Sato Turtelli, R., Duong, G. V., Nunes, W., Grössinger, R., & Knobel, M. (2008). Magnetic properties of nanocrystalline CoFe₂O₄ synthesized by modified citrate-gel method. Journal of Magnetism and Magnetic Materials, 320(14), e339–e342. https://doi.org/10.1016/j.jmmm.2008.02.067
E138-03 - Forschungsbereich Functional and Magnetic Materials E138 - Institut für Festkörperphysik
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Journal:
Journal of Magnetism and Magnetic Materials
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ISSN:
0304-8853
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Date (published):
2008
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Number of Pages:
4
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Publisher:
ELSEVIER
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Peer reviewed:
Yes
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Keywords:
Condensed Matter Physics; Electronic, Optical and Magnetic Materials; Magnetization; Cobalt ferrite; Hysteresis loop; Citrate-gel method
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Abstract:
Nanocrystalline CoFe2O4 with an average grain size of about 40 nm was successfully prepared by a modified citrate-gel method. At temperatures of 3 and 300 K, the measured coercive fields are 0.43 and 0.07 T and the magnetizations at 7 T are 89 and 83 emu/g, respectively. At room temperature, the longitudinal and transversal magnetostriction values are −130 and 70 ppm, respectively. The contribution of a disordered magnetic phase was detected by the occurrence of a peak in the ac-susceptibilities curves at around 250 K. The temperature dependence of the field-cooled and zero field-cooled low-field magnetization showed a larger irreversibility below this temperature. This disordered phase behaves like a spin-glass, which is coexisting with the ferrimagnetically ordered main phase
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Research Areas:
Special and Engineering Materials: 80% Non-metallic Materials: 20%