Effects of heat treatment and magnetoannealing on nanocrystalline Co-ferrite powders

This work consists of three parts: the effects of heat treatment (slow cooling and quenching), magnetoannealing, and postannealing of samples with induced anisotropy. It has been found that noncomplete inverse spinel structure was the result after annealing at higher temperature and quenching. Our M...

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Bibliographic Details
Published in:Journal of applied physics 2005-12, Vol.98 (12)
Main Authors: Wang, Y. C., Ding, J., Yin, J. H., Liu, B. H., Yi, J. B., Yu, S.
Format: Article
Language:English
Subjects:
ANISOTROPY
ANNEALING
COBALT COMPOUNDS
COERCIVE FORCE
COOLING
CRYSTALS
EQUATIONS
FERRITES
IONIC CONDUCTIVITY
MAGNETIZATION
MATERIALS SCIENCE
MOESSBAUER EFFECT
NANOSTRUCTURES
POWDERS
QUENCHING
REACTION KINETICS
SPINELS
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Summary:This work consists of three parts: the effects of heat treatment (slow cooling and quenching), magnetoannealing, and postannealing of samples with induced anisotropy. It has been found that noncomplete inverse spinel structure was the result after annealing at higher temperature and quenching. Our Mössbauer spectroscopy study confirmed noncomplete inverse structure after quenching, while inverse spinel structure was formed after slow cooling. The kinetics of the formation of induced anisotropy during magnetoannealing has been investigated in this study. Reduction of crystalline magnetic anisotropy was observed, as coercivity decreased after magnetoannealing. The change of remanence ratio and coercivity followed the expected equations for ion diffusion. A relative large anisotropy in magnetization was evident. A postannealing resulted in the conversion into the initial isotropic stage. The process could be well described using the equations of ion diffusion.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2148632