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Creation of room temperature half-metallic magnetic tunnel junction having a spinel crystal structure

Research Project

Project/Area Number 25790039
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Applied materials
Research InstitutionTohoku University

Principal Investigator

NIIZEKI Tomohiko  東北大学, 原子分子材料科学高等研究機構, 助教 (40567749)

Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsスピネル / マグネタイト / 強磁性トンネル接合 / ハーフメタル / 酸化物 / フェライト / トンネル磁気抵抗効果
Outline of Final Research Achievements

Towards the creation of room temperature half-metal ferromagnetic tunnel junction using Magnetite (Fe3O4) which is the spinel-type oxide material and is expected to be half-metallic from the theoretical calculation as the electrodes and a transition metal oxide having the same spinel structure as a barrier, we established the elemental technologies. First, we have succeeded in producing a very flat substrate by heat treatment of the MgO substrate. Then performed a selection of the barrier layer. Although CoCr2O4 which was originally planned was found to be ineligible , MgTi2O4 was found to be excellent as a barrier material in terms of surface morphology as well as crystallinity. Furthermore, Fe3O4 as electrodes and CoFe2O4 as the magnetic pinning layer have been successfully selectively grown with high accuracy just by the control of the oxygen flow rate, respectively.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (10 results)

All 2015 2014 2013

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Acknowledgement Compliant: 3 results,  Open Access: 1 results) Presentation (6 results)

  • [Journal Article] Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films2015

    • Author(s)
      T. Niizeki, T. Kikkawa, K. Uchida, M. Oka, K. Z. Suzuki, H. Yanagihara, E. Kita, E. Saitoh
    • Journal Title

      AIP Advances

      Volume: 5 Issue: 5 Pages: 053603-053603

    • DOI

      10.1063/1.4916978

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Vacancy-site existence in Fe-rich cobalt ferrite epitaxial thin films revealed by x-ray magnetic circular dichroism2015

    • Author(s)
      Tomohiko Niizeki, Yuji Utsumi, Makoto Myoka, Hideto Yanagihara, Jun-ichiro Inoue, Goro Shibata, Toshiharu Kadono, Masako Sakamaki, Kenta Amemiya, Tsuneharu Koide, and Eiji Kita
    • Journal Title

      Applied Physics Letters

      Volume: -

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Magnetic properties of cobalt ferrite (001) films grown on spinel-type buffer layers2015

    • Author(s)
      Yuki Hisamatsu, Tomohiko Niizeki, Hideto Yanagihara, and Eiji Kita
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: -

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt- ferrite CoxFe3xO4(001) (x=0.75, 1.0) thin films2014

    • Author(s)
      Tomohiko Niizeki, Yuji Utsumi, Ryohei Aoyama, Hideto Yanagihara, Jun-ichiro Inoue, Yuichi Yamasaki, Hironori Nakao, Kazuyuki Koike, and Eiji Kita
    • Journal Title

      Applied Physics Letters

      Volume: 103 Issue: 16 Pages: 162407-162407

    • DOI

      10.1063/1.4824761

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films with different preferential axes2015

    • Author(s)
      Tomohiko Niizeki, Takashi Kikkawa, Ken-ichi Uchida, Mineto Oka, Kazuya Z. Suzuki, Hideto Yanagihara, Eiji Kita, and Eiji Saitoh
    • Organizer
      20th International Conference on Magnetism
    • Place of Presentation
      Barcelona (Spain)
    • Year and Date
      2015-07-05 – 2015-07-10
    • Related Report
      2014 Annual Research Report
  • [Presentation] Observation of spin-Seebeck effect in cobalt-ferrite epitaxial film2015

    • Author(s)
      Tomohiko Niizeki, Takashi Kikkawa, Ken-ichi Uchida, Mineto Oka, Kazuya Z. Suzuki, Hideto Yanagihara, Eiji Kita, and Eiji Saitoh
    • Organizer
      The AIMR International Symposium 2015 (AMIS2015)
    • Place of Presentation
      Sendai International Center (Japan)
    • Year and Date
      2015-02-17 – 2015-02-19
    • Related Report
      2014 Annual Research Report
  • [Presentation] Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin film2014

    • Author(s)
      Tomohiko Niizeki, Takashi Kikkawa, Ken-ichi Uchida, Eiji Saitoh, Mineto Oka, Kazuya Z. Suzuki, Hideto Yanagihara, and Eiji Kita
    • Organizer
      59th Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      Honolulu (Hawaii)
    • Year and Date
      2014-11-03 – 2014-11-07
    • Related Report
      2014 Annual Research Report
  • [Presentation] Observation of spin-Seebeck effect in cobalt-ferrite epitaxial thin film2014

    • Author(s)
      Tomohiko Niizeki, Takashi Kikkawa, Ken-ichi Uchida, Eiji Saitoh, Mineto Oka, Kazuya Z. Suzuki, Hideto Yanagihara, and Eiji Kita
    • Organizer
      第75回 日本応用物理学会 秋季講演会
    • Place of Presentation
      北海道大学 (北海道)
    • Year and Date
      2014-09-17 – 2014-09-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] 高垂直磁気異方性コバルトフェライト (001) 薄膜におけるカチオン価数・サイト分布2014

    • Author(s)
      新関智彦, 内海優史, 柳原英人, 井上順一郎, 芝田悟朗, 門野利治, 酒巻真粧子, 雨宮健太, 小出常晴, 喜多英治
    • Organizer
      第38回 日本磁気学会学術講演会
    • Place of Presentation
      慶應義塾大学 日吉キャンパス (神奈川県)
    • Year and Date
      2014-09-02 – 2014-09-05
    • Related Report
      2014 Annual Research Report
  • [Presentation] コバルトフェライト(001)薄膜における垂直磁気異方性の下地依存性2013

    • Author(s)
      久松裕季,新関智彦,柳原英人,喜多英治
    • Organizer
      第37回 日本磁気学会学術講演会
    • Place of Presentation
      北海道大学工学部
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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