The annealing of magnetic amorphous wires by passing a dc current through them leads to an improvement in their magnetic properties. A theoretical model is proposed for the calculation of the radial and temporal distribution of the temperature produced by passing a dc current through the wire by taking into account the linear temperature dependence of the electrical resistivity. The higher the value of the dc current, the faster the equilibrium temperature is reached. The temperature distribution is approximately constant in the cross-section of the wire. The calculated temperature values are experimentally verified through magnetic measurements using a fluxmeter on amorphous wires with known Curie temperature. It is ascertained that the theoretical results are in good agreement with the experimental ones.
Le recuit des fils magnetiques amorphes par le passage d'un courant electrique continu conduit a l'amelioration de leurs proprietes magnetiques. On a propose un modele de calcul de la distribution radiale et temporelle de la temperature produite par un courant electrique passant dans le fil en tenant compte de la variation de la resistivite electrique avec la temperature. La temperature du fil atteint une valeur d'equilibre d'autant plus vite que la valeur du courant applique est plus grand. La distribution de la temperature dans la section du fil est a peu pres constante. Les valeurs calculees de la temperature ont ete verifiees experimentalement par des mesures magnetiques en utilisant une methode inductive en connaissant les temperatures Curie des fils magnetiques. On a trouve une bonne correspondance avec les donnees experimentales.
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