FeCuNbSiB合金薄带电流应力退火感生磁各向异性的研究

An Investigation on Magnetic Anisotropy Induced in Fe-Based Ribbons during Current Stress Annealing

摘要: 应力感生磁各向异性机理是一项备受关注的重要基础科学问题，本文采用电流应力退火原位观测装置，监测FeCuNbSiB合金薄带在应力作用下电流退火过程中薄带的伸长量，由纵向驱动巨磁阻抗效应曲线得到薄带应力退火感生的磁各向异性场。分析比较应力电流退火感生磁各向异性场与退火电流及薄带伸长量之间的关系获知，在50 MPa外加应力作用下，退火电流密度J = 45 A/mm²为薄带蠕变的临界点，在退火电流小于蠕变点时，电流应力退火没有感生明显的磁各向异性场，在退火电流大于蠕变点时，电流应力退火感生的磁各向异性场迅速变大，且随退火电流密度的增加呈线性增大。

Abstract: The mechanism of stress induced magnetic anisotropy is an important basic science problem which has been investigated extensively; currently, disputes still exist in the understanding about the mechanism of stress induced magnetic anisotropy. This paper studies the dynamic process that Fe73.5Cu1Nb3Si13.5B9 alloy ribbon (Fe-based alloy ribbon) prepared with single roll faster quenching is under the effect of stress that current annealing (current stress annealing ) induced magnetic anisotropy. We design a device which can monitor in-situ the length variation of Fe- based alloy ribbon during current stress annealing process and give a tracking measurement. The magnetic anisotropy field is obtained by the longitudinal curve of giant magneto-impedance. Analyze stress induced magnetic anisotropy field and the relationship between the thin belt elongation and annealing current, we know, under the action of applied stress 50 MPa, the annealing current density J = 45 A/mm² is the critical point of ribbon creep. When the annealing current is less than the creep point, the anisotropy is not obvious; when greater than the point, the current stress annealing induced magnetic anisotropy field changes quickly, and the field increases linearly with the increase of the annealing current density.