电流应力退火感生磁各向异性焦耳热回火特性

Current Annealing Induced Magnetic Anisotropy Joule Heat Tempering Features

摘要: 本文采用跟踪观测Fe基合金薄带焦耳热应力退火及多次回火过程中样品应变，并测量经退火和各次回火样品的磁各向异性场的方法研究焦耳热应力感生磁各向异性在多次回火过程的变化行为。利用Gaosuo视频录像原位监测Fe基合金薄带在焦耳热应力退火及多次回火过程的宏观伸长量，由HP4294阻抗仪分别测量经焦耳热应力退火和不同次数回火样品的纵向驱动巨磁阻抗曲线，并由巨磁阻抗曲线计算各样品的磁各向异性场。研究结果表明，焦耳热应力退火产生显著的磁各向异性，而感生的磁各向异性采用多次回火只能减小不能被完全消除。这项研究结果表明，非晶软磁器件生产过程中采用退火方法消除应力对器件性能影响的做法存在严重缺陷，因为存在应力作用的退火过程会感生不可消除的感生磁各向异性。欲提高非晶软磁器件的性能，需要开发在生产过程中不引入或少引入纵向应力作用的新工艺。

Abstract: In this article, the strain behavior of Fe based ribbons which have been subjected to joule-heat stress annealing and multiple tempering is observed. The magnetic anisotropy field of the sample which has been annealed and tempered multiple times and the change in behavior of the joule- heat stress induced magnetic anisotropy during the tempering process is also studied. Using Gaosuo video in-situ monitoring system, the macro-elongation of the Fe based ribbon samples subjected to joule-heat stress annealing and multiple tempering is observed. The magnetic impedance of the samples was measured using an HP4294 impedance instrument and the magnetic anisotropy field was calculated from the giant magnetic impedance curve. The results showed that the joule-heat stress annealing affects significantly magnetic anisotropy, and the induced magnetic anisotropy using the same conditions reduces, but cannot be totally eliminated even after multiple tempering. The results also indicate that induced stress in amorphous soft magnetic devices produced by the joule-heat stress annealing method affects the performance of these devices. Therefore, to improve the performance of amorphous soft magnetic devices, new methods of production which does not induce longitudinal stresses need to be developed.