Coexistence of Mn2+ and Mn3+ in ferromagnetic GaMnN

S. Sonoda, I. Tanaka, H. Ikeno, Tomoyuki Yamamoto, F. Oba, T. Araki, Y. Yamamoto, K. Suga, Y. Nanishi, Y. Akasaka, K. Kindo, H. Hori

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    Considerable efforts have been devoted recently to synthesizing diluted magnetic semiconductors having ferromagnetic properties at room temperature because of their technological impacts for spintronic devices. In 2001 successful growth of GaMnN films showing room temperature ferromagnetism and p-type conductivity was reported. The estimated Curie temperature was 940 K at 5.7% of Mn, which is the highest among diluted magnetic semiconductors ever reported. However, the electronic mechanism behind the ferromagnetic behaviour has still been controversial. Here we show experimental evidence using ferromagnetic samples that Mn atoms are substitutionally dissolved into the GaN lattice and they exhibit mixed valences of +2 (majority) and +3. The p-type carrier density decreases significantly at very low temperatures. At the same time, magnetization dramatically decreases. The results imply that the ferromagnetic coupling between Mn atoms is mediated by holes in the mid-gap Mn band.

    Original languageEnglish
    Pages (from-to)4615-4621
    Number of pages7
    JournalJournal of Physics Condensed Matter
    Volume18
    Issue number19
    DOIs
    Publication statusPublished - 2006 May 17

    Fingerprint

    room temperature
    ferromagnetism
    atoms
    Curie temperature
    Atoms
    Magnetoelectronics
    Ferromagnetism
    valence
    conductivity
    Temperature
    magnetization
    Carrier concentration
    Magnetization
    electronics
    Diluted magnetic semiconductors

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Sonoda, S., Tanaka, I., Ikeno, H., Yamamoto, T., Oba, F., Araki, T., ... Hori, H. (2006). Coexistence of Mn2+ and Mn3+ in ferromagnetic GaMnN. Journal of Physics Condensed Matter, 18(19), 4615-4621. https://doi.org/10.1088/0953-8984/18/19/015

    Coexistence of Mn2+ and Mn3+ in ferromagnetic GaMnN. / Sonoda, S.; Tanaka, I.; Ikeno, H.; Yamamoto, Tomoyuki; Oba, F.; Araki, T.; Yamamoto, Y.; Suga, K.; Nanishi, Y.; Akasaka, Y.; Kindo, K.; Hori, H.

    In: Journal of Physics Condensed Matter, Vol. 18, No. 19, 17.05.2006, p. 4615-4621.

    Research output: Contribution to journalArticle

    Sonoda, S, Tanaka, I, Ikeno, H, Yamamoto, T, Oba, F, Araki, T, Yamamoto, Y, Suga, K, Nanishi, Y, Akasaka, Y, Kindo, K & Hori, H 2006, 'Coexistence of Mn2+ and Mn3+ in ferromagnetic GaMnN', Journal of Physics Condensed Matter, vol. 18, no. 19, pp. 4615-4621. https://doi.org/10.1088/0953-8984/18/19/015
    Sonoda, S. ; Tanaka, I. ; Ikeno, H. ; Yamamoto, Tomoyuki ; Oba, F. ; Araki, T. ; Yamamoto, Y. ; Suga, K. ; Nanishi, Y. ; Akasaka, Y. ; Kindo, K. ; Hori, H. / Coexistence of Mn2+ and Mn3+ in ferromagnetic GaMnN. In: Journal of Physics Condensed Matter. 2006 ; Vol. 18, No. 19. pp. 4615-4621.
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    AU - Sonoda, S.

    AU - Tanaka, I.

    AU - Ikeno, H.

    AU - Yamamoto, Tomoyuki

    AU - Oba, F.

    AU - Araki, T.

    AU - Yamamoto, Y.

    AU - Suga, K.

    AU - Nanishi, Y.

    AU - Akasaka, Y.

    AU - Kindo, K.

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