Abstract
In the dilute γ-Fe2O3–ZnFe2O4 binary ferrofluids, the magnetic interaction between γ-Fe2O3 nanoparticles is large enough to form aggregates. The magnetization behavior of the binary ferrofluids with ϕ γ =0.4 % and ϕ Zn=0.1 %, 0.2 %, or 0.4 % are investigated. The magnetism of ZnFe2O4 nanoparticles is very weak so the magnetization behavior of the binary ferrofluids results mainly from the γ-Fe2O3 nanoparticle system. Experimental results indicate that the initial susceptibility of the binary ferrofluids with ϕ Zn=0.4 % is the smallest, although that with ϕ Zn=0.2 % is larger than the one with ϕ Zn=0.1 %. In addition, at high field, the magnetization of the ferrofluid with ϕ Zn=0.4 % is greatest. These results show that both chain-like and ring-like aggregates of γ-Fe2O3 particles are stimulated by the ZnFe2O4 particle system. The contributions of the two types of aggregate in the magnetization process are different. The ratio of these aggregates varies nonmonotonically with ϕ Zn, so as ϕ Zn increases; the weak magnetic ZnFe2O4 particle system produces a nonmonotonic modification of the initial susceptibility of these binary ferrofluids.
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This work is supported by the Nature Science Foundation of China (11074205).
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Fu, J., Li, J., Lin, Y. et al. The modification of the initial susceptibility of dilute binary ferrofluids based on γ-Fe2O3/ZnFe2O4 nanoparticles. Appl. Phys. A 108, 155–160 (2012). https://doi.org/10.1007/s00339-012-6864-z
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DOI: https://doi.org/10.1007/s00339-012-6864-z