Element-specific depth profile of magnetism and stoichiometry at the La0.67Sr0.33MnO3/BiFeO3 interface
Element-specific depth profile of magnetism and stoichiometry at the La0.67Sr0.33MnO3/BiFeO3 interface
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DOI：
10.1103/physrevb.90.041113
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发表时间：
2014-07-31
影响因子：
3.7
通讯作者：
Ulrich, C.
中科院分区：
文献类型：
--
作者：
Bertinshaw, J.;Brueck, S.;Ulrich, C.
深度敏感的磁性、结构和化学表征对于理解和优化过渡金属氧化物异质结构界面处出现的物理现象非常重要。在一个同时的方法，我们已经使用极化中子和共振X射线反射仪，以确定整个原子级尖锐的界面的铁磁性La0.67Sr0.33MnO3/多铁性BiFeO 3双层亚纳米分辨率的磁性配置文件。特别是，在Fe和Mn的共振边缘的X射线共振磁反射率测量允许我们确定在两个La0.67Sr0.33MnO3和BiFeO 3层的铁磁磁矩的元素特定的深度分布。我们的测量表明在La0.67Sr0.33MnO3层内存在磁稀释界面层，这与先前对反向沉积层的观察相反[P. Yu等人，物理修订信函105，027201（2010）]。额外的共振X射线反射测量表明在界面处的Mn和O含量改变的区域，其厚度与磁性稀释层的厚度相匹配，作为磁矩减少的起源。
Depth-sensitive magnetic, structural, and chemical characterization is important in the understanding and optimization of physical phenomena emerging at the interfaces of transition metal oxide heterostructures. In a simultaneous approach we have used polarized neutron and resonant x-ray reflectometry to determine the magnetic profile across atomically sharp interfaces of ferromagnetic La0.67Sr0.33MnO3/multiferroic BiFeO3 bilayers with subnanometer resolution. In particular, the x-ray resonant magnetic reflectivity measurements at the Fe and Mn resonance edges allowed us to determine the element-specific depth profile of the ferromagnetic moments in both the La0.67Sr0.33MnO3 and BiFeO3 layers. Our measurements indicate a magnetically diluted interface layer within the La0.67Sr0.33MnO3 layer, in contrast to previous observations on inversely deposited layers [P. Yu et al., Phys. Rev. Lett. 105, 027201 (2010)]. Additional resonant x-ray reflection measurements indicate a region of altered Mn and O content at the interface, with a thickness matching that of the magnetic diluted layer, as the origin of the reduction of the magnetic moment.