对于Ta/NiFe/Cu/NiFe/FeMn/Ta自旋阀多层膜,Cu原子偏聚到NiFe/FeMn界面将导致自旋阀多层膜中NiFe/FeMn的交换耦合场Hex下降.然而,少量的表面活化原子Bi被沉积到Cu层和被钉扎NiFe层之间,Cu原子在NiFe/FeMn界面的偏聚可以被抑制;而且,更重要的是Ta/NiFe/Cu/NiFe/FeMn/Ta自旋阀多层膜中的交换耦合场Hex可以被有效地提高.
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