Updated on 2025/03/25

写真a

 
KATO, Takeshi
 
Organization
Institute of Materials and Systems for Sustainability Advanced Measurement Technology Center (AMTC) Professor
Graduate School
Graduate School of Engineering
Title
Professor
Contact information
メールアドレス

Degree 2

  1. 博士(工学) ( 1998.3   名古屋大学 ) 

  2. 修士(工学) ( 1995.3   名古屋大学 ) 

Current Research Project and SDGs 4

  1. 時間分解スピンダイナミクス計測

  2. 超高密度ビットパターン媒体の開発

  3. Development of Low Energy Cost Spintronics Devices

  4. High sensitivity magnetic field sensor using MR effect

Research History 4

  1. 名古屋大学   未来材料・システム研究所 高度計測技術実践センター   教授

    2020.4

  2. 名古屋大学   工学研究科 電子情報システム専攻   准教授

    2014.4 - 2020.3

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    Country:Japan

  3. 名古屋大学量子工学専攻・准教授

    2007.4

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    Country:Japan

  4. Nagoya University, Department of Electronics, Assistant Professor

    1998.4

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    Country:Japan

Education 2

  1. Nagoya University   Graduate School, Division of Engineering

    1993.4 - 1998.3

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    Country: Japan

  2. Nagoya University   Faculty of Engineering

    1989.4 - 1993.3

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    Country: Japan

Professional Memberships 4

  1. IEEE   Magnetics Society, Administrative Committee, Member, Nagoya Chapter, Chair

    2009.1

  2. 日本磁気学会

    2019.6

  3. 電気学会

    2019.5

  4. The Japan Society of Applied Physics

Committee Memberships 41

  1. MORIS2024 International Advisory Committee   Chair  

    2023.5 - 2024.12   

  2. IEEE Magnetics Society Nagoya Chapter   Chair  

    2023.1   

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    Committee type:Academic society

  3. IEEE Magnetics Society Administrative Committee   Member  

    2023.1 - 2025.12   

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    Committee type:Academic society

  4. 日本磁気学会 理事会   編集理事  

    2021.6 - 2023.6   

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    Committee type:Academic society

  5. 日本磁気学会 編集・論文委員会   編集委員長  

    2021.6 - 2023.6   

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    Committee type:Academic society

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Awards 3

  1. 日本磁気学会 優秀研究賞

    2023.9   日本磁気学会   高機能磁性薄膜とその工学応用に関する研究

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  2. 日本磁気学会 学会活動貢献賞

    2012.10   日本磁気学会  

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    Country:Japan

  3. 日本応用磁気学会 優秀講演賞

    2004.11   日本応用磁気学会  

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    Country:Japan

 

Papers 168

  1. Spin-orbit torques in ferrimagnetic GdFeCo alloys Reviewed

    N. Roschewsky, T. Matsumura, S. Cheema, F. Hellman, T. Kato, S. Iwata, S. Salahuddin

    Appl. Phys. Lett.   Vol. 109   page: 112403-1-4   2016.9

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

    DOI: 10.1063/1.4962812

  2. Control of magnetic properties of MnGa films by Kr+ ion irradiation for application to bit patterned media Reviewed

    D. Oshima, T. Kato, S. Iwata, S. Tsunashima

    IEEE Trans. Magn.   Vol. 49 ( 7 ) page: 3608 - 3611   2013.7

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

    DOI: 10.1109/TMAG.2013.2249501

  3. Perpendicular anisotropy and Gilbert damping in sputtered Co/Pd multilayers Reviewed

    T. Kato, Y. Matsumoto, S. Okamoto, N. Kikuchi, S. Iwata, O. Kitakami, S. Tsunashima

    IEEE Trans. Magn.   Vol. 48 ( 11 ) page: 3288 - 3291   2012.11

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TMAG.2012.2198446

  4. Time resolved magnetization dynamics and damping constant of sputtered Co/Ni multilayers Reviewed

    T. Kato, Y. Matsumoto, S. Okamoto, N. Kikuchi, O. Kitakami, N. Nishizawa, S. Iwata

    IEEE Trans. Magn.   Vol. 47 ( 10 ) page: 3036 - 3039   2011.10

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TMAG.2011.2158082

  5. Planar patterned media fabricated by ion irradiation into CrPt3 ordered alloy films Reviewed

    T. Kato, Y. Yamauchi, S. Iwata, S. Tsunashima, K. Matsumoto, T. Morikawa, K. Ozaki

    J. Appl. Phys.   Vol. 105 ( 7 ) page: 07C117   2009.4

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

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Books 3

  1. スピントロニクスハンドブック−基礎から応用までー Reviewed

    佐橋政司,湯浅新治,遠藤哲郎 監修( Role: Joint author ,  第9章第2節第1項 磁性金属/非磁性金属界面の垂直磁気異方性(pp. 216-221))

