| Author(s) |
Kataoka, T.; Kobayashi, M.; Song, G. S.; Sakamoto, Y.; Fujimori, A.; Chang, F. H.; Lin, H. J.; Huang, D. J.; Chen, C. T.; Mandal, S. K.; Nath, T. K.; Karmakar, D.; Dasgupta, I.
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We have studied the electronic structure of Zn0:9Fe0:1O nanoparticles, which have been reported to be ferromagnetic at room temperature, by using soft X-ray absorption (XAS) and magnetic circular dichroism (XMCD). The XAS results indicate that Fe ions are predominantly in the
Fe3+ state with mixture of a small amount of Fe2+. It is shown that the room temperature ferromagnetism in the
Zn0:9Fe0:1O nanoparticles is primarily originated from the antiferromagnetic coupling between unequal amounts of
Fe3+ ions occupying two sets of nonequivalent positions in the region of the XMCD probing depth of
~2 -3 nm.
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