Nozaki, Yukio

写真a

Affiliation

Faculty of Science and Technology, Department of Physics (Yagami)

Position

Professor

Related Websites

Career 【 Display / hide

  • 1998.04
    -
    2006.07

    Assistant Professor, ISEE, Kyushu University, システム情報科学研究院, 助手

  • 2006.08
    -
    2010.03

    Assoc. Professor, ISEE, Kyushu University, システム情報科学研究院, 准教授

  • 2010.04
    -
    2016.03

    Assoc. Professor, Dept. of Physics, Keio University, 理工学部物理学科, 准教授

  • 2016.04
    -
    2017.03

    東京大学, 物性研究所, 客員教授

  • 2016.04
    -
    Present

    Assoc. Professor, Dept. of Physics, Keio University, 理工学部物理学科, 教授

Academic Background 【 Display / hide

  • 1993.03

    Keio University, Faculty of Science and Engineering, Department of Physics

    University, Graduated

  • 1995.03

    Keio University, Graduate School, Division of Science and Engineering, Department of Physics

    Graduate School, Completed, Master's course

  • 1998.03

    Keio University, Graduate School, Division of Science and Engineering, Department of Physics

    Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • Ph, D, Keio University, Coursework, 1998.03

 

Research Areas 【 Display / hide

  • Natural Science / Magnetism, superconductivity and strongly correlated systems (Physical Properties II)

Research Keywords 【 Display / hide

  • Spin dynamics

  • Spintronics

  • Spin Mechatronics

  • Magnetism

  • Magnetic device

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Research Themes 【 Display / hide

  • 非線形スピンダイナミクスの温度依存性に関する研究, 

    2016.04
    -
    Present

  • 巨視的回転と微視的スピン角運動量の双方向変換, 

    2015.04
    -
    Present

  • チューナブル回転磁場の生成と非線形スピンダイナミクス励起に関する研究, 

    2015.04
    -
    Present

  • 非平衡状態の非線形ダイナミクスに関する研究, 

    2014.04
    -
    Present

  • スピンダイナミクス由来のスピン流によるスピン移行トルクの測定, 

    2014.04
    -
    Present

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Papers 【 Display / hide

  • Highly accurate evaluation of spin-torque efficiency by measuring in-plane angular dependence of spin-torque ferromagnetic resonance

    Horaguchi T., Matsuo M., Nozaki Y.

    Journal of Magnetism and Magnetic Materials (Journal of Magnetism and Magnetic Materials)  505 2020.07

    ISSN  03048853

     View Summary

    © 2020 Spin-torque ferromagnetic resonance (ST-FMR) is a powerful tool to evaluate spin-torque efficiency (ξFMR), the efficiency of current-induced torque in metallic bilayers consisting of ferromagnetic and nonmagnetic materials. In general, ξFMR can be evaluated from the amplitude ratio between symmetric and anti-symmetric components of the ST-FMR spectrum. However, the ratio is also affected by an unnecessary magnetic field owing to the asymmetric alternating current flow used to excite the ST-FMR. In this article, we demonstrate that ξFMR can be precisely evaluated from the full-angular dependence of the ST-FMR spectrum even though the distribution of alternating current flow is highly asymmetric.

  • Observation of Gyromagnetic Spin Wave Resonance in NiFe Films

    Kurimune Y., Matsuo M., Nozaki Y.

    Physical Review Letters (Physical Review Letters)  124 ( 21 )  2020.05

    ISSN  00319007

     View Summary

    © 2020 American Physical Society. This Letter demonstrates spin wave resonance (SWR) owing to the gyromagnetic effect by propagating a Rayleigh-type surface acoustic wave (R-SAW) through ferromagnetic thin films. The SWR amplitude in a NiFe film shows a higher-order frequency variation than in a magnetoelastic Ni film. This frequency dependence is well understood in terms of the presence of a gyromagnetic field attributable to the local lattice rotation in the R-SAW. From the frequency dependence of the SWR amplitude, the gyromagnetic SWR could be separated from another SWR caused by a magnetoelastic effect of the ferromagnet.

