• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study on mesoscopic physical phenomenon in many particle systems by electron holography

Research Project

Project/Area Number 11650671
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionTohoku University

Principal Investigator

KONNO Toyohiko  Tohoku Univ., Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (90260447)

Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1999: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsTransmission electron microscopy / Electron holography / Clusters / Cluster assemblies / Magnetic properties / Tunneling conductivity / Mesoscopic system / 磁性クラスター
Research Abstract

We employed Hitach HF-2000 transmission electron microscopy for electron holography experiments. The biprism wire was installed between the two intermediate lenses of the microscope, and several ten to 100 voltages was applied to the wire. Having confirmed the reproducibility of the interference fringes, we first used latex particles of approximately 1μm in diameter as a specimen. Reconstructed phase images exhibited equipotential curves around the particles, which was interpreted to represent the electrostatic field around the particles. Next, we observed Nd-Fe-B alloy powders with the same technique. From the reconstructed phase image, it was concluded that a magnetic flux of approximately 4.1x10^<-14> Wb penetrated into the about 1μm area of the tip of the specimen.
In addition, we synthesized monodispersive Co/CoO cluster assembly using plasma gas condensation (PGC) technique. This cluster assembly exhibited strong uniaxial magnetic anisotropy. The detailed observation on the magnetic relaxation behavior indicated macroscopic quantum tunneling effect is operating below 8K.In addition, CoAl intermetallic alloy clusters were generated by the PGC technique for the first time. By controlling processing conditions, it was possible to change both the composition and size of the clusters. The Co-rich alloy clusters clearly exhibited ferromagnetic behavior.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (34 results)

All Other

All Publications (34 results)

