Magnetostrictive element having optimized...

G - Physics – 08 – B

Patent

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G08B 13/24 (2006.01) H01L 41/20 (2006.01)

Patent

CA 2280148

A magnetostrictive element for use in an magnetomechanical marker has a resonant frequency characteristic that is at a minimum at a bias field level corresponding to the operation point of the magnetomechancial marker. The magnetostrictive element has a magnetomechanical coupling factor k in the range 0.28 to 0.4 at the operating point (26). The magnetostrictive element is formed by applying current-annealing to an iron-nickel-cobalt based amorphous metal ribbon, or by cross-field annealing an iron-nickel-cobalt alloy that includes a few percent chromium and/or niobium.

L'invention concerne un élément à magnétostriction destiné à être utilisé dans un marqueur magnétomécanique et présentant une caractéristique de fréquence de résonance qui se situe à une valeur minimale à un niveau de champ de polarisation correspondant au point de fonctionnement du marqueur magnétomécanique. Cet élément à magnétostriction présente un coefficient de couplage magnétomécanique k se situant dans la plage comprise entre 0,28 et 0,4 au point de fonctionnement (26). Cet élément à magnétostriction est formé par recuit d'une bande de métal amorphe à base de fer-nickel-cobalt, avec application de courant, ou par recuit d'un alliage fer-nickel-cobalt comprenant un faible pourcentage de chrome et/ou de niobium, par application de champs croisés.

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