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Magnetic properties of FeSiBCuNb wires during the first stages to the nanocrystallization process
Journal article   Peer reviewed

Magnetic properties of FeSiBCuNb wires during the first stages to the nanocrystallization process

M Vazquez, P Marin, Ayodele Olofinjana and H A Davies
Materials Science Forum, Vol.179-181, pp.521-526
1995
DOI: https://doi.org/10.4028/www.scientific.net/MSF.179-181.521
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https://doi.org/10.4028/www.scientific.net/MSF.179-181.521View
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Abstract

Materials Engineering
In the present work, the magnetic properties of FeSiBCuNb wires are reviewed for samples in their as-cast amorphous state as well as after different heat treatments at annealing temperatures up to the generation of a homogeneous ultrafine nanocrystalline structure. The parallel modification of structure and magnetic behaviour of these wires can be summarized as follows: a) structural relaxation within the amorphous state (annealing temperature up to around 400°) leads to the disappearance of square loop and reduction of coercivity, b) the magnetic hardening when annealing at around 460° is ascribed to the segregation of Cu-enriched clusters as well as of first nanocrystallite nuclea, and c) final magnetic softening related to that homogeneous nanocrystalline structure. Particular attention is paid to the hardening described in b) focussing on the role played by each element, specially Cu and Nb, as well as the one played by the degree of amorphicity of the sample in its as-cast state. That magnetic hardening is discussed as originated by the mentioned clusters and nuclea acting as pinning centers for the wall displacements.

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