Magnetic anisotropy of amorphous alloy ribbons in as-quenched state

The in-plane magnetic anisotropy K u in as-quenched state has been studied for amorphous Fe-based, FeNi-based and Co-based alloys. The change in anisotropy K u with stress relief annealing has been measured and the dependence of anisotropy K us on magnetization square M 2 s after annealing is linear. Results show that the anisotropy K u consists of two parts: one is K uσ that can be annealed out, which is related to the coupling between magnetostriction and internal stress; the other is K us that originates from the surface shape effect.