  • [Publications] T.J.Konno: "Structure and Magnetic Properties of Cosputtered CoC Thin Films"J.Magn.Magn.Maler.. 195. 9-18 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng: "Characteristic Tunnel-Type Conductivity and Magnetoresistance in a CoO-Coated Monodispersive Co Cluster Assembly"Appl.Phys.Lett.. 74. 76-78 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng: "Preparation and Magnetic Properties of Qxide-coated Monodispersive Co Cluster Assembly"Phys.Stat.Sol.(a). 172. 209-216 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 今野豊彦: "磁性クラスター:原子の並び方から電磁場まで"バウンダリー. 15(9). 2-6 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng: "Characteristic Transport properties of CoO-coated Monodispersive Co Cluster Assembly"Phys.Rev.B. 60. 2093-2100 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Hihara: "Study on Co-Cr Alloy Cluster Assembling Process by Magneto-optical Ken Effect"Phys.Stat.Sol.(a). 172. 397-405 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Yamamuro: "Structural and Magnetic Evolution in Self-Assembling Process of Nanometer-sized Co Clusters"Mater.Trans.JIM. 40. 1450-1455 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng: "Magnetic Properties of Monodispersed Co/CoO Clusters"Phys.Rev.B. 61. 3103-3109 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Nasu: "Reduction of Iron-Oxide by ball-milling with hydrogen gas flow"J.Metastable and Nanocrystalline Mater.. 8. 435-440 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Nomura: "Fracture toughness improvement of TiC by Nb and Mo precipitates."J.Mater.Scr.Lett.. 19. 1879-1881 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng: "Co Cluster Coalescence Behavior observed by electrical conduction and transmission electron microscopy"Appl.Phys.Lett.. 78. 1535-1537 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.J.Konno: "Solitting of one electron levels in a Tetrahedral environment"J.Chem.Edu.. 78(in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng, K.Sumiyama, S.Yamamuro, T.Hihara and T.J.Konno: "Characteristic Tunnel-Type Conductivity and Magnetoresistance in a CoO-Coated Monodispersive Co Cluster Assembly"Appl.Phys.Lett.. 74. 76-78 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng, K.Sumiyama, S.Yamamuro, T.Hihara and T.J.Konno: "Preparation and Magnetic Properties of Oxide-coated Monodispersive Co Cluster Assembly."Phys.Stat.Sol.(a). 172. 209-216 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Hihara, K.Sumiyama, T.J.Konno, and K.Wakoh: "Study on Co-Cr Alloy Cluster Assembling Process by Magneto-optical Kerr Effect."Phys.Stat.Sol.(a). 172. 397-405 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.J.Konno, K.Shoji, K.Sumiyama and K.Suzuki: "Structure and Magnetic Properties of Co-sputtered Co-C Thin Films."J.Magn.Magn.Mater.. 195. 9-18 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng, K.Sumiyama, M.Oku, T.J.Konno, K.Wagatsuma and K.Suzuki: "X-ray diffraction and X-ray photoelectron spectra of Fe-Cr-N films deposited by DC reactive sputtering."J.Mat.Sci.. 34. 4623-4628 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng, K.Sumiyama, T.J.Konno, T.Hihara, and S.Yamamuro: "Characteristic Transport Properties of CoO-Coated Monodispersive Co Cluster Assemblies."Phys.Rev.B. 60. 2093-2100 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Yamamuro, K.Sumiyama, T.J.Konno, and K.Suzuki: "Structural and Magnetic Evolution in Self-Assembling Process of Nanometer-Sized Co Clusters."Mater.Trans.JIM. 40. 1450-1455 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng, K.Sumiyama, T.Hihara, S.Yamamuro and T.J.Konno: "Magnetic properties of monodispersed Co/CoO Clusters."Phys.Rev.B. 61. 3103-3109 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Nasu, K.Tokumitus, T.Konno and K.Suzuki: "Reduction of Iron-Oxide by Ball-Milling with Hydrogen Gas Flow."J.Metastable and Nanocrystalline Mater.. 8. 435-440 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.L.Peng, T.J.Konno, K.Wakoh, T.Hihara and K.Sumiyama: "Co cluster coalescence behavior observed by electrical conduction and transmission electron microscopy."Appl.Phys.Lett.. 78. 1535-1537 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Yamamuro: "Strucural and magnetic evolution i nself-assembling process of nanometer-sized Co clusters"Materials Transactions,JIM. 40. 1450-1455 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] D.L.Peng: "Magnetic properties of monodispersed Co/CoO clusters"Physical Review B. 61. 3103-3109 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Nasu: "Reduction of iron-oxide by ball-milling with hydrogen gas flow"Journal of metastable and nanocrystalline materials. 8. 435-440 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Nomura: "Fracture toughness improvement of TiC by Nb and Mo precipitates"Journal of Materials Science Letters. 19. 1879-1881 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.J.Konno: "Guinier-Preston (GP) zone revisited : atomic level observation by haadf-tem technique"Scripta Materialia. 44(in press.). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.J.Konno: "Splitting of one-electron levels in a tetrahedral environment"Journal of Chemical Education. 78(in press.). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.J.Konno: "Electron Diffraction Study on the Long-range Ordered Metastable Fe-Nd-B Phase"Philosophical Magazine A. 79. 2413-2436 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] D.L.Peng: "Characteristic Tunnel-Type Conductivity and Magnetoresistance in a CoO-coated Monodispersive Co Cluster Assembly"Applied Physics Letters. 74. 76-78 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] D.L.Peng: "Preparation and Magnetic Properties of Oxide-coated Monodispersive Co Cluster Assembly"Phyica Status Solidi (a). 172. 209-216 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.J.Konno: "Structure and Magnetic Properties of Co-sputtered Co-C Thin Films"Journal of Magnetism and Magnetic Materials. 195. 9-18 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] D.L.Peng: "Characteristic Transport Properties of CoO-Coated Monodispersive Co Cluster Assemblies"Physical Review B. 60. 2093-2100 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 今野豊彦: "磁性クラスター -原子の並び方から電磁場まで-"バウンダリー. 15・9. 2-6 (1999)

    • Related Report
      1999 Annual Research Report

URL: 

Published: 1999-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi