Abstract
The investigation addresses the role of Al in devitrification stage of a series of (Co94Fe6)72.5Si12.5−xAlxB13Cr2 (X = 0, 2, 4, 6 at%) rapidly quenched microwires. The incorporation of Al displayed reduction in primary onset and activation energy (A.E) while it facilitated widening of span between primary and secondary crystallization onsets. The Giant Magneto-Impedance (GMI) behaviour was influenced by Al concentration as well as applied uniaxial stress. Optimal Al containing alloy (x ∼ 2 at%) displayed signature of asymmetric dual peak at the operating frequency of 1 MHz and its prospective application as a very low magnetic field sensor in pre-stressed condition. However, with increasing stress, the asymmetric character transformed to symmetric dual peak which is attributed to the transition of transverse anisotropy to circular anisotropy via helical anisotropy. High stress sensitivity has been attributed to either dominant transverse or circular anisotropy. The transition of stress induced anisotropies in the microwires has been portrayed schematically to elucidate the transitions.
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