低温应力退火Fe基合金薄带巨磁阻抗特性的研究

通过同步辐射X射线衍射技术,观测Fe73.5Cu1Nb3Si13.5B9非晶薄带经过不同温度和不同应力退火60 min后样品的微观结构,利用HP4294A型阻抗分析仪测量相应样品的巨磁阻抗比与磁各向异性。研究结果表明,在450℃下施加不同应力退火的样品仍然处于非晶结构状态,并且在应力为112.1 MPa的条件下产生优异的磁性能,样品的最大巨磁阻抗比达到了1818.7%,是自由退火条件下最大巨磁阻抗比的1.9倍,同时能够改变巨磁阻抗曲线的形状,使Fe基合金薄带的巨磁阻抗曲线具有宽线性的特性。对实验数据进行拟合后发现,样品的最大巨磁阻抗比和磁各向异性场与外加应力都具有线性关系,磁感灵敏度与外加应力具有负指数关系。通过探究发现具有非晶结构的Fe基合金薄带的磁学性能对应力敏感,可以作为研究非晶纳米晶合金材料应力敏感问题的另一个新方向。

Study on giant magneto-impedance characteristics of Fe-based alloy ribbons under low temperature stress annealing

In this paper,the microstructure of Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons annealed at different temperature and different stress for 60 min was observed by the synchrotron radiation technique.The giant magneto-impedance ratio and magnetic anisotropy of the corresponding samples were measured by HP4294A impedance analyzer.The results show that under the condition that the annealing temperature was lower than the glass-transition temperature of FeCuNbSiB,the samples were still amorphous which annealed under different stress,and the shape of giant magneto-impedance curve had changed and the wide linear property had appeared.When the stress was 112.1 MPa,the maximum giant magneto-impedance ratio of the sample reached 1818.7%,which was 1.9 times higher than that under free annealing.After fitting the experimental data,it was found that the maximum giant magneto-impedance ratio and magnetic anisotropy field of the sample were linearly related to the applied stress,and the magnetic inductance sensitivity had a negative exponential relationship with the applied stress.It was found that the magnetic properties of Fe-based alloy ribbons with amorphous structure were sensitive to stress,which could be used as another new direction to study the stress sensitivity of amorphous nanocrystal alloy materials.