Room-Temperature Ferromagnetism in Co-Doped In2O3 Nanocrystals

Co-doped In2O3 nanocrystals showing room-temperature ferromagnetism have been successfully prepared by a simple sol-gel synthesis route. The sample displays it clear ferromagnetism behavior above 300 K. Phase and structure analyses reveal that the nanocrystals are crystallized with Co ions substituted for In ions in the In2O3 matrix, and no trace of secondary phases or clusters is detected. The experimental results are explained theoretically by first-principles calculations based on density functional theory, which indicate that the native ferromagnetic behavior of Co-doped In2O3 could be mainly ascribed to the strong d-d coupling of the magnetic ions.

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J.L. gratefully acknowledges financial support from the "One-Hundred Talent Plan" of the Chinese Academy of Sciences and National Science Fund for Distinguished Young Scholar (Grant No. 60925016). This work is supported by the National High Technology Research and Development Program of China under Contract No. 2009AA034101 and the Postdoctoral Foundation under Contract No. O9T1050000.

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J.L. gratefully acknowledges financial support from the "One-Hundred Talent Plan" of the Chinese Academy of Sciences and National Science Fund for Distinguished Young Scholar (Grant No. 60925016). This work is supported by the National High Technology Research and Development Program of China under Contract No. 2009AA034101 and the Postdoctoral Foundation under Contract No. O9T1050000.