【摘要】 通过同步辐射X射线衍射技术,观测Fe_73.5Cu₁Nb₃Si_13.5B₉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1 818.7%,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。更多还原

【Abstract】 In this paper, the microstructure of Fe_73.5Cu₁Nb₃Si_13.5B₉ 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 HP4294 A 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 1 818.7%, 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.更多还原