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Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles.
- Source :
- Journal of Applied Physics; Feb2010, Vol. 107 Issue 3, p033718-033718-7, 7p, 1 Chart, 8 Graphs
- Publication Year :
- 2010
-
Abstract
- 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, resonant photoemission spectroscopy, x-ray absorption spectroscopy, 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<superscript>3+</superscript> ionic state with mixture of a small amount of Fe<superscript>2+</superscript> and that Fe<superscript>3+</superscript> ions are dominant in the surface region of the nanoparticles. It is shown that the room temperature ferromagnetism in the Fe-doped ZnO nanoparticles primarily originated from the antiferromagnetic coupling between unequal amounts of Fe<superscript>3+</superscript> ions occupying two sets of nonequivalent positions in the region of the XMCD probing depth of ∼2–3 nm. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 107
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 48068079
- Full Text :
- https://doi.org/10.1063/1.3294620