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Fabrication of self-assembled lateral nanostructures and their applications for magnetic materials

Research Project

Project/Area Number 16206067
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionTohoku University

Principal Investigator

TAKANASHI Koki  Tohoku University, Institute for Materials Research, Professor, 金属材料研究所, 教授 (00187981)

Co-Investigator(Kenkyū-buntansha) MITANI Seiji  Tohoku University, Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (20250813)
SHIMA Toshiyuki  Tohoku Gakuin University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50261508)
YOSHIMI Kyosuke  Tohoku University, Graduate School of Environmental study, Associate Professor, 大学院環境科学研究科, 助教授 (80230803)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥50,180,000 (Direct Cost: ¥38,600,000、Indirect Cost: ¥11,580,000)
Fiscal Year 2006: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2005: ¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2004: ¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000)
KeywordsNanostructured Materials / superlattice / magnetic recording / quantum dot / spin electronics / self assembly / self organization / film growth / 磁性薄膜 / 人工格子 / 変調構造 / 磁気特性 / ナノドット / 点欠陥
Research Abstract

Magnetic nanostructures with lateral modulation were prepared by molecular beam epitaxy and UHV magnetron sputtering, and their magnetic, magnetotransport and magnetooptical properties etc. were investigated. The main results obtained in this study are as follows:
1.Self assembled Fe nanoparticles were formed on a thin MgO layer which is epitaxially grown on a Fe buffer with an optimum thickness, and it was found by scanning tunneling microscopy observations that the Fe nanoparticles were alingned in a [110] direction. Cross sectional high-resolution electron microscopy observation suggested that an aligned pyramid structure of the Fe buffer caused the lateral alignment of Fe nanoparticles.
2.Preparation of FePt films on FeAl single crystal surfaces with nano.pores were attempted by using both bulk and thin film processes. Magnetic properties of obtained FePt films were measured and the effects of pores on properties of FePt films were systematically investigated.
3.By optimized heat treatments for alternate stacking of FePt and MgO, tetrahedral FePt nanoparticles embedded partially in MgO were successfully synthesized. The formed FePt nanoparticles showed a large coercive force, suggesting an application of magnetic probe microscopy.
4.Novel surface structures such as rectangular holes and network structures were successfully prepared for NiO thin films by oxygen reactive sputtering. The observed structures are expected to be used for a template for lateral nanostructures.
5.Surface phase separation was investigated for ultrathin Fe-Au alloys deposited on a Pt(100) surface. A few kinds of novel lateral nanostructures were observed by scanning tunneling micropcopy.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (21 results)

All 2007 2006 2005 2004

All Journal Article (21 results)

  • [Journal Article] Structure and magnetic properties for L10-ordered FeNi films prepared by alternate monatomic layer deposition2007

    • Author(s)
      T.Shima
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310

      Pages: 2213-2214

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Epitaxial growth of L10-FePt/MgO/L10-FePt trilayer structures2007

    • Author(s)
      M.Hagiuda
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310

      Pages: 1905-1907

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Nucleation-type magentization behavior in FePt(001) particulate films2006

    • Author(s)
      T.Shima
    • Journal Title

      Journal of Applied Physics 99

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Formation of octahedral FePt nanoparticles by alternate deposition of FePt and MgO2006

    • Author(s)
      T.Shima
    • Journal Title

      Applied Physics Letters 88

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Magnetic properties of L10 ordered FePt films prepared on a Fe-Si-B-Nb-Cu soft magnetic underlayer2006

    • Author(s)
      I.Fujii
    • Journal Title

      Materials Transaction 47

      Pages: 47-51

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Self-assembled metallic nanoparticles for spin dependent single electron tunneling2006

    • Author(s)
      F.Ernult
    • Journal Title

      Phase Transitions 79

      Pages: 717-726

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Dot size dependence of magnetic properties in microfabricated L10-FePt (001) and L10-FePt (110) dot arrays2006

    • Author(s)
      T.Seki
    • Journal Title

      Journal of Applied Physics 100

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Dot size dependence of magnetic properties in microfabricated L10-FePt(001) and L10-FePt(110) dot arrays2006

    • Author(s)
      T.Seki
    • Journal Title

      Journal of Applied Physics 100

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Enhanced spin accumulation and novel magnetotransport in nanoparticles2005

    • Author(s)
      K.Yakushiji
    • Journal Title

      Nature Materials 4

      Pages: 57-61

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Mechanism of magnetization process of island-like L10 FePt films2005

    • Author(s)
      G.Q.Li
    • Journal Title

      Journal of Magnetism and Magnetic Materials 287

      Pages: 219-223

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Self-alignment of Fe nanoparticles on a tunnel barrier2005

    • Author(s)
      F.Ernult
    • Journal Title

      Applied Physics Letters 87

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Improvement of hard magnetic properties in microfabricated L 10-FePt dot arrays upon post-annealing2005

    • Author(s)
      T.Seki
    • Journal Title

      IEEE Transaction on Magnetism 41

      Pages: 3604-3606

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Control of the size for octahedral FePt nanoparticles and their magnetic properties2005

    • Author(s)
      H.Ito
    • Journal Title

      IEEE Transaction on Magnetism 41

      Pages: 3373-3375

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Self-alignment of Fe nanoparticles on a tunnel barrier2005

    • Author(s)
      F.Emult
    • Journal Title

      Applied Physics Letters 87

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Improvement of hard magnetic properties in microfabricated L10-FePt dot arrays upon post-annealing2005

    • Author(s)
      T.Seki
    • Journal Title

      IEEE Transaction on Magnetism 41

      Pages: 3604-3606

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Improvement of hard magnetic properties in microfabricated L10-FePt dot arrays upon post-annealing2005

    • Author(s)
      T.Seki
    • Journal Title

      IEEE Transaction on Magnetics 41

      Pages: 3604-3606

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Control of the size for octahedral FePt nanoparticles and their magnetic properties2005

    • Author(s)
      T.Ito
    • Journal Title

      IEEE Transaction on Magnetics 41

      Pages: 3373-3375

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Enhanced spin acuumulation and novel magnetotransport in nanoparticles2005

    • Author(s)
      K.Yakushiji et al.
    • Journal Title

      Nature Mater. 4

      Pages: 57-61

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Mechanism of magnetization process of island-like L10 FePt films2005

    • Author(s)
      G.Q.Li et al.
    • Journal Title

      J.Magn.Magn.Mater. 287

      Pages: 219-223

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Coercivity exceeding 100 kOe in epitaxially grown FePt sputtered films2004

    • Author(s)
      T.Shima
    • Journal Title

      Applied Physics Letters 85

      Pages: 2571-2573

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Coercivity exceeding 100 kOe in epitaxially grown FePt sputtered films2004

    • Author(s)
      T.Shima et al.
    • Journal Title

      Appl.Phys.Lett. 85

      Pages: 2571-2573

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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