The Tb(Fe_0.55Co_0.45)_1.5 films were fabricated by rf magnetron sputtering from a composite target. Samples were investigated by means of x-ray diffraction, vibrating sample magnetometer, conversion electron Mössbauer spectra, and magnetostriction measurements. The as-deposited film is an amorphous alloy with a perpendicular magnetic anisotropy and an intrinsic magnetostriction λ=1080×10^-6 in an applied field of 0.7 T. In this state, it was determined that the hyperfine field B_hf=23.5 T and the cone-angle between the Fe moment direction and the film-normal direction β=12°. After annealing in the temperature range of T_A=250-450&C the amorphous structure still remained, however the anisotropy was changed to a parallel one. The soft magnetostrictive behavior has also been improved by these heat treatments: the parallel magnetostriction λ_∥=465×10^-6 was almost developed in low applied fields of less than 0.1 T and, especially, a huge magnetostrictive susceptibility χ_λ=dλ_∥/d(μ ₀H)=1.8×10^-2T^-1 was obtained at μ₀H=15 mT. © 2000 American Institute of Physics.

Danh T.M., Duc N.H., Thanh H.N., Teillet J.

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