Iron-rich magnetostrictive element having optimized...

G - Physics – 08 – B

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G08B 13/24 (2006.01) C21D 1/04 (2006.01) C22C 38/14 (2006.01) H01F 1/04 (2006.01) H01F 1/153 (2006.01) H01L 41/20 (2006.01)

Patent

CA 2345814

A magnetostrictive element for use in a magneto-mechanical marker has a resonant frequency characteristic that is at a minimum at a bias field level corresponding to the operating point of the magnetomechanical marker. The magnetostrictive element has a magnetomechanical coupling factor k in the range 0.28 to 0.4 at the operating point. The magnetostrictive element is formed by applying cross-field annealing to an iron-rich (Fe) amorphous metal alloy (100) ribbon (45 to 82 percent iron) which includes a total of from 2 to 17 percent of one or more of Mn, Mo, Nb, Cr, Hf, Zr, Ta, V. Cobalt (Co), nickel (Ni), boron, silicon and/or carbon may also be included. The metal alloy (100) may include one early transition element selected from the group consisting of Zr, Hf and Ta, and also a second early transition element selected from the group consisting of Mn, Mo, Nb, Cr, and V.

Elément magnétostrictif destiné à être utilisé dans un marqueur magnétomécanique possédant une caractéristique de fréquence de résonance minimum au niveau du champ de polarisation correspondant au point de fonctionnement du marqueur magnétomécanique. L'élément magnétostrictif possède un coefficient de couplage magnétomécanique k compris dans l'intervalle de 0,28 à 0,4 au point de fonctionnement. L'élément magnétostrictif est formé par recuit, par application de champs croisés, d'une bande en alliage métallique amorphe riche en fer (45 à 82 % de fer) qui comprend au total entre 2 et 17 % d'au moins un des éléments suivants : Mn, Mo, Nb, Cr, Hf, Zr, Ta, V. Le cobalt, le nickel, le bore, le silicium et/ou le carbone peuvent aussi être inclus. L'alliage métallique peut contenir un des éléments de transition précoce sélectionné parmi le Zr, le Hf et le Ta, mais également un deuxième élément de transition précoce sélectionné dans le groupe des éléments suivants : Mn, Mo, Nb, Cr et V.

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