    エヌ・ティー・エス  2023.5  ( ISBN:978-4-86043-842-5

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    Language:Japanese Book type:Dictionary, encyclopedia

  2. 基礎から学ぶ磁性材料

    佐藤勝昭,福永博俊,遠藤恭,三谷誠司,加藤剛志,雨宮健太,齊藤準,石橋隆幸,谷垣俊明,菅原昭,品田博之,孝橋照生,竹澤昌晃,藤﨑敬介,直江正幸,今岡淳,水野勉,笠置映寛,赤城文子( Role: Joint author ,  3.1節 pp. 103-113)

    R&D支援センター  2020.3  ( ISBN:978-4-905507-43-7

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    Language:Japanese Book type:Textbook, survey, introduction

  3. 改訂 磁気工学の基礎と応用

    荒井賢一,石井 修,石山和志,伊良皆啓治,岩坂正和,岩田 聡,岩原正吉,上原 弦,円福敬二,岡崎靖雄,柿川真紀子,加藤剛志,北本仁孝,早乙女英夫,榊 陽,佐々木堂,笹田一郎,佐藤 駿,佐藤敏郎,高梨弘毅,竹澤昌晃,竹村泰司,田島克文,徳永雅亮,中園 聡,中村健二,中村慶久,西尾博明,枦 修一郎,福永博俊,藤井壽崇,本田 崇,松木英敏,山崎慶太,山崎健一,山崎二郎,山沢清人,山田外史,山元 洋,脇若弘之( Role: Joint author)

    コロナ社  2013.10  ( ISBN:978-4-339-00856-2

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    Language:Japanese

Presentations 728

  1. Spin Orbit Torque in Gd/FeCo Multilayers with layer Thickness Gradient on Ta layer

    R. Yabushita, D. Oshima, T. Kato

    2025.3.7 

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    Event date: 2025.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  2. Dependence of Spin Orbit Torque in Gd/FeCo Multilayers on Their Layer Thickness Gradient

    R. Yabushita, D. Oshima, T. Kato

    2025.2.10 

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    Event date: 2025.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  3. Noise Characterization of Spin-Transfer-Torque-based Magnetic Field Sensor International coauthorship International conference

    K. Komuro, H. Nicolas, B. Dieny, D. Oshima, T. Kato, R. Sousa

    The 16th Joint Conference on Magnetism and Magnetic Materials and Intermag  2025.1.15 

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    Event date: 2025.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:New Orleans, Louisiana, USA   Country:United States  

  4. Hydrogen gas sensing using Pd coated spin-valve GMR International conference

    D. Oshima, T. Kato, S. Iwata

    The 16th Joint Conference on Magnetism and Magnetic Materials and Intermag  2025.1.14 

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    Event date: 2025.1

    Language:English   Presentation type:Poster presentation  

    Venue:New Orleans, Louisiana, USA   Country:United States  

  5. Spin Transfer Torque assisted Field-Free Spin Orbit Torque Switching in CPP-GMR with Antiferromagnetically Coupled Perpendicularly Magnetized Co/Pd Memory Layer International conference

    D. Pan, D. Oshima, T. Kato

    The 16th Joint Conference on Magnetism and Magnetic Materials and Intermag  2025.1.16 

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    Event date: 2025.1

    Language:English   Presentation type:Poster presentation  

    Venue:New Orleans, Louisiana, USA   Country:United States  

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Works 8

  1. Progress on Efficient Current Induced Magnetization Switching

    T. Kato, S. Iwata, D. Oshima

    2020.5

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  2. Progress on Efficient Current Induced Magnetization Switching

    T. Kato, S. Iwata, D. Oshima

    2020.3

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  3. ビッグデータ解析の基盤を支える磁気ストレージ,メモリの高度化

