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首页> 外文期刊>Physical Review X >Oscillatory Noncollinear Magnetism Induced by Interfacial Charge Transfer in Superlattices Composed of Metallic Oxides
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Oscillatory Noncollinear Magnetism Induced by Interfacial Charge Transfer in Superlattices Composed of Metallic Oxides

机译：金属氧化物组成的超晶格中界面电荷转移引起的振荡非共线磁性。

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摘要

Interfaces between correlated complex oxides are promising avenues to realize new forms of magnetism that arise as a result of charge transfer, proximity effects, and locally broken symmetries. We report on the discovery of a noncollinear magnetic structure in superlattices of the ferromagnetic metallic oxide La 2 / 3 Sr 1 / 3 MnO 3 (LSMO) and the correlated metal LaNiO 3 (LNO). The exchange interaction between LSMO layers is mediated by the intervening LNO, such that the angle between the magnetization of neighboring LSMO layers varies in an oscillatory manner with the thickness of the LNO layer. The magnetic field, temperature, and spacer thickness dependence of the noncollinear structure are inconsistent with the bilinear and biquadratic interactions that are used to model the magnetic structure in conventional metallic multilayers. A model that couples the LSMO layers to a helical spin state within the LNO fits the observed behavior. We propose that the spin-helix results from the interaction between a spatially varying spin susceptibility within the LNO and interfacial charge transfer that creates localized Ni 2 + states. Our work suggests a new approach to engineering noncollinear spin textures in metallic oxide heterostructures.
机译：相关的复合氧化物之间的界面是实现新形式的磁性的有前途的途径，这种形式的磁性是由电荷转移，邻近效应和局部破坏的对称性产生的。我们报告了在铁磁金属氧化物La 2/3 Sr 1/3 MnO 3（LSMO）和相关金属LaNiO 3（LNO）的超晶格中发现非共线磁性结构的报道。 LSMO层之间的交换相互作用由中间的LNO介导，使得相邻的LSMO层的磁化之间的角度随着LNO层的厚度振荡地变化。非共线结构的磁场，温度和间隔物厚度的依赖性与用于对常规金属多层中的磁结构进行建模的双线性和双二次相互作用不一致。将LSMO层耦合到LNO内的螺旋自旋状态的模型符合观察到的行为。我们提出，自旋螺旋是由LNO内空间变化的自旋磁化率与产生局部Ni 2 +状态的界面电荷转移之间的相互作用引起的。我们的工作提出了一种工程化金属氧化物异质结构中非共线自旋织构的新方法。

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