Static bubble domain properties of amorphous Gd–Co films

Abstract

Metallic Gd_1−xCo_x films (0.75 < × A gives estimates of the uniaxial anisotropy energy K_u. The results indicate that for the composition range studied A increases linearly from 5.7 to 6.6 (10⁻⁷ erg/cm), while K_u ranges between 1 and 7 (10⁵ erg/cm³). The saturation magnetization M_s varies between 30 and 180 G. The moderate anisotropy (Q=K_u/2πM_s² = 1–9) and low wall motion coercivity of less than 1 Oe are favorable to bubble device applications. The effect of thermal and magnetic annealing on the magnetic properties is also discussed.