[Tb(Fe_0.55Co_0.45)_1.5/Fe]_n and [Tb(Fe_0.55Co_0.45)_1.5/(Fe_0.5Co _0.5]_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 μ₀H_c=5 mT and a parallel magnetostrictive susceptibility χ_λ∥=dλ_par;/d(μ₀H) =1.4×10^-2 T^-1. This magnetostrictive softness was strongly improved by heat treatments: the magnetostrictive susceptibility attains the huge value of 5×10^-2 T^-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.

Duc N.H., Danh T.M., Tuan N.A., Teillet J.

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