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On the fluctuation field in multidomain barium hexaferrite particles

Published online by Cambridge University Press:  31 January 2011

J. M. González ,
Anit K. Giri ,
C. de Julián ,
M. Vélez  and
J. L. Vicent
J. M. González
Affiliation:
Departamen to de Propiedades Ópticas, Magnéticas y de Transporte, Instituto de Ciencia de Materiales-CSIC. c/Serrano 144, 28006 Madrid, Spain
Anit K. Giri
Affiliation:
Departamen to de Propiedades Ópticas, Magnéticas y de Transporte, Instituto de Ciencia de Materiales-CSIC. c/Serrano 144, 28006 Madrid, Spain
C. de Julián
Affiliation:
Departamen to de Propiedades Ópticas, Magnéticas y de Transporte, Instituto de Ciencia de Materiales-CSIC. c/Serrano 144, 28006 Madrid, Spain
M. Vélez
Affiliation:
Departamento de Física de Materiales, Facultad de Ciencias F’sicas, Universidad Complutense, Avenida Complutense s/n, 28040 Madrid, Spain
J. L. Vicent
Affiliation:
Departamento de Física de Materiales, Facultad de Ciencias F’sicas, Universidad Complutense, Avenida Complutense s/n, 28040 Madrid, Spain
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Abstract

A complete study of the thermally activated demagnetization phenomenology taking place in multidomain barium hexaferrite sample is presented. From the irreversible magnetization dependence of the fluctuation field, it is concluded that a demagnetization mechanism independent of the magnetization value rules the reversal in samples having large enough particles. Differently from this, in a sample having a broad particle diameter distribution (and including a minority percentage of small, single domain particles), our results clearly indicate the occurrence of two different demagnetization processes. Also, it was observed that the activation volume, in all the samples, was of the same order of magnitude and clearly smaller than the particle volume.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 10 , October 1997 , pp. 2643 - 2647
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

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