Peculiar Effect of Heat Treatment on the Stress-magnetization of Co-Based Amorphous Ribbons

摘要

The stress-magnetization properties of Co-based amorphous ribbons due to heat treatment were investigated. A sample was annealed with a longitudinal magnetic field applied to its ribbon axis. Examination of the stress-magnetization change revealed a stress-insensitive region that depended on the annealing temperature. To apply further stress, the magnetization of the sample was decreased to zero. However, examination of the magnetization change revealed a unique behavior due to a stress application at a lower exciting magnetic field (<5A/m). The stress-magnetization change showed irreversibility, with a maximum slightly larger than the initial magnetization value while the stress was decreased and then restored to the initial value. The results could be interpreted as implying a model of combined effects: a magnetic field parallel to the ribbon axis, an induced anisotropy field due to field annealing, and magnetoelastic anisotropy due to the applied tensile stress.