| Author(s) |
Kataoka, T.; Yamazaki, Y.; Sakamoto, Y.; Fujimori, A.; Chang, F.H.; Lin, H.J.; Huang, D.J.; Chen, C.T.; Tanaka, A.; Mandal, S.K.; Nath, T.K.; Karmakar, D.; Dasgupta, I.
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We have performed x-ray absorption spectroscopy (XAS) measurements on
Zn1-2xMnxCoxO
nanoparticles. From the XAS results, it seems that the Mn and Co ions are in a mixed-valence (2+, 3+, and 4+) state and the relative concentrations of the high-valence (3+ and 4+) Mn and Co
ions are higher in the surface region than in the deep core region. We suggest that this is a distinct
trend of nanoparticle diluted magnetic semiconductor (DMS) unlike the case of DMS in film and
bulk forms, where the transition-metal ions are expected to be 2+.
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