Search Results - (Author, Cooperation:T. Fukumura)

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  1. 1
    Y. Yamada ; K. Ueno ; T. Fukumura ; H. T. Yuan ; H. Shimotani ; Y. Iwasa ; L. Gu ; S. Tsukimoto ; Y. Ikuhara ; M. Kawasaki
    American Association for the Advancement of Science (AAAS)
    Published 2011
    Staff View
    Publication Date:
    2011-05-28
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Imanishi, N. ; Fukumura, T. ; Miyamoto, S. ; Iwasaki, M.

    [S.l.] : American Institute of Physics (AIP)
    Published 1987
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Molecular effects of hydrogen trapping are examined for the implantation of H+2 and H+3 molecular ions into aluminum and aluminum oxide. It was found that the H+3 bombardment enhances trapping efficiencies more than H+2 by a factor of 2.7 for Al and 4.3 for Al2O3. These results indicate the importance of the interaction between hydrogen and vacancy clusters.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.338243

    Articles: DFG German National Licenses
  3. 3
    Fukumura, T. ; Jin, Zhengwu ; Ohtomo, A. ; Koinuma, H. ; Kawasaki, M.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Epitaxial thin films of an oxide-diluted magnetic semiconductor, Mn-doped ZnO, were fabricated by pulsed-laser deposition technique. Solubility of Mn into ZnO exceeds thermal equilibrium limit as a result of nonequilibrium film growth process. As Mn content is increased, the lattice constants of both a and c axes of wurtzite Zn1−xMnxO films (x〈0.35) increase and the band gap expands although considerable in-gap absorption develops. Itinerant electrons over 1019 cm−3 can be doped into the Zn1−xMnxO films by Al doping, in contrast to low carrier density in the other II–VI diluted magnetic semiconductors. The temperature dependence of the resistivity is almost metallic and considerable magnetoresistance is observed at low temperatures. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.125353

    Articles: DFG German National Licenses
  4. 4
    Fukumura, T. ; Jin, Zhengwu ; Kawasaki, M.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2001
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We report on the magnetic properties of an oxide-diluted magnetic semiconductor (DMS), Zn0.64Mn0.36O. The temperature dependence of the magnetization shows a spin-glass behavior with the large magnitude of the Curie–Weiss temperature, corresponding to a stronger antiferromagnetic exchange coupling than other II–VI DMSs. The small effective Mn moment (x¯∼0.02) under high field also represents a strong antiferromagnetic exchange coupling in this compound. © 2001 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1348323

    Articles: DFG German National Licenses
  5. 5
    Jin, Zhengwu ; Fukumura, T. ; Kawasaki, M.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2001
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Combinatorial laser molecular-beam epitaxy method was employed to fabricate epitaxial ZnO thin films doped with all the 3d transition metal (TM) ions in a high throughput fashion. The solubility behavior of TM ions was discussed from the viewpoints of the ionic radius and valence state. The magneto-optical responses coincident with absorption spectra were observed for Mn- and Co-doped samples. Cathodoluminescence spectra were studied for Cr-, Mn-, Fe-, and Co-doped samples, among which Cr-doped ZnO showed two sharp peaks at 2.97 eV and 3.71 eV, respectively, at the expense of the exciton emission peak of pure ZnO at 3.25 eV. Different magnetoresistance behavior was observed for the samples codoped with n-type carriers. Ferromagnetism was not observed for Cr- to Cu-doped samples down to 3 K. © 2001 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1377856

    Articles: DFG German National Licenses
  6. 6
    Fukumura, T. ; Hasegawa, T.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2001
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The anisotropic magnetic domain structure of a layered manganite La1.4Sr1.6Mn2O7 has been analyzed quantitatively. The evaluated dimensions of the domain indicate the low dimensionality and reproduce spontaneous formation of the bubble domain taking stability of the bubble domain into account. The ferromagnetic regions observed below the Neel temperature might be responsible for the limited tunneling magnetoresistance ratio reported in this compound. © 2001 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1359778

    Articles: DFG German National Licenses
  7. 7
    Fukumura, T. ; Ohtani, M. ; Kawasaki, M.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2000
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We propose a method of rapid construction of a structural–magnetic–electronic phase diagram of doped Mott insulators. The composition-spread method is utilized for fabricating a film whose doping concentration varies from 0 to 1 continuously. The concurrent x-ray diffractometer that measures x-ray diffraction spectra of all the composition simultaneously, the scanning superconducting quantum interference device microscope, and the infrared optical spectroscopy are employed for characterizing the film. A demonstration is given for a colossal magnetoresistive material, La1−xSrxMnO3. © 2000 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1326847

    Articles: DFG German National Licenses
  8. 8
    Maeda, M. ; Fukumura, T. ; Kojima, M.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0883-2889
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0883-2889(87)90046-3

    Articles: DFG German National Licenses
  9. 9
    Staff View
    ISSN:
    0883-2889
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0883-2889(91)90163-U

    Articles: DFG German National Licenses
  10. 10
    Soda, K. ; Hirasawa, T. ; Fukumura, T.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0003-2697
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0003-2697(78)90597-3

    Articles: DFG German National Licenses
  11. 11
    Yamada, H. ; Fukumura, T. ; Ito, Y. ; Imoto, T.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0003-2697
    Keywords:
    N-bromosuccinimide ; oxindolealanine
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0003-2697(85)90397-5

    Articles: DFG German National Licenses
  12. 12
    Staff View
    ISSN:
    0014-5793
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0014-5793(78)80240-3

    Articles: DFG German National Licenses
  13. 13
    Kitaoka, Y. ; Yamase, I. ; Fukumura, T. ; Kitao, T.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0021-9673
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/S0021-9673(00)93792-0

    Articles: DFG German National Licenses
  14. 14
    Maeda, M. ; Koga, Y. ; Fukumura, T. ; Kojima, M.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0883-2889
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0883-2889(90)90006-3

    Articles: DFG German National Licenses