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2006 Fiscal Year Final Research Report Summary

Development of magnetization reversal technique at low power consumption using a stress-induced magnetic anisotropy for perpendicular MRAM

Research Project

Project/Area Number 17360137
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionTokyo Institute of Technology

Principal Investigator

NAKAGAWA Shigeki  Tokyo Institute of Technology, Dept. of Physical Electronics, Associate Professor, 大学院・理工学研究科, 助教授 (60180246)

Project Period (FY) 2005 – 2006
KeywordsMagnetic Random Access Memory / MRAM / Perpendicular MRAM / Inverse magneto-strictive effect / Stress-induced magnetization reversal / Anomalous Hall effect / DyFeCo / Perpendicularly magnetized films
Research Abstract

Thin films with perpendicular magnetic anisotropy have a potential to achieve high-density cell arrangements as a perpendicular magnetic random access memory (p-MRAM). We have demonstrated a new method to reduce perpendicular coercivity of DyFeCo films using a stress-induced magnetic anisotropy. An isotropic stress applied to in-plane direction of the film was so effective to cause reduction of perpendicular magnetic anisotropy during the writing process if the film has large magnetostriction constant. In this study, we have succeeded to cause magnetization reversal at low magnetic field as low as 1/6 of original coercivity of the film. Magnetization processes of the films were measured using anomalous Hall effects and in-plane stress to the films was induced by a mechanical indentation method. It is observed that about 500 Oe of magnetic field in the reverse direction is enough to reverse completely the magnetization of the film which has an original coercivity of 3.3 kOe if the in-plane stress is applied to the film. This technique is applicable to the writing process of p-MRAM with wide writing margin at low power consumption.

  • Research Products

    (42 results)

All 2007 2006 2005

All Journal Article (42 results)

  • [Journal Article] Improvement of in-plane anisotropy field in FeCoB/NiFe/Si thin films by Kr sputtering2007

    • Author(s)
      A.Hashimoto, S.Ito, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310・2

      Pages: 2636-2637

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Magnetization reversal process of DyFeCo films under an addition of mechanical stress for application of MRAM2007

    • Author(s)
      M.Yamada, N.Tokuriki, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310・2

      Pages: 2618-2620

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evaluation of magnetization behavior of Soft/RE-TM layer for perpendicular MRAM by anomalous Hall effect2007

    • Author(s)
      Tomoya Hatori, Shigeki Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310・2

      Pages: 1657-1659

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Fabrication of CoCrPt-SiO_2 films on flexible tape substrate using facing target sputtering system2007

    • Author(s)
      H.Fujiura, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310・2

      Pages: 2659-2661

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Improvement of soft magnetic properties of Si/NiFe/FeCoB thin films at GHz band frequency range by multilayer configuration2007

    • Author(s)
      A.Hashimoto, S.Nakagawa, M.Yamaguchi
    • Journal Title

      IEEE Trans, on Magn. 43・6

      Pages: 2627-2629

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] MTJ elements with MgO barrier using RE-TM amorphous layers for perpendicular MRAM2007

    • Author(s)
      Tomoya Hatori, Hideto Ohmori, Masaru Tada, Shigeki Nakagawa
    • Journal Title

      IEEE Trans, on Magn. 43・6

      Pages: 2331-2333

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Magnetization reversal technique of DyTbFeCo films at magnetic field as low as 1/6 of coercivity using a stress-induced magnetic anisotropy2007

    • Author(s)
      Michiya Yamada, Shigeki Nakagawa
    • Journal Title

      IEEE Trans, on Magn. 43・6

      Pages: 2346-2348

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Improvement of in-plane anisotropy field in FeCoB/NiFe/Si thin films by Kr sputtering2007

    • Author(s)
      A.Hashimoto, S.Ito, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials Vol.310, No.2

      Pages: 2636-2637

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Magnetization reversal process of DyFeCo films under an addition of mechanical stress for application of MRAM2007

    • Author(s)
      M.Yamada, N.Tokuriki, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials Vol.310, No.2

      Pages: 2618-2620

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evaluation of magnetization behavior of Soft/RE-TM layer for perpendicular MRAM by anomalous Hall effect2007

    • Author(s)
      Tomoya Hatori, Shigeki Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials Vol.310, No.2

      Pages: 1657-1659

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Fabrication of CoCrPt-SiO2 films on flexible tape substrate using facing target sputtering system2007

    • Author(s)
      H.Fujiura, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials Vol.310, No.2

      Pages: 2659-2661

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Improvement of soft magnetic properties of Si/NiFe/FeCoB thin films at GHz band frequency range by multilayer configuration2007

    • Author(s)
      A.Hashimoto, S.Nakagawa, M.Yamaguchi
    • Journal Title

      IEEE Trans. on Magn. Vol.43, No.6

      Pages: 2627-2629

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] MTJ elements with MgO barrier using RE-TM amorphous layers for perpendicular MRAM2007

