本文研究了焦耳处理工艺的处理电流密度对Co68.15Fe4.35Si12.5B15和Co71.8Fe4.9Nb0.8Si7.5B15非晶薄带巨磁阻抗效应的影响.样品在不同电流密度下进行了处理.实验结果表明:焦耳处理存在最佳电流密度,对Co68.15Fe4.35Si12.5B15窄带来说,最佳处理电流密度为30A/mm2,处理后样品的阻抗变化率峰值和灵敏度分别为119%和73%/Oe;对C071.8Fe4.9Nb0.8Si7.5B15窄带来说,最佳处理电流密度为35A/mm2,处理后的阻抗变化率峰值为232%,灵敏度在30A/mm2时达到42%/Oe.处理后样品的内应力得到有效释放,软磁性能提高,使薄带的巨磁阻抗效应较淬态时有了明显提高.处理电流密度是焦耳处理方法中影响钴基非晶薄带巨磁阻抗效应的一个重要参数.
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