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Fabrication and magnetic investigation of Y or Gd containing CoFe2O4 nanocrystalline films

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Yan, Chunhua;   Cheng, Fuxiang;   Peng, Zuoyan;   Xu, Zhigang;   Liao, Chunsheng;  
State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, 100871, China 

This paper appears in: Journal of Applied Physics
Issue Date: Nov 1998
Volume: 84 Issue:10
On page(s): 5703 - 5708
ISSN: 0021-8979
Digital Object Identifier: 10.1063/1.368834 
Date of Current Version: 18 六月 2009

Abstract

The exertion for carrying out the substitution of Fe3+ ion in CoFe2O4 spinel by Y3+ and Gd3+ ions has been put forth in the present article. Y or Gd containing CoFe2O4 nanocrystalline films with average particles size of 65 nm were synthesized by sol-gel method, and then the magnetic properties of the products were investigated at room temperature. To improve the crystallization of Gd-doped cobalt spinels, we buffered them on about a 20-nm-thick CoFe2O4 thin film. However, the analysis on the results for both x-ray diffraction and magnetic measurement showed that it is difficult to perform the doping of Y3+ ions inside cobalt spinel ferrite. The proper doping amount of magnetic Gd3+ ion can enlarge saturation magnetization (Ms) and coercive force (Hc) of resultant nanocrystalline films, whereas the doping of Y only reduces them. © 1998 American Institute of Physics.  

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