Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 22, Pages 3642-3647Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2010.07.014
Keywords
ZnO; Ferromagnetism; Defect; Positron annihilation
Funding
- National Natural Science Foundation of China [10875088, 60777019]
- 973 program [2008CB617607]
Ask authors/readers for more resources
High purity Fe2O3/ZnO nanocomposites were annealed in air at different temperatures between 100 and 1200 degrees C to get Fe-doped ZnO nanocrystals. The structure and grain size of the Fe2O3/ZnO nanocomposites were investigated by X-ray diffraction 2 theta scans. Annealing induces an increase of the grain size from 25 to 195 nm and appearance of franklinite phase of ZnFe2O4. Positron annihilation measurements reveal large number of vacancy defects in the interface region of the Fe2O3/ZnO nanocomposites, and they are gradually recovered with increasing annealing temperature. After annealing at temperatures higher than 1000 degrees C, the number of vacancies decreases to the lower detection limit of positrons. Room temperature ferromagnetism can be observed in Fe-doped ZnO nanocrystals using physical properties measurement system. The ferromagnetism remains after annealing up to 1000 degrees C, suggesting that it is not related with the interfacial defects. (C) 2010 ElsevierB. V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available