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2012 Fiscal Year Final Research Report

Theoretical Design of Non-volatile Memories based onHybrids of Magnets and Dielectrics

Research Project

  • PDF
Project/Area Number 22360014
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionTohoku University

Principal Investigator

SHIRAI Masafumi  東北大学, 電気通信研究所, 教授 (70221306)

Co-Investigator(Kenkyū-buntansha) ODA Tatsuki  金沢大学, 数物科学系, 教授 (30272941)
Co-Investigator(Renkei-kenkyūsha) MIURA Yoshio  東北大学, 電気通信研究所, 助教 (10361198)
Project Period (FY) 2010 – 2012
Keywords不揮発性メモリ / 強磁性体 / 表面・界面 / 磁気異方性 / 電界効果 / 第一原理計算
Research Abstract

We investigated the magneto-crystalline anisotropy (MCA) and its electric-field effect in ferromagnet/oxide films using first-principles calculations and explored structures which show remarkable electric-field effect to establish a data-rewriting based on electric-field induced magnetization reversal in non-volatile spin memories. We found that the interfacial MCA in CoFe/MgO junctions increases with increasing Fe composition. We suggested that the electric-field dependence of MCA at Fe/MgO interface can be enhanced by inserting Pt or Pd monatomic layers.

  • Research Products

    (26 results)

All 2013 2012 2011 2010

All Journal Article (9 results) (of which Peer Reviewed: 9 results) Presentation (16 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] The origin of perpendicular magneto-crystalline anisotropy in L10-FeNi under tetragonal distortion2013

    • Author(s)
      Y. Miura, S. Ozaki, Y. Kuwahara, M. Tsujikawa, K. Abe, M. Shirai
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 25巻 Pages: 106005/1-9

    • DOI

      DOI:10.1088/0953-8984/25/10/106005

    • Peer Reviewed
  • [Journal Article] Enhanced tunnel magnetoresistance in a spinel oxide barrier with cation site disorder2012

    • Author(s)
      H. Sukegawa, Y. Miura, S. Muramoto, S. Mitani, T. Niizeki, T. Ohkubo, K. Abe, M. Shirai, K. Inomata, K. Hono
    • Journal Title

      Physical Review B

      Volume: 86巻 Pages: 184401/1-5

    • DOI

      DOI:10.1103/PhysRevB.86.184401

    • Peer Reviewed
  • [Journal Article] First-principles study of tunneling magnetoresistance in Fe/MgAl2O4/Fe (001) magnetic tunnel junctions2012

    • Author(s)
      Y. Miura, S. Muramoto, K. Abe, M. Shirai
    • Journal Title

      Physical Review B

      Volume: 86巻 Pages: 024426/1-6

    • DOI

      DOI:10.1103/PhysRevB.86.024426

    • Peer Reviewed
  • [Journal Article] Interface atomic structures and magnetic anisotropy of Fe and Pd/Fe monatomic films on Pd(001)2012

    • Author(s)
      T. Ueno, M. Sawada, K. Furumoto, T. Tagashira, S. Tohoda, A. Kimura, S. Haraguchi, M. Tsujikawa, T. Oda, H. Namatame, M. Taniguchi
    • Journal Title

      Physical Review B

      Volume: 85巻 Pages: 224406/1-10

    • DOI

      DOI:10.1103/PhysRevB.85.224406

    • Peer Reviewed
  • [Journal Article] Effect of atomic monolayer insertions on electric-field-induced rotation of magnetic easy axis2012

    • Author(s)
      M. Tsujikawa, S. Haraguchi, T. Oda
    • Journal Title

      Journal of Applied Physics

      Volume: 111巻 Pages: 083910/1-4

    • DOI

      DOI:10.1063/1.3703682

    • Peer Reviewed
  • [Journal Article] First-principles study on ballistic conductance in Co2MnSi/X/Co2MnSi (001) (X = Ag, Au, Al, V, Cr) trilayers2011

    • Author(s)
      Y. Miura, K. Futatsukawa, S. Nakajima, K. Abe, M. Shirai
    • Journal Title

      Physical Review B

      Volume: 84巻 Pages: 134432/1-6

    • DOI

      DOI:10.1103/PhysRevB.84.134432

    • Peer Reviewed
  • [Journal Article] Effects of interfacial noncollinear magnetic structures on spin-dependent conductance in Co_2MnSi/MgO/Co_2MnSi magnetic tunnel junctions: A first-principles study2011

    • Author(s)
      Y. Miura, K. Abe, M. Shirai
    • Journal Title

      Physical Review B

      Volume: 83巻 Pages: 214411/1-6

    • DOI

      DOI:10.1103/PhysRevB.83.214411

    • Peer Reviewed
  • [Journal Article] A comparative ab initio study on electric-field dependence of magnetic anisotropy in MgO/Fe/Pt and MgO/Fe/Au films2011

    • Author(s)
      M. Tsujikawa, S. Haraguchi, T. Oda, Y. Miura, M. Shirai
    • Journal Title

      Journal of Applied Physics

      Volume: 109巻 Pages: 07C107/1-3

    • DOI

      DOI:10.1063/1.3540677

    • Peer Reviewed
  • [Journal Article] Electric-field effects on magnetic anisotropy in Pd/Fe/Pd (001) surface2011

    • Author(s)
      S. Haraguchi, M. Tsujikawa, J. Gotoh, T. Oda
    • Journal Title

      Journal of Physics D: Applied Physics

      Volume: 44巻 Pages: 064005/1-8

    • DOI

      DOI:10.1088/0022-3727/44/6/064005

    • Peer Reviewed
  • [Presentation] Ab initio studies on half-metallic Heusler alloys: An outlook toward room-temperature applications (招 待講演)2012

