018.01
    -
    2018.12

    実行委員, 31st International Microprocessesand Nanotechnology Conference (MNC 2018)

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