Magnetization studies in amorphous Co80-x Gdx B20

Abstract

We have studied amorphous Co_80-x Gd_x B₂₀ alloys prepared by melt spinning technique. The Gd moment at 4.2 K is found to be 7 µ_B which agrees with the theoretical value indicating a collinear spin structure. The magnetic compensation at 4.2 K occurs for x close to 10.3. The mean-field theory has been used to explain the temperature dependence of the magnetization. The exchange interactions between Co-Co and Co-Gd atom pairs have also been evaluated.