Abstract
Abstract 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. For interpretation of observed changes of hysteresis loops after stress annealing we considered internal stresses relaxation and different mechanisms of stress-induced anisotropy. Observed versatile properties of stress annealed glass-coated microwires with enhanced and tunable soft magnetic properties make them suitable for technological sensing applications.
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