    • Author(s)
      M. Shirai
    • Organizer
      International Conference of the Asian Union of Magnetics Societies 2012
    • Place of Presentation
      奈良
    • Year and Date
      2012-10-02
  • [Presentation] Interfacial magnetic anisotropy of junctions between Fe and transition-metal nitrides or carbides: A first-principles study2012

    • Author(s)
      M. Tsujikawa
    • Organizer
      19th International Conference on Magnetism with Strongly Correlated Electron Systems
    • Place of Presentation
      プサン(韓国)
    • Year and Date
      2012-07-13
  • [Presentation] A first-principles study on spin-dependent tunneling conductance in magnetic tunnel junctions with spinel-type MgAl2O4 barrier2012

    • Author(s)
      Y. Miura
    • Organizer
      19th International Conference on Magnetism with Strongly Correlated Electron Systems
    • Place of Presentation
      プサン(韓国)
    • Year and Date
      2012-07-12
  • [Presentation] The origin of electric-field effects on magnetic anisotropy in FePd ultrathin film2012

    • Author(s)
      T. Oda
    • Organizer
      19th International Conference on Magnetism with Strongly Correlated Electron Systems
    • Place of Presentation
      プサン(韓国)
    • Year and Date
      2012-07-09
  • [Presentation] Magnetic anisotropy and its electric field effect of MgO/FeCo interfaces: A first principles study2012

    • Author(s)
      M. Tsujikawa
    • Organizer
      9th RIEC International Workshop on Spintronics
    • Place of Presentation
      仙台
    • Year and Date
      2012-06-01
  • [Presentation] A first-principles study on magneto-crystalline anisotropy at interfaces of magnetic tunnel junctions(招待講演)2012

    • Author(s)
      Y. Miura
    • Organizer
      9th RIEC International Workshop on Spintronics
    • Place of Presentation
      仙台
    • Year and Date
      2012-05-31
  • [Presentation] First-principles study of magnetic anisotropy of MgO/FeCo interfaces and its electric-field effect2012

    • Author(s)
      M. Tsujikawa
    • Organizer
      IEEE International Magnetics Conference2012
    • Place of Presentation
      バンクーバー(カ ナダ)
    • Year and Date
      2012-05-10
  • [Presentation] First-principles calculations of magneto-crystalline anisotropy in Co_2FeAl/MgO junctions2012

    • Author(s)
      M. Shirai
    • Organizer
      IEEE International Magnetics Conference 2012
    • Place of Presentation
      バンクーバー(カナダ)
    • Year and Date
      2012-05-10
  • [Presentation] Ab initio study on magnetic anisotropy of L10-ordered alloy FeNi2011

    • Author(s)
      S. Ozaki
    • Organizer
      56th Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      ス コッツデール(米国)
    • Year and Date
      2011-11-01
  • [Presentation] Electric-field modulation of magnetic anisotropy at surfaces and interfaces2011

    • Author(s)
      M. Tsujikawa
    • Organizer
      International Focus Workshop on Quantum Simulations and Design
    • Place of Presentation
      ドレスデン(ド イツ)
    • Year and Date
      2011-09-29
  • [Presentation] Magnetic anisotropy and its electric field effect in the magnetic films2011

    • Author(s)
      T. Oda
    • Organizer
      International Focus Workshop on Quantum Simulations and Design
    • Place of Presentation
      ドレスデン(ドイツ)
    • Year and Date
      2011-09-29
  • [Presentation] Electric field modulation of magnetic anisotropy in MgO/Fe-Pt thin films2011

    • Author(s)
      M. Tsujikawa
    • Organizer
      5th International Workshop on Spin Currents
    • Place of Presentation
      仙台
    • Year and Date
      2011-07-27
  • [Presentation] Electric field effects on magnetic anisotropy in MgO/Pt/Fe/Pt (001): A density-functional study2010

    • Author(s)
      M. Tsujikawa
    • Organizer
      55th Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      ア トランタ(米国)
    • Year and Date
      2010-11-16
  • [Presentation] Electric field effects on magnetic anisotropy of ferromagnetic/ dielectric film2010

    • Author(s)
      M. Tsujikawa
    • Organizer
      Psi-k Conference 2010
    • Place of Presentation
      ベルリン(ドイツ)
    • Year and Date
      2010-09-14
  • [Presentation] Electric-field effect on the magnetic anisotropy of the ferromagnetic/dielectric films: A first-principles study (招待講演)2010

    • Author(s)
      T. Oda
    • Organizer
      International Symposium on Advanced Magnetic Materials and Applications 2010
    • Place of Presentation
      仙台
    • Year and Date
      2010-07-15
  • [Presentation] Electric-field effect on magnetic anisotropy in the thin films: A first-principles study2010

    • Author(s)
      M. Tsujikawa
    • Organizer
      International Symposium on Advanced Magnetic Materials and Applications 2010
    • Place of Presentation
      仙台
    • Year and Date
      2010-07-15
  • [Patent(Industrial Property Rights)] 不揮発性磁気抵抗メモリ素子、不揮発性磁気抵抗メモリ装置、及び不揮発性磁気抵 抗メモリ素子の書き込み方法2012

    • Inventor(s)
      小田竜樹、原口辰也
    • Industrial Property Rights Holder
      国立大学法人 金沢大学
    • Industrial Property Number
      特許2012-163254
    • Filing Date
      2012-07-24

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Published: 2014-08-29  

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