Effect of stress annealing on magnetic properties and GMI effect of Co- and Fe-rich microwires

摘要

We report on comparison of magnetic properties and GMI effect of as-prepared, annealed and stress-annealed Fe-and Co-rich microwires. Generally after annealing hysteresis loop of Co-rich microwires becomes rectangular. Stress annealed Co-rich microwires exhibit lower coercivity as-compared with conventionally annealed samples. Additionally we observed increasing of GMI ratio after stress annealing and its decreasing after conventional annealing. In the case of Fe-rich microwires the hysteresis loops of stress annealed samples present linear shape with low coercivity. Considerable improvement of GMI effect in Fe-rich microwires after stress annealing is observed.