在Co/FeMn双层膜上观察到的X射线线性二向色性的巨大磁晶各向异性
Huge magneto-crystalline anisotropy of x-ray linear dichroism observed on Co/FeMn bilayers
摘要：
利用X射线磁圆二向色性（XMLD）和磁圆二向色性（XMCD），结合光电子发射显微镜（PEEM），对Cu（001）衬底上的单晶磁性FeMn/Co双层膜进行了X射线光谱研究。利用铁磁Co层和反铁磁FeMn层之间的磁耦合，我们能够在同一样品中同时产生具有两种不同易磁化轴晶向的磁畴。我们发现两种类型的磁畴之间的XMLD对比度存在巨大差异，我们讨论了Co层的XMLD的固有磁晶各向异性。我们还表明，由于该方法的高灵敏度，少量的FeMn-Co界面处的诱导铁磁Fe磁矩足以从金属系统中的XMLD获得磁对比度。
英文摘要：
We present an x-ray spectromicroscopic investigation of single-crystalline magnetic FeMn/Co bilayers on Cu(001), using X-ray magnetic circular (XMCD) and linear (XMLD) dichroism at the Co and Fe L3 absorption edges in combination with photoelectron emission microscopy (PEEM). Using the magnetic coupling between the ferromagnetic Co layer and the antiferromagnetic FeMn layer we are able to produce magnetic domains with two different crystallographic orientations of the magnetic easy axis within the same sample at the same time. We find a huge difference in the XMLD contrast between the two types of magnetic domains, which we discuss in terms of intrinsic magneto-crystalline anisotropy of XMLD of the Co layer. We also demonstrate that due to the high sensitivity of the method, the small number of induced ferromagnetic Fe moments at the FeMn-Co interface is sufficient to obtain magnetic contrast from XMLD in a metallic system.
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