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过渡金属氧化物异质结界面处各种自由度之间的耦合与竞争关系，极大的丰富了其物理性质，并拓展了相关应用范围。已有研究报道指出维度是调控氧化物异质结性能的有效手段。本文采用脉冲激光沉积技术制备出高质量外延生长的SrCuO2/La0.7Ca0.3MnO3(SCO/LCMO)超晶格，通过控制维度实现了对超晶格中交换耦合效应的有效调控。实验发现，在改变SCO厚度的过程中，其结构将由无限层状构型转变为链状构型，进而导致异质结界面处氧配位环境的改变。X射线吸收谱测试证实超晶格中存在电荷转移现象。在SCO较薄时，Mn-O-Cu之间超交换作用产生的弱磁矩将钉扎铁磁LCMO层。随着SCO厚度的增加，异质结界面处电荷转移减小。与此同时，SCO层具有的反铁磁序与邻近铁磁层LCMO作用，导致了交换偏置的产生。本实验证实了维度在氧化物异质结多功能调控中的重要作用。The strongly correlated of multi-degrees of freedoms at transition metal oxide heterointerfaces greatly enriches its physical properties and expands the relevant application fields. It has been reported that dimensionality is an effective method to tune the properties of oxide heterostructure. SCO films display structural transformation from planar-type to chain-type with the change of thickness. In this text, the high quality of SCO/LCMO superlattices are deposited by pulsed laser deposition system. And the interfacial exchange coupling effect is effectively manipulated by controlling the dimensionality of SCO layer. Combined with XAS measurement, it is found that the charge transfer would occur at heterointerface. When the SCO layer is thin, the interfacial superexchange coupling supported by charge transfer generates a weak magnetic moment to pin the ferromagnetic LCMO layer. The charge transfer would decrease as the SCO layer is thicken. Meanwhile, the long-range antiferromagnetic order in thicken SCO layer can interacted with LCMO layer and resulted in the exchange bias effect. This experiment confirms the important role of dimensionality to tune properties in multifunctional oxide heterostructure.
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Keywords:
- dimensionality /
- exchange bias effect /
- copper oxide /
- manganese oxide
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