结果表明：零偏压下，电子在反平行等强磁垒结构中输运不会产生自旋极化；
The results show that: (i) the spin-polarization of electron can not be produced in the anti-parallel magnetic barriers structure at zero bias voltage;
当磁矩反平行排列时，自旋对电子输运性质的影响消失，但电子整体的透射概率明显减小。
When the magnetic moments are antiparallel, the spin affect on the electron is vanished, and the conductance decrease obviously.
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