OHTAKE Mitsuru

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Associate Professor

Research Fields, Keywords

Magnetism, スピントロニクス, エネルギーハーベスト, 電磁エネルギー変換, Nanomaterials, Crystal Growth, 薄膜

Mail Address

E-mail address

Related SDGs




Education 【 display / non-display

  • 2008.4
    -
    2011.3

    Chuo University   Doctor Course   Completed

  • 2006.4
    -
    2008.3

    Chuo University   Master Course   Completed

  • 2002.4
    -
    2006.3

    Chuo University   Graduated

Degree 【 display / non-display

  • Doctor of Engineering - Chuo University

  • Master of Engineering - Chuo University

Campus Career 【 display / non-display

  • 2018.4
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 2018.4
     
     

    Concurrently   Yokohama National UniversityGraduate School of Engineering   Department of Systems Integration   Associate Professor  

  • 2018.4
     
     

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Mechanical Engineering and Materials Science   Associate Professor  

  • 2018.4
     
     

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Mechanical Engineering, Materials Science and Ocean Engineering   Associate Professor  

  • 2018.4
     
     

    Concurrently   Yokohama National UniversityGraduate school of Engineering Science   Department of Mechanical Engineering, Materials Science and Ocean Engineering   Associate Professor  

External Career 【 display / non-display

  • 2020.4
    -
    2021.3

    Chuo University   Faculty of Science and Enginnering   Part-time Lecturer  

  • 2017.4
    -
    2018.3

    Kogakuin University   Faculty of Engineering   Assistant Professor  

  • 2015.10
    -
    2018.3

    Chuo University   Faculty of Science and Enginnering   Researcher  

  • 2015.9
    -
    2017.3

    Kogakuin University   Faculty of Engineering   Assistant Professor  

  • 2011.4
    -
    2015.8

    Chuo University   Faculty of Science and Engineering   Assistant Professor  

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Academic Society Affiliations 【 display / non-display

  • 2020.5
     
     
     

    映像情報メディア学会

  • 2015.8
     
     
     

    電気学会

  • 2011.1
     
     
     

    日本鉄鋼協会

  • 2008.11
     
     
     

    日本金属学会

  • 2007.2
     
     
     

    応用物理学会

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Research Areas 【 display / non-display

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

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electric and electronic materials

 

Thesis for a degree 【 display / non-display

  • Preparation and Characterization of Epitaxial Magnetic Thin Films

    Mitsuru Ohtake

    2011.3

    Doctoral Thesis   Single Work    [Reviewed]

  • Fabrication and characterization of epitaxial high-Ku magnetic thin films using UHV-MBE

    Mitsuru Ohtake

    2008.3

    Master Thesis   Single Work  

  • 島状成長した単層及び二層薄膜のナノ構造解析と電気・磁気特性評価

    大竹充, 秋田裕太, 半田貴洋

    2006.3

    Thesis(Others)   Joint Work  

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    ガラス基板上にAl,Cu,Ag,Au,Feの単層および二層薄膜を形成し,表面起伏と電気,磁気特性との関係を調べた.ガラス基板上における金属薄膜の成長様式は島状成長となり,形成初期過程では不連続膜となった.その結果,電気抵抗率はバルク値に比べて非常に高くなった.膜厚の増加に伴い,膜が連続になり,電気抵抗率もバルク値に収束する傾向が認められた.収束するまでに必要な膜厚は金属材料の種類によって変化し,表面拡散が少ないことが期待される高融点材料を用いることにより,薄い膜でもバルク値に収束させることができることが分かった.低融点と高融点の金属材料を積層させ,低融点材料の濡れ性向上させ,電気抵抗率を低減させる試みも行った.また,不連続膜構造は,磁性材料の磁化値を減少させることも示した.(担当部分) 薄膜試料作製全般,形態観察一部,電気特性測定一部,磁気特性測定全般

Papers 【 display / non-display

  • Magnetostrictive properties of Co-Fe alloy epitaxial thin films with Co-rich composition

    Shota Noro, Mitsuru Ohtake, Tetsuroh Kawai, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba

    AIP Advances   12 ( 3 )   035144-1 - 035144-4   2022.3  [Reviewed]

    DOI

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

  • Structure and Magnetic Properties of Mn-Al Epitaxial Films

    Shota Noro, Mitsuru Ohtake, Shinji Isogami, Masaaki Futamoto, Tetsuroh Kawai, Fumiyoshi Kirino, Nob … Show more authors

    IEICE Technical Report   121 ( 402 )   1 - 5   2022.2

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    Language:Japanese   Publishing type:Research paper (research society, symposium materials, etc.)   Publisher:The Institute of Electronics, Information and Communication Engineers (IEICE)   Joint Work  