    • Author(s)
      Tomoya Hatori, Hideto Ohmori, Masaru Tada, Shigeki Nakagawa
    • Journal Title

      IEEE Trans. on Magn. Vol.43, No.6

      Pages: 2331-2333

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Magnetization reversal technique of DyTbFeCo films at magnetic field as low as 1/6 of coercivity using a stress-induced magnetic anisotropy2007

    • Author(s)
      Michiya Yamada, Shigeki Nakagawa
    • Journal Title

      IEEE Trans. on Magn. Vol.43, No.6

      Pages: 2346-2348

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Stress Induced Enhancement of Magnetization Reversal Process of DyFeCo Films With Perpendicular Magnetization2006

    • Author(s)
      S.Nakagawa, M.Yamada, N.Tokuriki
    • Journal Title

      IEEE Transactions on Magnetics 42(11)

      Pages: 3773-3775

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Magnetization reversal enhancement using stress-induced effects for RE-TM perpendicularly magnetized thin films2006

    • Author(s)
      M.Yamada, S.Nakagawa
    • Journal Title

      The 8th Asian Symposium on Information Storage Technology (ASIST-8)電子情報通信学会技術研究報告 MR2006

      Pages: 56-61

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effects of Ru under layer for CoCrPt-SiO_2 magnetic recording tape media2006

    • Author(s)
      H.Fujiura, M.Anuar, S.Nakagawa
    • Journal Title

      The 8th Asian Symposium on Information Storage Technology (ASIST-8)電子情報通信学会技術研究報告 MR2006

      Pages: 41-44

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] RF-Facing Targets Sputtering System for Deposition of Oxide Thin Films2006

    • Author(s)
      Mitsuru Nagasawa, Kazuhiro TAMAI, Koji Nomura, Yuji Murashima, Shigeki Nakagawa
    • Journal Title

      14th Annual International Conference on Composites/Nano Engineering (ICCE-14) Proceedings of ICCE-14 2c, OXIDE 1

      Pages: 6

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] BST(Ba_<0.5>Sr_<0.5>TiO_3) Thin Films Prepared at Low Sputtering Gas Pressure by RF-Facing Targets Sputtering2006

    • Author(s)
      Kazuhiro TAMAI, Mitsuru Nagasawa, Koji Nomura, Yuji Murashima, Shigeki Nakagawa
    • Journal Title

      14th Annual International Conference on Composites/Nano Engineering (ICCE-14) Proceedings of ICCE-14 2c, OXIDE 1

      Pages: 5

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Trial to Deposit (001) Oriented FePt Thin Films in as-Deposited State using Fe/Pt Bilayered Structure2006

    • Author(s)
      J.Ikemoto, T.Kitagawa, T.Kamiki, S.Nakagawa
    • Journal Title

      Proceedings of MORIS2006 WeX

      Pages: 9

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Influence of spin polarization enhancement layer to rare earth-transition metal thin films for perpendicular tunneling magnetoresistance evaluated by ferromagnetic Hall effect2006

    • Author(s)
      T.Hatori, M.Okuda, S.Nakagawa
    • Journal Title

      J.Appl.Phys. 99[8]

      Pages: C513

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Magnetization reversal enhancement using stress-induced effects for RE-TM perpendicularly magnetized thin films2006

    • Author(s)
      M.Yamada, S.Nakagawa
    • Journal Title

      The 8th Asian Symposium on Information Storage Technology (ASIST-8)(IEICE technical Report) MR2006

      Pages: 56

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effects of Ru under layer for CoCrPt-Si02 magnetic recording tape media2006

    • Author(s)
      H.Fujiura, M.Anuar, S.Nakagawa
    • Journal Title

      The 8th Asian Symposium on Information Storage Technology (ASIST-8) (IEICE technical Report) MR2006

      Pages: 41

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] RF-Facing Targets Sputtering System for Deposition of Oxide Thin Films2006

    • Author(s)
      Mitsuru Nagasawa, Kazuhiro TAMAI, Koji Nomura, Yuji Murashima, Shigeki Nakagawa
    • Journal Title

      14th Annual International Conference on Composites/Nano Engineering (ICCE-14)(Proceedings of ICCE-14) 2c

      Pages: OXIDE 1, 6

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] BST(Ba0.5Sr0.5TiO3) Thin Films Prepared at Low Sputtering Gas Pressure by RF-Facing Targets Sputtering2006

    • Author(s)
      Kazuhiro TAMAI, Mitsuru Nagasawa, Koji Nomura, Yuji Murashima Shigeki Nakagawa
    • Journal Title

      14th Annual International Conference on Composites/Nano Engineering (ICCE-14)(Proceedings of ICCE-14) 2c

      Pages: OXIDE 1, 5

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Trial to Deposit (001) Oriented FePt Thin Films in as-Deposited State using Fe/Pt Bilayered Structure2006

    • Author(s)
      J.Ikemoto, T.Kitagawa, T.Kamiki, S.Nakagawa
    • Journal Title

