Chirality Switching and Winding or Unwinding of the Antiferromagnetic NiO Domain Walls in Fe/NiO/Fe/CoO/Ag(001)
Chirality Switching and Winding or Unwinding of the Antiferromagnetic NiO Domain Walls in Fe/NiO/Fe/CoO/Ag(001)
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DOI：
10.1103/physrevlett.113.147207
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发表时间：
2014-10-03
影响因子：
8.6
通讯作者：
Qiu, Z. Q.
中科院分区：
文献类型：
--
作者：
Li, J.;Tan, A.;Qiu, Z. Q.
采用外延生长法制备了Fe/NiO/Fe/CoO/Ag（001）单晶薄膜，并对其进行了X射线磁性圆二色性和X射线磁性线二色性研究。底部Fe层磁化通过交换耦合到CoO层而被钉扎，并且顶部Fe层磁化可以通过面内外部磁场而被旋转。我们发现，由于垂直NiO/Fe界面耦合的NiO自旋卷起形成畴壁的顶层Fe磁化旋转从0度到90度，但开关壁的手征和解除壁的Fe磁化旋转从90度到180度。这一观察表明，Mauri的180度畴壁不存在于强耦合制度下的垂直耦合铁磁-反铁磁系统。
Fe/NiO/Fe/CoO/Ag(001) single crystalline films were grown epitaxially and investigated by x-ray magnetic circular dichroism and x-ray magnetic linear dichroism. The bottom Fe layer magnetization is pinned through exchange coupling to the CoO layer and the top Fe layer magnetization can be rotated by an in-plane external magnetic field. We find that the NiO spins wind up to form a domain wall due to the perpendicular NiO/Fe interfacial coupling as the top layer Fe magnetization rotates from 0 degrees to 90 degrees, but switch wall chirality and unwind the wall as the Fe magnetization rotates from 90 degrees to 180 degrees. This observation shows that Mauri's 180 degrees domain wall does not exist in perpendicularly coupled ferromagnetic-antiferromagnetic systems in the strong coupling regime.