退火、稀土Pr对Prx(Co40Ag60)100-x颗粒膜的结构与巨磁电阻效应的影响

Influences of Annealing Temperature and Pr Content on the Structure and Giant Magnetoresistance of Prx(Co40Ag60)100-x Granular Films

摘要:

采用磁控溅射法制备Prx(Co40Ag60)100-x颗粒膜。X射线衍射实验结果表明：稀土元素Pr有促进薄膜中溶于Ag中的Co发生相分离的作用，并且在退火过程Ag颗粒的聚集生长具有(111)轴择优取向的颗粒膜；巨磁电阻(GMR)效应测量结果表明：当退火温度小于或等于250 ℃时，随着Pr含量的增加，薄膜的GMR值先升后降，其峰值出现在x=0.5~1.0处。适量的Pr元素能够增强GMR效应以及提高GMR效应对磁场的灵敏度，GMR效应以及灵敏度的最大值分别为：–14.34%和0.67×10-3 (A/m)-1。

Abstract:

Prx(Co40Ag60)100-x (x=0, 0.5, 1, 1.5, 2, 3) granular films were prepared by a DC magnetron sputtering method. The XRD data indicate that Pr element can promote Co dissolving in Ag to separate from Ag and favors the (111) plane preferential orientation. Giant magnetoresistance (GMR) measurements indicate that the value of GMR increases at first and then decreases with increase of Pr content and the peak value appears at x=0.5-1.0 when the annealing temperature is below or equal to 250 oC. Proper addition of Pr to CoAg granular films can enhance GMR effect and the sensitivity to the magnetic field, whose maximum values are –14.34% and 0.67×10-3 (A/m)-1, respectively.