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On the intergranular coupling in soft nanocrystalline materials

Published online by Cambridge University Press:  31 January 2011

J. M. González ,
N. Murillo ,
J. González ,
J. M. Blanco  and
J. Echeberría
J. M. González
Affiliation:
Departamento de Propiedades Ópticas, Magnéticas y de Transporte, Instituto de Ciencia de Materiales, CSIC, Serrano 144, 28006 Madrid, Spain
N. Murillo
Affiliation:
Departamento de Física de Materiales, Facultad de Químicas, 20080 San Sebastián, Spain
J. González
Affiliation:
Departamento de Física de Materiales, Facultad de Químicas, 20080 San Sebastián, Spain
J. M. Blanco
Affiliation:
Departamento de Física Aplicada I, Escuela Universitaria de Ingeniería Técnica Industrial, 20010 San Sebastián, Spain
J. Echeberría
Affiliation:
Departamento de Materiales, CEIT, San Sebastián, Spain
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Abstract

The magnetic softness of nanocrystalline materials prepared from amorphous precursors is attributed to the average of the local magnetocrystalline anisotropy of the individual crystallites. In the present paper we have studied the effective magnetic anisotropy of Fe-based nanocrystalline samples with different microstructures. These microstructures were produced by using different heating rates when crystallizing the precursor material by means of continuous heating treatments. From the results of our study of the magnetic properties of the samples, carried out from the measurement of the bias field dependence of the transverse susceptibility, it was possible to discern the occurrence of intergranular coupling and to evaluate the typical dimensions of the coupled units. Since these dimensions were larger than the characteristic length of the microstructure, we suggest that the enhancement of the soft properties is linked to the decrease of the microstructure-magnetization interactions originating in large units of coupled magnetic moments.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 2 , February 1996 , pp. 512 - 517
Copyright
Copyright © Materials Research Society 1996

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References

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