中文摘要：

采用磁控溅射法制备Dyx（Co21CU79）100-x（x=0，4，8，9，12，14）颗粒膜。XRD结果表明：添加稀土元素Dy将促进CoCu过饱和固溶体分解，此外Dy元素还具有细化晶粒的作用。磁电阻测试发现：随着Dy含量的增加，Dyx（Co21CU79）100-x薄膜的电阻逐渐增大，而薄膜的巨磁电阻（GMR）值先升后降，当退火温度Ta=425℃时，Dy4（C021Cu79）96薄膜的GMR值达到最大，为-4．68％。薄膜的磁滞回线表明：矫顽力风随退火温度的升高逐渐增大，随Dy含量的增加，却单调减小。

英文摘要：

Dyx（Co21Cu79）100-x （x=0, 4, 8, 9,12,14） granular films were prepared by a DC magnetron sputtering method. The XRD data indicate that Dy element can promote Co dissolving in Cu to separate from Cu. In addition, Dy element also plays the role of a grain refiner. The giant magnetoresistance （GMR） measurements indicate that the resistance of Dyx （Co21Cu79）100-x films increases while GMR values of films increase at first and then decrease with the increasing Dy content. The maximum GMR value of -4.68% is obtained for Dy4（Co21Cu79）96 thin film after annealing at 425 ℃ for 30 rain. Hysteresis loops of the granular films indicate the value of coercivity （He） increases with higher annealing temperature but decreases with more Dy content.