AI 中文总结
该研究在特定异质结中发现PbTiO3层的极性涡旋超结构可驱动界面应变耦合，利用共振X射线反射率证实铁电与铁磁层间的强应变耦合，为纳米磁调制设计提供新途径。
AI 中文摘要
氧化物异质结的界面耦合是凝聚态物理的核心问题，通常通过晶格极化与应变介导的局域相互作用在原子尺度产生。本研究在DyScO3(110)衬底上生长的(PbTiO3)16/(SrRuO3)9/(PbTiO3)16异质结中，探究由纳米级极性超结构驱动的界面应变耦合。在合适的外延应变条件下，PbTiO3层形成周期约10 nm的极性涡旋超结构，产生的面内纳米级应变调制会延伸至SrRuO3层。利用元素分辨共振X射线反射率，探测界面处锶与钌亚晶格的纳米级应变调制，揭示铁电与铁磁层间存在强界面应变耦合。这些发现为通过界面应变与极化调控设计纳米级磁调制提供了新视角。
英文摘要
Interfacial coupling in oxide heterostructures is a central problem in condensed-matter physics, as it typically emerges at the atomic scale through local interactions mediated by lattice polarization and strain. In this work, we investigate nanoscale polar-supertexture-driven interfacial strain coupling in (PbTiO3)16/(SrRuO3)9/(PbTiO3)16 heterostructures grown on DyScO3(110) substrates. Under appropriate epitaxial strain conditions, the PbTiO3 layers form polar vortex superstructures with a periodicity of approximately 10 nm. We demonstrate that the resulting in-plane nanoscale strain modulation propagates into the SrRuO3 layer. Using element-specific resonant X-ray reflectivity, we probe the nanoscale strain modulations of the strontium and ruthenium sublattices at the interface, revealing strong interfacial strain coupling between the ferroelectric and ferromagnetic layers. These findings provide new insights into engineering nanoscale magnetic modulations through interfacial strain and polarization control.
Comments11 pages, 5 figures
