Co<sub>x</sub>Ag<sub>100-x</sub>颗粒膜的巨磁电阻效应及其物理机制研究

Co_xAg_100-x颗粒膜的巨磁电阻效应及其物理机制研究

摘要: 用超高真空电子束蒸发沉积方法制备了Co_xAg_100-x颗粒并研究了其中的巨磁电阻（GMR）效应。实验结果表明：15kOe外磁场下，玻璃衬底上制备态Co₃₉Ag₆₁颗粒膜室温GMR效应值高达20.2%，并随氮气中退火温度上升而单调减小；颗粒膜的电阻与其磁化强度直接相关，可用四次多项式偶函数来描述。

Abstract: Co_xAg_100-x granular films were grown on the substrates of glass and silicon using the UHV electron beam evaporation system. It was found that at room temperature the giant magnetoresistance (GMR) value of the as-deposited Co₃₉Ag₆₁. granular film on the glass substrate was as large as 20.2% under an applied magnetic field of 15 kOe and GMR value decreased monotonously with increasing annealing temperature in N₂. The magnetoresistance of a granular film could be described in a fourth order polynomial even function of its magnetization.