      Proceedings of MORIS2006 WeX-09

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Influence of spin polarization enhancement layer to rare earth-transition metal thin films for perpendicular tunneling magnetoresistance evaluated by ferromagnetic Hall effect2005

    • Author(s)
      T.Hatori, M.Okuda, S.Nakagawa
    • Journal Title

      J. Appl. Phys. 99[8]

      Pages: 513-515

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Development of RF-Facing Targets Sputtering System for Deposition of Oxide Films2005

    • Author(s)
      Mitsuru Nagasawa, Keisuke Matsuno, Shigeki Nakagawa
    • Journal Title

      Proceedings of the 8th International Symposium on Sputtering & Plasma Processes TF

      Pages: 3-4

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Magnetic interactions in FePt/soft magnetic underlayer double-layered structure observed by anomalous Hall effect2005

    • Author(s)
      Sarbanoo Das, Sukefumi Ito, Taku Kitagawa, Shigeki Nakagawa
    • Journal Title

      J. Appl. Phys. 97[10]

      Pages: 511-513

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] FeCoB thin films with high anisotropy field suitable for GHz band operation2005

    • Author(s)
      A.Hashimoto, S.Ito, S.Nakagawa, M.Yamaguchi
    • Journal Title

      4th International Workshop on High Frequency Micromagnetic Devices and Materials (MMDM4)

      Pages: 08-2

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hall effect study of soft magnetic properties of thin films (FeCoB, NiFe) stacked on FePt thin films with perpendicular magnetic anisotropy2005

    • Author(s)
      S.Das, T.Hatori, S.Ito, T.Kitagawa, S.Nakagawa
    • Journal Title

      Digests of the IEEE International Magnetics 2005

      Pages: 863-864

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Fe(100) formation in Fe/Pt bilayers to attain [001] orientation of FePt ordered alloy thin films in as-deposited state2005

    • Author(s)
      T.Kitagawa, T.Kamiki, S.Nakagawa
    • Journal Title

      Digests of the IEEE International Magnetics Conference 2005

      Pages: 871-872

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Highly (001) Oriented FePt Ordered Alloy Thin Films Fabricated from Pt(100)/Fe(100) Structure on Glass Disks without Seed Layers2005

    • Author(s)
      Shigeki Nakagawa, Taro Kamiki
    • Journal Title

      Journal of Magnetism and Magnetic Materials 287

      Pages: 204-209

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of Roughness and Continuity of Co layers to Magnetic Properties of Co/Pd Multilayers2005

    • Author(s)
      Shigeki Nakagawa, Hironori Yoshikawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials 287

      Pages: 193-198

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Fe-Co-B/[Ni-Fe/Si] Soft Magnetic Underlayer with High Anisotropy Field along Cross Track Direction on Disk Substrate2005

    • Author(s)
      S.Das, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials 287

      Pages: 281-286

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] An approach to estimate the magnetic anisotropy constants in a CoCrPt recording layer with a NiFe soft underlayer2005

    • Author(s)
      S.Das, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials 287

      Pages: 308-313

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Study of magnetization reversal phenomena in CoCrTaPt perpendicular recording thin film media in a tilted magnetic field2005

    • Author(s)
      S.Das, S.Nakagawa
    • Journal Title

      Journal of Magnetism and Magnetic Materials 287

      Pages: 314-319

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Influence of spin polarization enhancement layer to rare earth-transition metal thin films for perpendicular tunneling magnetoresistance evaluated by ferromagnetic Hall effect2005

    • Author(s)
      T.Hatori, M.Okuda, S.Nakagawa
    • Journal Title

      J.Appl.Phys. 99[8]

      Pages: C513

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Development of RF-Facing Targets Sputtering System for Deposition of Oxide Films2005

    • Author(s)
      Mitsuru Nagasawa, Keisuke Matsuno, Shigeki Nakagawa
    • Journal Title

      Proceedings of the 8th International Symposium on Sputtering & Plasma Processes TF 3-4

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Magnetic interactions in FePt/soft magnetic underlayer double-layered structure observed by anomalous Hall effect2005

    • Author(s)
      Sarbanoo Das, Sukefumi Ito, Taku Kitagawa, Shigeki Nakagawa
    • Journal Title

      J.Appl.Phys. 97[10]

      Pages: N511

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] FeCoB thin films with high anisotropy field suitable for GHz band operation2005

    • Author(s)
      A.Hashimoto, S.Ito, S.Nakagawa, M.Yamaguchi
    • Journal Title

      4th International Workshop on High Frequency Micromagnetic Devices and Materials (MMDM4) Digests of MMDM4

      Pages: 08-2

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Fe(100) formation in Fe/Pt bilayers t attain [001] orientation of FePt ordered alloy thin films in as-deposited state2005

    • Author(s)
      T.Kitagawa, T.Kamiki, S.Nakagawa
    • Journal Title

      Digests of the IEEE International Magnetics Conference 2005

      Pages: 871-872

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2008-05-27  

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