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Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

希薄磁性半導体鉄ドープ型酸化亜鉛ナノ粒子の電子構造と磁性

片岡 隆史*; 小林 正起*; 坂本 勇太*; Song, G. S.*; 藤森 淳*; Chang, F.-H.*; Lin, H.-J.*; Huang, D. J.*; Chen, C. T.*; 大河内 拓雄*; 竹田 幸治; 岡根 哲夫; 斎藤 祐児; 山上 浩志; 田中 新*; Mandal, S. K.*; Nath, T. K.*; Karmakar, D.*; Dasgupta, I.*

Kataoka, Takashi*; Kobayashi, Masaki*; Sakamoto, Yuta*; Song, G. S.*; Fujimori, Atsushi*; Chang, F.-H.*; Lin, H.-J.*; Huang, D. J.*; Chen, C. T.*; Okochi, Takuo*; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Yamagami, Hiroshi; Tanaka, Arata*; Mandal, S. K.*; Nath, T. K.*; Karmakar, D.*; Dasgupta, I.*

We have studied the electronic structure of Fe-doped ZnO nanoparticles, which have been reported to show ferromagnetism at room temperature, by X-ray photoemission spectroscopy (XPS), resonant photoemission spectroscopy (RPES), X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD). From the experimental and cluster-model calculation results, we find that Fe atoms are predominantly in the Fe$$^{3+}$$ ionic state with mixture of a small amount of Fe$$^{2+}$$ and that Fe$$^{3+}$$ ions are dominant in the surface region of the nanoparticles. It is shown that the room temperature ferromagnetism in the Fe-doped ZnO nanoparticles is primarily originated from the antiferromagnetic coupling between unequal amounts of Fe$$^{3+}$$ ions occupying two sets of nonequivalent positions in the region of the XMCD probing depth of $$sim$$2-3 nm.

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パーセンタイル:11.81

分野:Physics, Applied

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