  • Impact of B-doping on topological Hall resistivity in (111)- and (110)-oriented Mn4N single layers with the non-collinear spin structure

    Shinji Isogami, Mitsuru Ohtake, Yukiko K. Takahashi

    Journal of Applied Physics   131 ( 7 )   073904-1 - 073904-6   2022.2  [Reviewed]

    DOI Web of Science

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

  • Effects of Composition on the Ordered Phase Formation in Mn-Al and Mn-Ge Alloy Thin Films Grown on Cr(001) Single-Crystal Underlayers

    Shota Noro, Kotaro Nakano, Mitsuru Ohtake, Shinji Isogami, Masaaki Futamoto, Tetsuroh Kawai, Fumiyo … Show more authors

    IEEE Transactions on Magnetics   2022.2  [Reviewed]

    DOI

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

  • Influence of B Content on the Magnetostrictive Properties of Single-Crystalline, Poly-Crystalline, and Amorphous Fe-Co-B Alloy Films

    Yuta Nakamura, Mitsuru Ohtake, Tetsuroh Kawai, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba

    Journal of the Magnetics Society of Japan   45 ( 6 )   136 - 141   2021.11  [Reviewed]

    DOI CiNii Research

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 日本磁気学会   Joint Work  

    <p>  (Fe<sub>0.7</sub>Co<sub>0.3</sub>)<sub>100–<i>x</i></sub>B<sub><i>x</i></sub> (<i>x</i> = 0–15, at. %) alloy films of 100 nm thickness are prepared on VN(001) single-crystalline underlayers at 600 °C and on VN poly-crystalline underlayers at room temperature (RT). A high substrate temperature of 600 °C is used to promote epitaxial film growth on VN(001) underlayer. Influences of B content on the structural, magnetic, and magnetostrictive properties are investigated. The films formed on VN(001) underlayers involve bcc(001) epitaxial crystalline phase, whereas those formed on VN poly-crystalline underlayers consist of poly-crystalline and/or amorphous phases. Surface roughness of film formed on VN(001) underlayer at 600 °C increases with increasing the B content, whereas flat surfaces are realized for the films formed on VN poly-crystalline underlayers at RT. The surface morphology is influenced by both the substrate temperature and the B content. The films with flat surfaces show good soft magnetic properties. In contrast, rough surface causes an increase in the saturation magnetic field. In the case of films formed on VN(001) single-crystalline underlayer at 600 °C, magnetostriction value of <i>λ</i><sub>100</sub> increases from +200 × 10<sup>–6</sup> to +310 × 10<sup>–6</sup>, as the B content increases from <i>x</i> = 0 to 5. With further increasing the B content, <i>λ</i><sub>100</sub> value decreases due to unsaturation of magnetization at a magnetic field of 1200 Oe which is the maximum value used for measurement. <i>λ</i><sub>111</sub> values are nearly zero (–10 × 10<sup>–6</sup> – +20 × 10<sup>–6</sup>) for all the investigated B contents. Slight addition of B atoms around 5 at. % is effective in enhancing the <i>λ</i><sub>100</sub> value, while keeping high crystallographic quality, flat surface, and soft magnetic property. On the contrary, the films formed on VN poly-crystalline underlayers at RT show moderately large <i>λ</i> values of about +60 × 10<sup>–6</sup> for all the B contents. The present study shows that control of B content and realization of flat surface are important factors in enhancing the magnetostriction of Fe-Co-B film.</p>

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Review Papers 【 display / non-display

  • Development of Media Nanostructure for Perpendicular Magnetic Recording

    Masaaki Futamoto,Mitsuru Ohtake

    Journal of the Magnetics Society of Japan   41 ( 6 )   108 - 126   2017.11  [Reviewed]  [Invited]

    DOI

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Magnetics Society of Japan   Joint Work  

  • Metastable Ordered Phase Formation in CoPt and Co3Pt Alloy Thin Films Epitaxially Grown on Single-Crystal Substrates

    Mitsuru Ohtake,Daisuke Suzuki,Fumiyoshi Kirino,Masaaki Futamoto

    IEICE Transactions on Electronics   E96-C ( 12 )   1460 - 1468   2013.12  [Reviewed]  [Invited]

    DOI

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Institute of Electronics, Information and Communication Engineers   Joint Work  

  • Structure and Magnetic Properties of Co/Pd Multilayer Films Epitaxially Grown on Single-Crystal Substrates

    Mitsuru Ohtake,Kousuke Tobari,Masaaki Futamoto

    IEICE Transactions on Electronics   E96-C ( 12 )   1452 - 1459   2013.12  [Reviewed]  [Invited]

    DOI

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Institute of Electronics, Information and Communication Engineers   Joint Work  

