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Temperature dependence of the soft magnetic character of Fe73.5Cu1Nb3Si13.5B9 amorphous and nanocrystalline alloys

Published online by Cambridge University Press:  31 January 2011

J. Gonzáz
J. Gonzáz
Affiliation:
Department of Materials Physics, Faculty of Chemistry, P.O. Box 1072, 20080 San Sebastian, Spain
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Abstract

Results on microstructure and coercivity of current-annealed Fe73.5Cu1Nb3Si13.5B9 amorphous alloy treated at different current densities (12–56 A/mm2) and duration (0.5–720 min) are presented. Saturation magnetization and coercivity dependencies with the current density of the nanocrystalline samples is explained by considering the presence of two phases: nanocrystals of Fe(Si) body-centered cubic (bcc) grains and the residual amorphous matrix. An increase in the magnetic hardness observed when the sample was heated by current densities, giving rise to an increase in the sample temperature above the Curie point of the residual amorphous matrix, could be ascribed to exchange and dipolar decoupling of the Fe(Si)-bcc grains.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 18 , Issue 5 , May 2003 , pp. 1035 - 1038
Copyright
Copyright © Materials Research Society 2003

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