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The structural and magnetic properties of CoAl x Fe2−x O4/SiO2 nanocomposite films by sol–gel spin-coating method

  • Ji Li
  • Shanshan Li
  • Li Wang
  • Shichong Xu
  • Mei Liu
  • Haibo Li
Article
  • 82 Downloads

Abstract

CoAl x Fe2−x O4/SiO2 (0 ≤ x ≤ 1.0) nanocomposite films were synthesized on Si (100) substrates by sol–gel spin-coating method. The effects of Al3+ content and annealing temperature on the structure and magnetic properties of the samples were investigated by X-ray diffraction, atomic force microscopy, field emission scanning electron microscopy, and vibrating sample magnetometer. The results showed CoAl x Fe2−x O4 in the films could be crystallized with a single phase spinel structure after being annealed. When the Al3+ contents x increased from 0 to 1.0, the lattice constants of CoAl x Fe2−x O4 nanoparticles in the films decreased from 0.8370 to 0.8251 nm, the average crystallite sizes decreased from 37 to 25 nm, and the in-plane and out-of-plane coercivity of the films decreased from 258 and 315 kA/m to 46 and 63 kA/m, respectively. As the annealing temperatures rose from 800 to 1150 °C, the lattice constants of CoAl0.2Fe1.8O4 nanoparticles in the films decreased from 0.8369 to 0.8352 nm, while the average crystallite sizes increased from 7 to 63 nm. And the CoAl0.2Fe1.8O4 nanoparticles in the films had obvious (111) preferred orientation at annealing temperature of 1150 °C. The in-plane and out-of-plane coercivity of CoAl0.2Fe1.8O4/SiO2 nanocomposite film annealed at 1100 °C showed the maximum values of 198 and 259 kA/m, respectively. The critical sizes of single-domain and superparamagnetism for CoAl0.2Fe1.8O4 nanoparticles in the films at room temperature were also estimated.

Keywords

Ferrite CoFe2O4 Average Crystallite Size Nanocomposite Film Spinel Ferrite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 21371071 and 11504132).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Ji Li
    • 1
  • Shanshan Li
    • 1
  • Li Wang
    • 1
  • Shichong Xu
    • 1
  • Mei Liu
    • 1
  • Haibo Li
    • 1
  1. 1.Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of EducationJilin Normal UniversitySipingChina

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