张应力作用下CoFeSiB非晶丝和薄带的巨磁阻抗效应  

Magnetoimpedance Effect in CoFeSiB Amorphous Wires and Ribbons Under Tensile Stresses

作　　者：武继文[1] 张义权[2] 

机构地区：[1]南京医科大学基础医学院,江苏南京210029 [2]南京师范大学物理科学与技术学院,江苏南京210097

出　　处：《磁性材料及器件》2010年第1期24-26,31,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学青年基金资助项目(10704041);江苏省高校自然科学基金资助项目(07KJB140054)

摘　　要：采用熔融抽拉法和单辊急冷法分别制备了Co68.25Fe4.5Si12.25B15非晶丝和薄带。研究了不同张应力作用下丝和薄带的GMI效应,结果发现随张应力的上升非晶丝的GMI比下降,而非晶薄带的GMI比则先升后降。当张应力为227MPa时,薄带的GMI比最大达到452%,△Z/Z=[Z(H)-Z(H=0)]/Z(H=0)也达到260%,磁场灵敏度达到3.2%/(A·m-1)。分析表明过强的环向(横向)各向异性反而不利于GMI效应。Co68.25Fe4.5Si12.25B15 amorphous wires and ribbons were produced by melt-extraction method and single roller melt spinning method, respectively. The relationship between GMI effect and tensile stress was investigated, and as a result, with the increase of tensile stress the GMI ratio of wires decreases while that of ribbons first increases and then decreases. When the tensile stress was equal to 227MPa, the maximal GMI ratio of ribbon reaches 452% and the ratio △Z/Z=[Z（H）-Z（H=0）]/Z（H=0） reaches 260%, the sensitivity of magnetic field achieves 3.2%/（A·m^-1）. Analysis showed that excessively strong anisotropy in circumferential or transverse direction was not conducive to GMI.

关 键 词：CoFeSiB非晶丝 CoFeSiB非晶薄带 张应力 巨磁阻抗 

分 类 号：TM274[一般工业技术—材料科学与工程] TG139.8[电气工程—电工理论与新技术]