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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。这些结果对于建立或验证颗粒系统ＧＭＲ的理论模型具有重要参考意义
In this paper, the microstructure of Cu88Co12 alloy with quenching bandgap (GMR) was investigated by using field ion microscope-atomic probe (FIM-AP) and electron microscopy. Cu88Co12 alloy annealed at 450 ℃ for half an hour after that obvious giant magnetoresistance. For the first time, the nanosized spherical Co particles precipitated in this alloy were observed by FIM and the size distribution was obtained. The average diameter of intracrystalline Co particles in a sample with the maximum GMR effect is about 1.7 nm. Electron microscopy shows the larger Co particles precipitated on the grain boundaries. These results have important reference for establishing or verifying the theoretical model of GMR particle system