  • Highly nonreciprocal spin waves excited by magnetoelastic coupling in a ni / si bilayer

    Tateno S., Nozaki Y., Nozaki Y.

    Physical Review Applied (Physical Review Applied)  13 ( 1 )  2020.03

     View Summary

    © 2020 American Physical Society. We demonstrate a largely enhanced nonreciprocal propagation of spin waves (SWs) magnetoelastically excited in Ni/Si bilayer films. The nonreciprocity is attributed to the shear component of the strain tensor, which can be enlarged by increasing the thickness of the Si layer. By evaporating a 400-nm-thick Si layer on a Ni film, we enhanced the nonreciprocal ratio by up to 1200%. This finding paves the way for rectification of SWs in magnonic devices.

  • Spin waves parametrically excited via three-magnon scattering in narrow NiFe strips

    Okano G., Nozaki Y.

    Physical Review B (Physical Review B)  100 ( 10 )  2019.09

    ISSN  24699950

     View Summary

    © 2019 American Physical Society. Three-magnon scattering can be used to evaluate the lowest frequency of the magnon band in a ferromagnet. Both the ferromagnetic-resonant (FMR) frequency fFMR and the lowest frequency of the magnon band fmin in narrow-shaped NiFe strips were electrically measured using the anisotropic-magnetoresistance effect. The comparison with a micromagnetic simulation shows that fmin of the magnon band can be controlled independent of fFMR by varying the width w and thickness t of the NiFe strip while maintaining a constant t/w ratio. In addition, we found that the frequency difference, fFMR-fmin, can be greatly increased in thicker NiFe strips. Our results show that narrow-shaped ferromagnets allow us to tune the magnon-band structures by varying their w and t. This ability is important for designing magnon circuits in integrated magnonic devices and for improving the quantitative study on the Bose-Einstein condensation of magnons.

  • Nonreciprocal Spin Current Generation in Surface-Oxidized Copper Films

    Okano G., Matsuo M., Ohnuma Y., Maekawa S., Nozaki Y.

    Physical Review Letters (Physical Review Letters)  122 ( 21 )  2019.05

    ISSN  00319007

     View Summary

    © 2019 American Physical Society. We experimentally demonstrate the nonreciprocal generation of spin current (Js) in a surface-oxidized copper film. The efficiency of conversion is at least 320 times larger than the inverse conversion. This nonreciprocity is due to a novel type of Js generation, which relies on the transfer of angular momentum from the velocity field of free electrons. A gradient in the electrical mobility in the film produces vorticity in the in-plane drift velocity of the free electrons. The inverse process can hardly occur when Js is collinear with the gradient in the electrical mobility.

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

Presentations 【 Display / hide

  • Giant nonreciprocity in spinwave propagation magnetoelastically excited in Ni/Si bilayer films

    S. Tateno and Y. Nozaki

    Intermag 2020, 

    2020.05

    Poster presentation

  • Electrical control of parametric magnon exitation via spin current generated using naturally-oxidized copper film

    G. Okano and Y. Nozaki

    Intermag 2020, 

    2020.05

    Poster presentation

  • NiFe/Dy 二層膜における実効的ギルバート定数の温度依存性

    山野井一人, 榊原有理, 能崎幸雄

    日本物理学会第75回年次大会, 

    2020.03

    Oral presentation (general)

  • スピン渦度結合によりPtで励起される交流スピン流の温度依存性

    松尾 拓海, 山野井 一人, 能崎 幸雄

    応用物理学会春季学術講演会, 

    2020.03

    Poster presentation

  • 表面弾性波を用いたスピン流生成の温度依存性

    鳥羽 竜生, 山野井 一人, 能崎 幸雄

    応用物理学会春季学術講演会, 

    2020.03

    Poster presentation

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

  • Study on multi-scale angular momentum conversion and generation of mechanical rotation from electron spin

