利用熔旋快淬技术在铜辊速度为40 m/s的条件下制备了Fe88Zr7B4Co1薄带,分别经550、600、650、700、725、750℃退火处理30 min,形成纳米晶薄带.研究了退火温度、外磁场和驱动电流频率对巨磁阻抗效应的影响.发现存在一个最佳退火温度650℃.其bcc α-Fe相的晶粒尺寸为11.3 nm,在此温度下制备的Fe88 Zr7 B4 Co1纳米晶薄带具有最强的巨磁阻抗效应:在H=90 Oe下,频率约为1 MHz时Fe88Zr7B4Co1纳米晶薄带的磁阻抗△Z/Z0达到-52%.Fe88Zr7B4Co1纳米晶薄带具有比未掺杂的Fe88Zr7B4更强的巨磁阻抗效应.
Fe88 Zr7 B4 Co1 ribbons were prepared with melt-spining technique, followed by annealing at different tem-peratures from 550℃ to 750℃ for 30 rain, respectively. The influences of annealing temperature, external dc field and drive ac frequency on giant magnetoimpedance (GMI) were investigated. There is an optimal temperature (650 ℃) for obtaining strongest magnetoimpedance (AZ/Z0=-52% under H=90 Oe). The GMI effect is stronger for Fe88 Zr7 B4 Co1 than for Fe88 Zr7 B4.
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