平行与垂直磁化下多层磁膜巨磁电阻与外磁场关系的唯象理论计算

THEORETICAL CALCULATIONS OF THE RELATION BETWEEN THE GIANT MAGNETORESISTANCE IN Fe/Cr SUPERLATTICES

用Ｃａｍｌｅｙ和Ｂａｒｎａｓ等人的唯象理论方法，计算了相邻铁层间具有反铁磁耦合的层数较多的Ｆｅ／Ｃｒ多层膜，在外磁场平行和垂直于膜面情况下的磁电阻与外磁场的关系，并与实验结果作了比较，符合得较好。在计算中利用对称性条件，对Ｃａｍｌｅｙ和Ｂａｒｎａｓ等人的理论进行了简化，求出了电子分布函数和磁电阻的显式解。

Based on the phenomenological theory of Camley and Barnas and coworkers(C- B),the dependence of magnetoresistance in Fe/Cr multilayers on the applied magne- tic field is calculated.In these multilayers an antiferromagnetic coupling exists be- tween any two adjacent Fe-layers.The applied magnetic field is either parallel orperpendicular to the layers.Good agreement of the calculated results with the ex- perimental ones is found.The symmetry implicitly involved in the C-B theory isdisclosed and is used to simplify the original C-B formalism,this leads to the closedexpressions for the distribution function of conducting electrons and for magnetore-sistance.