    2019.1

  4. Fabrication of Hard Magnetic Metallic Thin Films without Fe, Co, or Ni and Their Application

    2017.2

  5. 名古屋大学微細加工プラットフォーム事業によるものづくり支援

    2014.11

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Research Project for Joint Research, Competitive Funding, etc. 10

  1. CoPd系低キュリー温度多層膜を利用した磁気ランダムアクセスメモリの高密度化

    2019.8 - 2020.7

    立松財団 

    加藤剛志

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    Grant type:Competitive

  2. Development of the treatment process using ion irradiation for the fabrication of ultra high-density MRAM cells

    2014.4 - 2016.3

    International Cooperative Research 

  3. イオン照射を用いた超平坦・超高密度ビットパターン媒体の研究開発

    2013.8 - 2014.3

    総務省SCOPE 

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    Grant type:Competitive

  4. 超平坦・超高密度ビットパターン媒体の開発

    2012.8 - 2013.7

    立松財団 

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    Grant type:Competitive

  5. イオン照射法による超平坦・超高密度ビットパターン媒体の開発

    2011.12 - 2013.3

    研究成果最適展開支援プログラムA-STEP 探索タイプ 

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    Grant type:Competitive

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KAKENHI (Grants-in-Aid for Scientific Research) 19

  1. Enhancement of spin orbit torque by introducing the broken inversion symmetry and development of 3-dimensional magenetic memory

    Grant number:20H02182  2020.4 - 2023.3

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

    Kato Takeshi

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\17810000 ( Direct Cost: \13700000 、 Indirect Cost:\4110000 )

    Spin Orbit Torque (SOT) switching is considered as a promising way of the next generation writing scheme of the magnetic random access memories. This study focused on the relationship between SOT switching current density and structural inversion symmetry of the magnetic materials, and Gd/FeCo multilayers with graded layered thickness and Tb/Gd/FeCo multilayers were investigated. The SOT switching current density of Gd/FeCo multilayers decreased with increasing the gradient of the layer thickness of the multilayer. Moreover, in Tb/Gd/FeCo multilayers, the SOT switching current density decreased with increasing Tb layer thickness, even though the effective perpendicular anisotropy increased. These results suggest the increase of the broken inversion symmetry along film normal direction decreases the SOT switching current density.

  2. Feasibility study on multilevel memory based on skyrmion dynamics

    Grant number:17K19068  2017.6 - 2019.3

    Grant-in-Aid for Challenging Research (Exploratory)

    Okamoto Satoshi

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    Authorship:Coinvestigator(s) 

    We studied the feasibility of a novel multilevel memory device based on skyrmion which has recently attracted much attention as one of the topological spin structures. We firstly studied the condition for the stable existence of skyrmion on a magnetic thin film through the micromagnetic calculations. Next, under thus determined stable condition of skyrmion, we explored the microwave response of the skyrmions. Consequently, we successfully demonstrated that generation and erasing of skyrmions inside the magnetic disk was possible by applying a microwave pulse. We had tried to study the microwave response of skyrmions experimentally. For this purpose, we fabricated a device using a GdFeCo amorphous alloy thin film. Unfortunately, it was difficult to observe the skyrmions on the GaFeCo amorphous disk. However, the control of magnetization direction by applying the microwave was clearly confirmed as a fundamental operation of skyrmion memory.

  3. Magnetization switching by spin current induced by ultra short pulse laser

    Grant number:17K18878  2017.6 - 2019.3

    Grant-in-Aid for Challenging Research (Exploratory)

    Kato Takeshi

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    Authorship:Principal investigator 

    Grant amount:\6370000 ( Direct Cost: \4900000 、 Indirect Cost:\1470000 )

    In order to observe spin current generation by the ultra short pulse laser and the magnetization switching by the spin current, two experiments, 1) spin current injection to Au from 3d transition metal Fe and 2) magnetization switching of GdFeCo by injecting the spin current, were carried out. Fe thickness dependence of the damping constant of Fe showed the Au layer has useful properties as a spin current conductor. When the spin current injected to GdFeCo, the moment of GdFeCo feels large equivalent magnetic field around the compensation composition. Moreover, it was found that the injected spin current exerts a torque to only FeCo moment.

