锰镍酸盐超晶格中c轴磁螺旋的出现
Emergent c-axis magnetic helix in manganite-nickelate superlattices
摘要：
用X射线共振磁反射仪研究了（La 2/3Sr 1/3 MnO 3）9/（LaNiO 3）3超晶格的磁有序性质。我们观察到一个新的c轴磁螺旋状态的（LaNiO 3）3层，从来没有报道在镍酸盐，介导的铁磁（La 2/3Sr 1/3 MnO 3）9层之间的~ 130度的磁耦合，说明功率的x射线发现复杂的氧化物界面的磁状态。共振非弹性X-射线散射和X-射线吸收光谱表明，Ni-O配体空穴状态从散装LaNiO 3主要是由于从Mn的界面电子转移填充，驱动的Ni轨道更接近原子状的3d 8配置。我们讨论了这种电子配置所施加的约束所观察到的磁结构的微观起源。在（La 2/3Sr 1/3 MnO 3）9/（LaNiO 3）3中磁螺旋的存在对于模拟该系统的潜在自旋电子学功能是至关重要的，并且对于设计一般新型器件中的涌现磁性可能是重要的。
英文摘要：
The nature of the magnetic order in (La2/3Sr1/3MnO3)9/(LaNiO3)3 superlattices is investigated using x-ray resonant magnetic reflectometry. We observe a new c-axis magnetic helix state in the (LaNiO3)3 layers that had never been reported in nickelates, and which mediates the ~130deg magnetic coupling between the ferromagnetic (La2/3Sr1/3MnO3)9 layers, illustrating the power of x-rays for discovering the magnetic state of complex oxide interfaces. Resonant inelastic x-ray scattering and x-ray absorption spectroscopy show that Ni-O ligand hole states from bulk LaNiO3 are mostly filled due to interfacial electron transfer from Mn, driving the Ni orbitals closer to an atomic-like 3d8 configuration. We discuss the constraints imposed by this electronic configuration to the microscopic origin of the observed magnetic structure. The presence of a magnetic helix in (La2/3Sr1/3MnO3)9/(LaNiO3)3 is crucial for modeling the potential spintronic functionality of this system and may be important for designing emergent magnetism in novel devices in general.
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