Artículos de revistas
Structural details and time dependence of the initial susceptibility in iron-rich Fe-Si ribbons
Registro en:
Journal Of Magnetism And Magnetic Materials. Elsevier Science Bv, v. 205, n. 41700, n. 290, n. 300, 1999.
0304-8853
WOS:000082977400021
10.1016/S0304-8853(99)00473-4
Autor
Turtelli, RS
de Morais, E
Wiesinger, G
Reichl, C
Duong, VH
Grossinger, R
Institución
Resumen
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. 205 41700 290 300