Surface anisotropy change of CoFeO nanoparticles depending on thickness of coated SiO shell
Journal of Nanoparticle Research, ISSN: 1572-896X, Vol: 14, Issue: 10
2012
- 27Citations
- 35Captures
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Article Description
We systematically investigated the effective surface anisotropy of CoFeO nanoparticles dependant on the thickness of SiO shell. XRD (X-ray powder diffraction) patterns and TEM (transmission electron microscopy) micrographs were used to investigate the structure of particles and thickness of SiO shell, respectively. The thicknesses of SiO shell with 5.41 nm on CoFeO nanoparticles were increased up to 14.04 ± 0.05 nm by changing the amount of added TEOS by, 0.10, 0.25, 0.50, 1.00, 1.50, and 2.50 mL. The increase of the SiO2 thickness shell decreased the effective anisotropy due to decline the effectiveness of the dipolar magnetostatic interactions, determined from Vogel-Fulcher equation, between the particles. The declines in the Keff values stabled at around 3.76 ± 0.11 9 10 J/m for TEOS amount higher than 1.5 mL. © Springer Science+Business Media Dordrecht 2012.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84866487304&origin=inward; http://dx.doi.org/10.1007/s11051-012-1197-6; http://link.springer.com/10.1007/s11051-012-1197-6; http://link.springer.com/content/pdf/10.1007/s11051-012-1197-6; http://link.springer.com/content/pdf/10.1007/s11051-012-1197-6.pdf; http://link.springer.com/article/10.1007/s11051-012-1197-6/fulltext.html; http://www.springerlink.com/index/10.1007/s11051-012-1197-6; http://www.springerlink.com/index/pdf/10.1007/s11051-012-1197-6
Springer Science and Business Media LLC
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