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2006 Fiscal Year Final Research Report Summary

Creation of ferroelectric relaxor superlattices with symmetry braking and brain mimetic memory

Research Project

Project/Area Number 16360154
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionThe University of Tokyo (2006)
Osaka University (2004-2005)

Principal Investigator

TABATA Hitoshi  The University of Tokyo, Department of Electronic Engineering, Professor (00263319)

Project Period (FY) 2004 – 2006
Keywordsrelaxor / artificial superlattices / spinglass / spinel / garnet
Research Abstract

Superlattices of transition metal oxides have been formed by a laser Molecular Beam Epitaxy (MBE) technique connected with RHEED monitoring system. The superlattices of magnetics have been constructed on SrTiO_3(100), (110) and (111) surfaces. These surface selection enables us to control the three dimensional positioning of atoms and spin. In the case of LaCrO_3/LaFeO_3 superlattices on (111) surface, ferromagnetism has been realized for the first time. In the case of LaMnO_3/LaFeO_3 superlattices, on the other hand, spin frustration is expected competing with ferromagnetism of self-doped LaMnO_3 and anti-ferromagnetism of LaFeO_3 on SrTiO_3 (100) surface. Spin glass phase transition (casp shape in magnetization vs. temperature measurements) is observed in the case of LaMnO_3/LaFeO_3 superlattices. It is due to the spin frustration between ferromagnetic couping in LaMnO_3 layer and antiferromagnetic coupling in LaFeO_3 layer.

  • Research Products

    (22 results)

All 2007 2006

All Journal Article (21 results) Book (1 results)

  • [Journal Article] Simultaneous control of growth mode and ferromagnetic ordering in Co-doped ZnO layers with Zn polarity2007

    • Author(s)
      H. Matsui
    • Journal Title

      Physical Review B 75

      Pages: 014438

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Co-doped ZnO homoepitaxy : Repeated oxygen-pressure modulated epitaxy2007

    • Author(s)
      H. Matsui
    • Journal Title

      Physica Status Solidi C 3

      Pages: 4106-4109

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Simultaneous control of growth mode and ferromagnetic ordering in Co-doped ZnO layers with Zn polaritv2007

    • Author(s)
      H. Matsui, H. Tabata
    • Journal Title

      Physical Review B 75 014438

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Co-doped ZnO homoepitaxy : Repeated oxygen-pressure modulated epitaxy2007

    • Author(s)
      H. Matsui, H. Tabata
    • Journal Title

      Physica Status Solidi C 3

      Pages: 4106-4109

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Influence of Microstructure on the Complex Permeability of Spinel Type Ni-Zn Ferrite2006

    • Author(s)
      S. T. Mahmuda
    • Journal Title

      J. Magnetism & Magnetic Materials 305

      Pages: 269-274

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Stranski-Krastanov growth in Mg0.37Zn0.63O/ZnO heteroepitaxy : Self-organized nanodots and local composition separation2006

    • Author(s)
      H. Matsui
    • Journal Title

      Appl. Phys. Lett. 89

      Pages: 091909

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Novel DNA Nano-Patterning Design Method Utilizing Poly-L-Lysine Patterning by Nanoimprint Lithography2006

    • Author(s)
      T. Ohtake
    • Journal Title

      J. Nanosci. Nanotechnol. 6

      Pages: 2187-2190

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Correlation of self-organized surface nanostructures and anisotropic electron transport in nonpolar ZnO (10-10) homoepitaxy2006

    • Author(s)
      H. Matsui
    • Journal Title

      J. Appl. Phys. 99

      Pages: 124307

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Dielectric and ferroelectric properties of c-axiis oriented strontium bismuth tantalate thin films applied transverse electric fields2006

    • Author(s)
      K. Kotani
    • Journal Title

      J. Appl. Phys. 99

      Pages: 124106

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Modification of Temperature Dependence of Dielectric Properties by Symmetry-Controlled Superlattices Thin Films of BaZr_xTi_<1-x>O_32006

    • Author(s)
      T. Kawahara
    • Journal Title

      Jpn. J. Appl. Phys. 45

      Pages: 4484-4488

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Critical thickness and lattice relaxation of Mg-rich strained Mg_<0.37>Zn_<0.63>O (0001) layers towards multi-quantum-wells2006

    • Author(s)
      H. Matsui
    • Journal Title

      J. Appl. Phys. 99

      Pages: 024902

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 酸化亜鉛半導体薄膜の光・電子・磁気機能-極性・非極性の観点から-2006

    • Author(s)
      松井裕章
    • Journal Title

      応用物理 75

      Pages: 1211-1217

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 酸化物半導体ZnO薄膜の成長表面と格子欠陥2006

    • Author(s)
      松井裕章
    • Journal Title

      表面科学 27

      Pages: 708-714

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 強誘電体薄膜BaZrxTil-xO3の超格子による温度特性の制御2006

    • Author(s)
      河原敏男
    • Journal Title

      超音波TECHNO 9-10

      Pages: 31-34

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Influence of Microstructure on the Complex Permeability of Sninel Tyne, Ni-Zn Ferrite2006

    • Author(s)
      S. T. Mahmuda Hosain, H. Tabata
    • Journal Title

      J. Magnetism & Magnetic Materials 305

      Pages: 269-274

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Stranski-Krastanov growth in Mg0.37Zn0.63O/ZnO heteroepitaxy : Self-organized nanodots and local composition separation2006

    • Author(s)
      H. Matsui, H. Tabata
    • Journal Title

      Appl. Phys. Lett. 89, 091909

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Novel DNA Nano-Patterning Design Method Utilizing Poly-L-Lysine Patterning bv Nanoimprint Lithography2006

    • Author(s)
      T. Ohtake, H. Tabata
    • Journal Title

      J. Nanosci. Nanotechnol. 6

      Pages: 2187-2190

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Correlation of self-organized surface nanostructures and anisotropic electron transport in nonpolar ZnO (10-10) homoepitaxv2006

    • Author(s)
      H. Matsui, H. Tabata
    • Journal Title

      J. Appl. Phys. 99, 124307

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Dielectric and ferroelectric properties of c-axis oriented strontium bismuth tantalate thin films applied transverse electric fields2006

    • Author(s)
      K. Kotani, A. Fujimori, H. Tabata
    • Journal Title

      J. Appl. Phys. 99, 124106

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Modification of Temperature Dependence of Dielectric Properties by Symmetry-Controlled Superlattices Thin Films of BaZr_xTi_1-xO_32006

    • Author(s)
      T. Kawahara, H. Tabata
    • Journal Title

      Jpn. J. Appl. Phys. 45

      Pages: 4484-4488

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Critical thickness and lattice relaxation of Mg-rich strained Mg_0.37Zn0.63O(0001)layers towards multi-quantum-wells2006

    • Author(s)
      H. Matsui, H. Tabata
    • Journal Title

      J. Appl. Phys. 99 024902

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] 科学立国日本を築く2006

    • Author(s)
      田畑仁
    • Total Pages
      325
    • Publisher
      日刊工業新聞社
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2010-06-09  

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