  4. Local magnetization control using spin Hall effect and its application to GMR magnetic sensors

    Grant number:17H03249  2017.4 - 2020.3

    Iwata Satoshi

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    Authorship:Coinvestigator(s) 

    In this research project, we have developed strain-sensor using giant magnetoresistance effect, where inverse magneto-striction effect is applied to the magnetic free layer in a spin valve structure. In order to avoid from influence of magnetic stray field, we employ sinusoidal signal detection method, where the magnetization direction of the magnetic free layer was modulated by alternative magnetic field by flowing AC current through Al strip line formed on GMR element. In next stage, we have investigated magnetization control by spin-Hall effect. The sensor device is composed from Ta/FeCo layer for producing spin current, a magnetoresistive spin-valve element and anti-ferromagneic NiO layer which magnetically connects Ta/FeCo and spin-valve layers. In this device, magnetization reversal by spin Hall effect was observed.

  5. Control of spin dynamics by electric field and electric-field-assisted spin Hall switching

    Grant number:16H04328  2016.4 - 2019.3

    Kato Takeshi

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    Authorship:Principal investigator 

    Grant amount:\16770000 ( Direct Cost: \12900000 、 Indirect Cost:\3870000 )

    Spin Hall switching is considered as a promising way of the next generation writing scheme of the magnetic random access memories. This study focused on the effect of the applied electric field on the spin Hall switching of Co and Fe ultrathin films, where the electric field was applied thorough HfO2/MgO insulation layer. Moreover, the effect of the electric field on the spin dynamics was also studied. The coercivity and current density of the spin Hall switching were modified by the electric field as 43 %/(V/m) and 20 %/(V/m), respectively. The modifications of the coercivity and the current density of the spin Hall switching by the electric field were found to be sensitive to the deposition condition of the insulation layer.

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Industrial property rights 7

  1. 磁気メモリ素子及び磁気メモリ装置

    園部義明,加藤剛志

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    Applicant:三星電子株式会社,名古屋大学

    Application no:特願2020-167193  Date applied:2020.10

    Announcement no:特開2022-059442  Date announced:2022.4

  2. 磁気抵抗素子及び磁気抵抗メモリ装置

    園部義明,町田顕,加藤剛志

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    Applicant:三星株式会社,国立大学法人名古屋大学

    Application no:特願2017-226830  Date applied:2017.11

    Announcement no:特開2019-096815  Date announced:2019.6

    Country of applicant:Domestic  

  3. 磁気抵抗メモリ装置

    園部義明,園田正俊,加藤剛志

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    Applicant:三星株式会社,国立大学法人名古屋大学

    Application no:特願2017-20282  Date applied:2017.2

    Announcement no:特開2018-129105  Date announced:2018.8

    Country of applicant:Domestic  

  4. 磁気センサ及び磁界測定装置

    岩田聡,加藤剛志,綱島滋

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    Applicant:国立大学法人名古屋大学

    Application no:特願2009-115900  Date applied:2009.5

    Announcement no:特開2010-266247  Date announced:2010.11

    Country of applicant:Domestic  

  5. 磁気記録媒体,磁気記録再生装置,および磁気記録媒体の製造方法

    松本幸治,森河剛,尾崎一幸,綱島滋,岩田聡,加藤剛志

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    Applicant:富士通株式会社

    Application no:特願2007-268533  Date applied:2007.10

    Announcement no:特開2009-99182  Date announced:2009.5

    Country of applicant:Domestic  

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Teaching Experience (On-campus) 34

  1. 量子理論

    2018

  2. 磁性体工学特論

    2018

  3. 電子回路論及び演習

    2018

  4. 量子理論

    2017

  5. 磁性体工学特論

    2017

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Teaching Experience (Off-campus) 5

  1. 大学院特別講義

    2020.10 - 2021.3 Mie University)

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    Level:Postgraduate 

  2. 電気電子材料

    2014.4 - 2015.3 Chubu University)

  3. 電気電子材料

    2012.4 - 2013.3 Chubu University)

  4. 特別講義

    2008.4 - 2009.3 Mie University)

  5. アナログ回路演習

    2001.4 - 2002.3 Aichi Institute of Technology)

 

Social Contribution 3

  1. テクノフロンティアセミナー TEFS 2006

    2006.4 - 2007.3

  2. テクノフロンティアセミナー TEFS 2002

    2003.4 - 2004.3

  3. テクノフロンティアセミナー TEFS 1999

    1999.4 - 2000.3