Cu_(88)Co_(12)合金的巨磁电阻及其微结构的研究  

Study on Microstructure of Melt Spun Cu 88 Co 12 Alloy with Giant Magnetoresistance

作　　者：王文东[1] 朱逢吾[1] 翁军[1] 肖纪美[1] 赖武彦[2] 

机构地区：[1]北京科技大学材料物理系 [2]中国科学院物理研究所

出　　处：《电子显微学报》1997年第3期290-294,共5页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金

摘　　要：本文利用场离子显微镜－原子探针（ＦＩＭ－ＡＰ）及电镜研究了具有巨磁电阻效应（ＧＭＲ）的甩带Ｃｕ８８Ｃｏ１２合金的微结构。Ｃｕ８８Ｃｏ１２合金经４５０℃退火半小时后即有明显的巨磁电阻。用ＦＩＭ首次观察到该合金中析出的纳米尺度的球状Ｃｏ粒子并得到其尺寸分布。在最大ＧＭＲ效应的样品中晶内Ｃｏ粒子的平均直径约为１．７ｎｍ。电镜观察到了晶界上较大的Ｃｏ粒子析出。The microstructure of melt spun Cu 88 Co 12 alloy was studied utilizing transmisson electron microscope (TEM) and field ion microscope with atom probe (FIM AP).This alloy has obvious giant magnetoresistance(GMR)after annealed at 723K for 0 5h.By means of FIM AP,the spherical Co precipitates were clearly observed for the first time and exhibit size distribution in this alloy.The average diameter of particles is about 1 7nm in the specimen annealed at 723K for 2h,which has the highest GMR of 30 7% at 1 5K.The large Co precipitates were observed at grain boundaries by TEM.These results are very useful to test the present theory about relationship between GMR and microstructure.

关 键 词：巨磁电阻 场镜-原子探讨 退火 铜钴合金 微结构 

分 类 号：TG156.2[金属学及工艺—热处理] TG146.11[金属学及工艺—金属学]