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（a）3.4 V和（b）5.8 V极化后的电畴构型。由深至浅四种灰度分别代表极化方向沿着[11 ̅1]、[1 ̅1 ̅1]、[1 ̅11]和[111]的电畴。头对头、头对尾和尾对尾畴壁分别由橙色、浅蓝色和紫色线条标出。（c）每个极化过程中三种畴壁的平均移动距离。由（d）较小电压和（e）较大电压扫描极化组成的两步极化过程，实现了对BiFeO3薄膜中导电畴壁的调控，形成（f）有序分布的长条形尾对尾畴壁。

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