期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 444, 期 -, 页码 378-382出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2017.08.045
关键词
Cobalt ferrite; Iron-cobalt alloy; Nanocomposites; Exchange-spring
资金
- CNPq (Brazilian Agency)
- CAPES (Brazilian Agency)
- FINEP (Brazilian Agency)
- FAPERN (Brazilian Agency)
Magnetic nanocompositesof CoFe2-CoFe2O4 were synthesized using the borohydride reduction process in a chitosan solution of FeCl2.4H(2)O and CoCl2.6H(2)O. The chemical crosslinking favored the formation of cobalt ferrite in the nanoparticle synthesis process. The phase structure, particle size, morphology and magnetization of the nanoparticles were investigated by X-ray diffraction (XRD), Mossbauer spectroscopy ( MS), scanning electron microscopy, and vibrating sample magnetoscopy, respectively. The XRD results showed that the samples are mostly made up of amorphous phases and MS shows that the phases are Fe-B. The average size of the nanoparticles obtained varied within a range of 4-13 nm. Different magnetic behavior such as ferromagnetism, spin glass and exchange-spring were observed in the nanocomposites depending on the quantify of CoFe2O4. (C) 2017 Elsevier B.V. All rights reserved.
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