Awards 【 display / non-display

  • 令和2年度 日本磁気学会 論文賞

    2020.9   日本磁気学会   Influence of Cap-Layer on the Structure of FePt Alloy Thin Film Formed on VN and VC Underlayers

    Individual or group name of awards:Tomoki Shimizu, Mitsuru Ohtake, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba

  • 平成28年度 日本磁気学会 論文賞

    2016.9   日本磁気学会   Effect of Si/Fe Composition, Substrate Temperature, and Substrate Orientation on the Structure and Magnetic Properties of Fe-Si Alloy Film

    Individual or group name of awards:Takuya Aida, Tetsuroh Kawai, Mitsuru Ohtake, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba

  • Best Poster Award at the International Conference of Asian Union of Magnetics Societies 2010 (ICAUMS 2010)

    2010.12   The Asian Union of Magnetics Societies (AUMS)   Preparation of Metastable bcc Permalloy Epitaxial Thin Films on GaAs Single-Crystal Substrates

    Individual or group name of awards:Mitsuru Ohtake

  • 平成22年度 日本磁気学会 学術奨励賞

    2010.9   日本磁気学会   エピタキシャルhcp-Ni薄膜の構造と磁気特性

    Individual or group name of awards:大竹充

  • 電子情報通信学会 磁気記録・情報ストレージ研究会 専門委員長賞

    2008.10   電子情報通信学会 磁気記録・情報ストレージ研究会   SmCo5(0001)薄膜のエピタキシャル成長と構造解析

    Individual or group name of awards:大竹充

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Grant-in-Aid for Scientific Research 【 display / non-display

  • 希土類金属と遷移金属から構成される規則合金のエピタキシャル薄膜形成に関する研究 (17K14660)

    2017.4 - 2020.3

    科学研究費補助金  Grant-in-Aid for Young Scientists(B)

    Investigator(s):大竹充

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    Grant type:Competitive

  • エピタキシャル薄膜による異方性ナノコンポジット磁石の形成に関する研究 (26820117)

    2014.4 - 2016.3

    科学研究費補助金  Grant-in-Aid for Young Scientists(B)

    Investigator(s):大竹充

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    Grant type:Competitive

  • 大容量MRAM対応のL10型規則合金とMgOの極薄積層膜形成技術に関する研究 (23860047)

    2011.4 - 2013.3

    科学研究費補助金  Grant-in-Aid for Research Activity start-up

    Investigator(s):大竹充

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    Grant type:Competitive

  • 磁性薄膜のエピタキシャル成長と薄膜評価に関する研究 (21・6780)

    2009.4 - 2011.3

    科学研究費補助金  Grant-in-Aid for JSPS Fellows

    Investigator(s):大竹充

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    Grant type:Competitive

Other external funds procured 【 display / non-display

  • 磁歪式振動発電デバイスに適した磁性材料の開発と厚膜形成技術の基礎構築

    2021.1 - 2023.3

    Investigator(s):大竹充

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    Authorship:Principal investigator 

  • 超高密度ビットパターンド媒体対応の磁性合金エピタキシャル積層薄膜形成技術の開発

    2011.8 - 2012.3

    Japan Science and Technology Agency  平成23年度 第1回 研究成果最適展開支援プログラム・FSステージ 探索タイプ

    Investigator(s):大竹充

  • エピタキシャル垂直磁気記録媒体の形成と構造制御技術の開発

    2011.4 - 2012.3

    平成23年度 工学研究奨励援助金

    Investigator(s):大竹充

  • エピタキシャル磁性薄膜形成技術と微細構造・物性評価に関する研究

    2010.1 - 2010.12

    研究助成

    Investigator(s):大竹充

Presentations 【 display / non-display

  • Structure and Magnetic Properties of Mn-Al Epitaxial Films (MRIS2021-16)

    Shota Noro, Mitsuru Ohtake, Shinji Isogami, Masaaki Futamoto, Tetsuroh Kawai, Fumiyoshi Kirino, Nobuyuki Inaba

    IEICE Technical Committee on Magnetic Recording & Information Storage (MRIS)  2022.3  The Institute of Electronics, Information and Communication Engineers

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan  

  • Enhancement of magnetostriction in Fe-Co alloy single-crystal film by group-13 element addition (COD-06)

    Yuta Nakamura, Mitsuru Ohtake, Tetsuroh Kawai, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba

    The 66th Annual Magnetism and Magnetic Materials Conference / The IEEE International Magnetics Conference 2022 (The 15th Joint MMM-Intermag Conference)  The American Institute of Physics / The Institute of Electrical and Electronics Engineers

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    Event date: 2022.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:New Orleans, Louisiana, USA / Online  

