软磁纳米晶丝的巨应力阻抗和巨扭矩阻抗效应

Giant Stress-impedance and Torsion-impedance Effects in Soft Magnetic Nanocrystalline Wire

在频率f=1MHz和纵向直流磁场H=0～±11.2kA/m下,分别测量了Fe73.5Cu1Nb3Si13.5B9纳米晶丝(由非晶退火而得)在外加应力(σ=0～157MPa)及扭矩(ξ=0～62.8rad/m)作用下的磁阻抗效应分别为-35%和-66%。基于感生磁弹性各向异性的概念,对应力阻抗效应和扭矩阻抗效应进行了理论分析。与实验结果的对比表明,阻抗随应力和扭矩的改变可由感生各向异性模型来解释。

The measurements of magnetoimpedance effect have been performed on the Fe73.5Cu1Nb3Si13.5B9 nanocrystalline wire under the application of tensile stress and torsion,at the frequency f = 1 MHz.The giant stress-impedance and torsion-impedance effects are as high as-35% and-66%,respectively.On the basis of induced magneto-elastic anisotropy,compared with the experiments,the stress-impedance and torsion-impedance effects can be explained by the induced anisotropy model.