Large magnetostrictive susceptibility in Tb-FeCo/FeCo multilayers

Duc, N. H.; Danh, T. M.; Tuan, N. A.; Teillet, J.
June 2001
Applied Physics Letters;6/4/2001, Vol. 78 Issue 23, p3648
Academic Journal
[Tb(Fe[sub 0.55]Co[sub 0.45])[sub 1.5]/Fe][sub n] and [Tb(Fe[sub 0.55]Co[sub 0.45])[sub 1.5]/(Fe[sub 0.5]Co[sub 0.5]][sub n] multilayers were fabricated by rf-magnetron sputtering from composite targets. Magnetostriction was measured using an optical deflectometer. The as-deposited films showed a soft magnetic and magnetostrictive character, with a coercive field μ[sub 0]H[sub c]=5 mT and a parallel magnetostrictive susceptibility χ[sub λ||]=dλ[sub ||]/d(μ[sub 0]H)=1.4x10[sup -2] T[sup -1]. This magnetostrictive softness was strongly improved by heat treatments: the magnetostrictive susceptibility attains the huge value of 5x10[sup -2] T[sup -1] in applied field of 6 mT. The low-field dependence of the magnetostrictive susceptibility and their technical characters are described in detail. © 2001 American Institute of Physics.


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