  • γ' phase formation in Fe-N thin films prepared on MgO(001) substrates by reactive sputtering (EOE-10)

    Kosuke Imamura, Yura Maeda, Mitsuru Ohtake, Masaaki Futamoto, Tetsuroh Kawai, Fumiyoshi Kirino, Nobuyuki Inaba

    The 66th Annual Magnetism and Magnetic Materials Conference / The IEEE International Magnetics Conference 2022 (The 15th Joint MMM-Intermag Conference)  The American Institute of Physics / The Institute of Electrical and Electronics Engineers

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    Event date: 2022.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:New Orleans, Louisiana, USA / Online  

  • Magnetostrictive properties of Co-Fe alloy epitaxial thin films with Co-rich composition (EOE-04)

    Shota Noro, Mitsuru Ohtake, Tetsuroh Kawai, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba

    The 66th Annual Magnetism and Magnetic Materials Conference / The IEEE International Magnetics Conference 2022 (The 15th Joint MMM-Intermag Conference)  The American Institute of Physics / The Institute of Electrical and Electronics Engineers

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    Event date: 2022.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:New Orleans, Louisiana, USA / Online  

  • Large Magnetostriction in γ'-Fe4N Single-Crystal Thin Film (COD-09)

    Yura Maeda, Kosuke Imamura, Mitsuru Ohtake, Tetsuroh Kawai, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba

    The 66th Annual Magnetism and Magnetic Materials Conference / The IEEE International Magnetics Conference 2022 (The 15th Joint MMM-Intermag Conference)  The American Institute of Physics / The Institute of Electrical and Electronics Engineers

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    Event date: 2022.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:New Orleans, Louisiana, USA / Online  

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Past of Collaboration and Commissioned Research 【 display / non-display

  • 逆ペロブスカイト型軽元素スピントロニクス材料による量子ストレージ技術への展開

    Offer organization: 国立研究開発法人物質・材料研究機構(NIMS連携拠点推進制度)   Cooperative Research within Japan  

    Project Year: 2021.11  -  2023.3 

 

Charge of on-campus class subject 【 display / non-display

  • 2022   Graduation Research

    College of Engineering Science

  • 2022   Graduation Research

    College of Engineering Science

  • 2022   Exercises in Mathematics

    College of Engineering Science

  • 2022   Materials Fabrication Studio

    Graduate school of Engineering Science

  • 2022   Materials Design Seminor

    College of Engineering Science

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Charge of off-campus class subject 【 display / non-display

  • 電気・電子材料

    Institution:中央大学

  • 電気電子材料

    Institution:工学院大学

  • エネルギー・環境倫理

    Institution:工学院大学

  • 電力用デバイス

    Institution:工学院大学

  • 電気磁気学Ⅱ

    Institution:工学院大学

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Committee Memberships 【 display / non-display

  • 日本磁気学会 編集委員会

    2020.9  分野主査(Editor In Chief)

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    Committee type:Academic society 

  • 日本磁気学会 編集委員会

    2013.6  論文委員

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    Committee type:Academic society 

  • 日本磁気学会 編集委員会

    2015.6 - 2019.5  編集委員

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    Committee type:Academic society 

  • 映像情報メディア学会

    2020.5  論文委員

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    Committee type:Academic society 

  • 映像情報メディア学会 マルチメディアストレージ研究会

    2018.10  委員

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    Committee type:Academic society 

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Social Contribution(Extension lecture) 【 display / non-display

  • 磁気記録・情報ストレージ研究会/マルチメディアストレージ研究会 世話人

    Role(s): Logistic support

    電子情報通信学会/映像情報メディア学会  横浜国立大学 みなとみらいキャンパス  2021.10

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    Audience: Researchers

    Type:Planning and holding meetings,conferences,e.t.c.

  • 第43回学術講演会 座長(セッション:磁気物理 磁区構造・原子配列)

    Role(s): Host

    日本磁気学会  2019.9

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    Audience: Researchers

    Type:Lecture

  • マグネティックス研究会 世話人

    Role(s): Logistic support

    電気学会  横浜国立大学 みなとみらいキャンパス  2018.11

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    Audience: Researchers

    Type:Planning and holding meetings,conferences,e.t.c.

  • 第32回ブラシュアップ研修会 講演「エネルギー環境問題と電磁気材料研究」

    Role(s): Lecturer

    名教就美会  2018.9

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    Audience: University students, Teachers, Other

    Type:Seminar, workshop

  • 第42回学術講演会 座長(セッション:Symposium “Multiscale analysis of magnetic materials and its application for electrical vehicle drive system”)

    Role(s): Host

    日本磁気学会  2018.9

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    Audience: Researchers

    Type:Lecture

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