Co_xAg_(100-x)颗粒膜的巨磁电阻效应及其物理机制研究

STUDY ON THE GMR EFFECT OF Co_xAg_(100-x) GRANULAR FILMS AND ITS PHYSICAL MECHANISM

用超高真空电子束蒸发沉积方法制备了ＣｏｘＡｇ１００－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。

o_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 Co_39Ag_61 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 N_2 The magnetoresistance of a granular film could be described in a fourth order polynomial even function of its magnetization