Study of CoFe2O4/CoFe2 nanostructured powder

We report an experimental study of the CoFe2O4/CoFe2 nanocomposite, a nanostructured material formed by hard (CoFe2O4) and soft (CoFe2) magnetic materials. The precursor material, cobalt ferrite (CoFe2O4), was prepared using the conventional stoichiometric gel-combustion method. The nanocomposite ma...

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Bibliographic Details
Published in:arXiv.org 2019-07
Main Authors: Ferreira, E S, Chagas, E F, Albuquerque, A P, Prado, R J, Baggio-Saitovitch, E
Format: Article
Language:English
Subjects:
Activated carbon
Argon
Charcoal
Cobalt ferrites
Coercivity
Hysteresis loops
Magnetic materials
Magnetic properties
Mechanical alloying
Nanocomposites
Nanostructured materials
Precursors
Reducing agents
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Summary:We report an experimental study of the CoFe2O4/CoFe2 nanocomposite, a nanostructured material formed by hard (CoFe2O4) and soft (CoFe2) magnetic materials. The precursor material, cobalt ferrite (CoFe2O4), was prepared using the conventional stoichiometric gel-combustion method. The nanocomposite material was obtained by reducing partially the precursor material using activated charcoal as reducing agent in air and argon atmospheres, at 800 and 900 C respectively. The magnetic hysteresis loops demonstrate that, in general, prepared nanocomposite samples display single magnetic behavior, indicating exchange coupling between the soft and hard magnetic phases. However, for nanocomposite samples prepared at higher temperatures, the hysteresis measurements show steps typical of two-phase magnetic behavior, suggesting the existence of two non-coupled magnetic phases. The studied nanocomposites presented coercivity (HC) of about 0.7 kOe, which is considerably lower than the expected value for cobalt ferrite. A huge increase in HC (>440%) and maximum energy product (about 240%) was obtained for the nanocomposite after high energy milling processing.
ISSN:2331-8422