    2021.04
    -
    2024.03

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

  • ナノ構造制御と計算科学を融合した傾斜材料開発とスピンデバイス応用

    2019.10
    -
    2025.03

    JST, CREST, Research grant, Principal investigator

  • 音波を用いたスピン流の高効率生成と伝導制御に関する研究

    2018.04
    -
    2021.03

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

  • 巨視的回転運動と微視的スピン角運動量の双方向変換に関する研究

    2017.04
    -
    2019.03

    日本学術振興会, Grant-in-Aid for Scientific Research, Research grant, Principal investigator

  • 力学的回転運動を利用した純スピン流の生成による高周波デバイスへの応用検討、および強磁性共鳴などのスピンダイナミクスの温度依存に関する考察

    2016.04
    -
    2017.03

    企業受託研究費, Commissioned research, Principal investigator

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Intellectual Property Rights, etc. 【 Display / hide

  • スピントロニクスデバイス、磁気メモリ及び電子機器

    Date applied: PCT/JP2019/034831  2019.09 

    Patent, Single

  • スピントロニクスデバイス、磁気メモリ及び電子機器

    Date applied: 2018-165900  2018.09 

    Patent, Single

  • 静磁気結合を利用した磁性ランダムアクセスメモリセル

    Date issued: 特許 2003-408344  2011.06

    Patent, Joint

  • 磁性多層膜ドットを用いた高周波デバイス

    Date issued: 特許第4189502 

    Patent, Joint

  • 磁気メモリ装置及びその書き込み方法

    Date announced: 特許公開2007-242092   

    Patent

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Awards 【 Display / hide

  • SRC論文賞2009

    NOZAKI Yukio, 2010.06, Microwave-assisted magnetization reversal in a Co/Pd multilayer with perpendicular magnetic anisotropy Applied Physics Letters, Vol. 95, No. 8, Art. No. 082505 (August, 2009).

    Type of Award: Award from publisher, newspaper, foundation, etc.

  • 日本磁気学会論文賞

    能崎幸雄, 立石健太郎, 白石壮馬, 松山公秀, 2009.09, サブミクロン幅NiFe薄膜パターンのマイクロ波アシスト磁化反転 Journal of Magnetic Society of Japan, Vol. 33, No. 3, pp.208 – 211 (2009)

    Type of Award: Award from Japanese society, conference, symposium, etc.

  • Storage Research Consortium(SRC) 2009年度論文賞

    2009.06

  • 日本磁気学会論文賞

    2008.09

  • 第1回全学教育優秀授業賞(九州大学)

    NOZAKI Yukio, 2007.09

    Type of Award: Other

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Courses Taught 【 Display / hide

  • SOLID STATE PHYSICS 3

    2023

  • PHYSICS LABORATORIES 2

    2023

  • PHYSICS LABORATORIES 1

    2023

  • LITERATURE OF PHYSICS

    2023

  • LABORATORY IN SCIENCE

    2023

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Courses Previously Taught 【 Display / hide

  • 総合教育セミナー

    慶應義塾大学

    2018.04
    -
    2019.03

  • 自然化学実験

    慶應義塾大学

    2018.04
    -
    2019.03

  • 物性物理学第3

    慶應義塾大学

    2018.04
    -
    2019.03

  • スピントロニクス

    福岡大学

    2018.04
    -
    2019.03

  • 物理学実験

    慶應義塾大学

    2018.04
    -
    2019.03

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Memberships in Academic Societies 【 Display / hide

  • 電気学会, 

    2016.04
    -
    Present
  • 日本物理学会

     
  • 日本応用物理学会

     
  • The Institute of Erectrical and Electrics Engineering (IEEE

     
  • 日本磁気学会

     

Committee Experiences 【 Display / hide

  • 2016.04
    -
    Present

    ナノスケール磁性体研究会技術調査専門委員, 電気学会

  • 2013.12
    -
    2014.11

    学術講演会現地実行委員, 日本磁気学会

  • 2013.06
    -
    2014.05

    論文賞選考委員, 日本磁気学会

  • 2013.05
    -
    2017.05

    財務委員, 日本磁気学会

  • 2013.05
    -
    2014.03

    プログラム部会 委員, 日本磁気学会

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