Influence of Na doping on the magnetic relaxation processes of magnetite

The relaxation of the initial magnetic permeability was measured in polycrystalline Na-doped magnetite samples, with nominal composition Na x Fe 3− x O 4 ( x ranging from 0 to 0.05), by means of the magnetic disaccommodation (DA) technique. We found that the increasing amount of Na ions modifies the...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2007-03, Vol.310 (2), p.e873-e875
Main Authors: Torres, C., Arias, A. González, Hisatake, K., de Francisco, C., Hernández-Gómez, P., Kim, C.O., Kim, D.J.
Format: Article
Language:English
Subjects:
Disaccommodation
Magnetic aftereffect
Sodium-substituted magnetite
Spinel ferrites
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Summary:The relaxation of the initial magnetic permeability was measured in polycrystalline Na-doped magnetite samples, with nominal composition Na x Fe 3− x O 4 ( x ranging from 0 to 0.05), by means of the magnetic disaccommodation (DA) technique. We found that the increasing amount of Na ions modifies the DA spectra and a very different behaviour depending on the sintering atmosphere. These results were discussed in terms of the presence of Na ions in the magnetite lattice, giving rise to certain modifications in their neighbourhood.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2006.11.148