Magnetostriction (λ = λ - λ and other magnetic properties have been investigated for sputtered Tb x Fe 1 0 0 - x (5 x 60) and (Tb 1 - y Dy y ) 4 2 Fe 5 8 (0 y 1) alloy systems. These films exhibited an amorphous structure except for x < 7 and 50 < x < 60. In the binary alloy system, the magnetostriction measured at 7 kOe exhibited a maximum of about 450 10 - 6 at x = 33, corresponding to the composition of TbFe 2 Laves phase, while that at 1 kOe exhibited a maximum of about 220 10 - 6 at x = 42. In the pseudo-binary alloy system, the dependence of λ on the substitution of Dy was very similar to that of bulk data, implying a similarity of atomic short-range ordering between amorphous and crystalline (Tb-Dy)-Fe samples. The substrate temperature during the sputtering much influences upon the λ measured below 7 kOe. The maximum magnetostriction for both Tb 3 3 Fe 6 7 and (Tb 0 . 3 Dy 0 . 7 ) 3 3 Fe 6 7 films were obtained at the substrate temperatures of about 400 and 300°C, respectively. A remarkable aging effect was found for the pseudo-binary alloy films and not for the binary alloy films.