Abstract We present comparative studies of magnetic properties and giant magnetoimpedance (GMI) effect of Fe and Co-rich microwires. As-prepared Co-rich microwires present much higher GMI ratio. The impact of the stress-annealing on magnetic softness and high frequency magnetoimpedance effect of Fe-rich microwires has been studied. The large improvement of the magnetoimpedance response in a wide frequency range by the stress-annealing is observed. We have achieved GMI ratio increase by an order of magnitude after stress-annealing of Fe-rich microwire. Observed stress-induced anisotropy and related changes of magnetic properties are discussed considering internal stresses relaxation and “back-stresses”.

中文翻译：

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通过应力退火优化富铁微丝的高频磁阻抗效应

摘要 我们介绍了富铁和钴微丝的磁性和巨磁阻抗 (GMI) 效应的比较研究。制备好的富钴微丝呈现出更高的 GMI 比率。研究了应力退火对富铁微丝的磁软度和高频磁阻抗效应的影响。观察到通过应力退火在宽频率范围内磁阻抗响应的显着改善。在对富铁微丝进行应力退火后，我们实现了 GMI 比率增加一个数量级。考虑到内应力松弛和“背应力”，讨论了观察到的应力引起的各向异性和相关的磁性变化。