Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/79193
Type: Artigo de periódico
Title: Structural details and time dependence of the initial susceptibility in iron-rich Fe-Si ribbons
Author: Turtelli, RS
de Morais, E
Wiesinger, G
Reichl, C
Duong, VH
Grossinger, R
Abstract: A systematic study of the temperature dependence of the initial susceptibility c(AC) versus T of Fe-6.5 wt%Si, Fe-7.5 wt%Si and Fe-11 wt%Si ribbons in the as-quenched state and after annealing at 1373 K for 1 h has been performed. In ribbons with a silicon concentration of 6.5 and 7.5 wt%, the presence of an anomaly in chi(AC) versus T and a thermal susceptibility hysteresis at high temperatures were observed. This susceptibility anomaly is attributed to the magnetic aftereffect phenomenon originating from the diffusion of pairs of silicon atoms. The occurrence of a magnetic aftereffect is associated with the existence of the B2 type of structure in the sample induced during the process of cooling from high temperature, its formation being sensitive to the cooling rate. The activation energy of the reversible process of the time dependence of the magnetic susceptibility depends on the cooling rate and its value is estimated using an Arrhenius-type law. X-ray diffraction and Fe-57 Mossbauer measurements were included within this study, in order to investigate the crystallographic structure. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
Subject: soft magnetic materials
alloys
magnetic aftereffect
susceptibility
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S0304-8853(99)00473-4
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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