相位相干与巨磁电阻极大值

PHASE COHERENCE AND MAXIMUM GIANT MAGNETORESISTANCE

用双流模型研究磁性金属一金属型颗粒膜（Ｆｅ－Ａｇ，Ｃｏ－Ａｇ）中巨磁电阻（ＧＭＲ）极大值特性结果表明，磁性颗粒内杂质原子之间的相位相干，对磁电阻极大值的产生有重要影响这种相位相干与外场磁化的综合作用使颗粒膜巨磁电阻的尺寸关系表现出非单调的特征，井用该模型计算和讨论了巨磁电阻的其它性质。

The maximums of giant magnetoresistance (GMR) in magnetic granular alloys (FeAg, Co-Cu etc) have been investigated by a two-current quantum model. The results show that the phase coherence among the impurity atoms within magnetic particle plays a key role for the origin of maximum GMR. The competition between the phase coherence and magnetization causes the non- monotonic behavior. With our calculation, the field dependence of GMR is in agreement well with the experiments reported for the ferromagnetic granular films.