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.
出处
《磁性材料及器件》
CAS
CSCD
北大核心
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)
