AI 中文总结
研究通过脉冲激光沉积在GGG(111)衬底上生长外延YIG和GdIG薄膜及其双层异质结构，利用多种技术研究结构特性，发现生长序列对控制应变和界面结构至关重要，GGG/YIG/GdIG堆叠序列结构质量好、缺陷密度低。
AI 中文摘要
使用脉冲激光沉积在Gd$_3$Ga$_5$O$_{12}$(GGG)(111)衬底上生长外延Y$_3$Fe$_5$O$_{12}$(YIG)和Gd$_3$Fe$_5$O$_{12}$(GdIG)薄膜及其双层异质结构。通过X射线衍射、倒易空间映射和横截面透射电子显微镜研究结构特性。结果证实了高结晶质量和相干外延生长，RSM揭示了由层序列控制的应变和部分弛豫区域的共存。TEM分析显示了尖锐的界面、柱状微观结构和有助于应变弛豫的反相边界。比较研究表明GGG/YIG/GdIG堆叠序列具有改善的结构质量和降低的缺陷密度，这归因于YIG在衬底上的优异外延生长。这些发现突出了生长序列在控制石榴石异质结构中的应变和界面结构方面的关键作用。
英文摘要
Epitaxial Y$_3$Fe$_5$O$_{12}$ (YIG) and Gd$_3$Fe$_5$O$_{12}$ (GdIG) thin films, along with their bilayer heterostructures, were grown on Gd$_3$Ga$_5$O$_{12}$(GGG)(111) substrates using pulsed laser deposition. Structural properties were investigated using X-ray diffraction, reciprocal space mapping, and cross-sectional transmission electron microscopy. The results confirm high crystalline quality and coherent epitaxial growth, with RSM revealing a coexistence of strained and partially relaxed regions governed by layer sequence. TEM analysis shows sharp interfaces, columnar microstructures, and antiphase boundaries that facilitate strain relaxation. A comparative study indicates that the GGG/YIG/GdIG stacking sequence exhibits improved structural quality with reduced defect density, attributed to the superior epitaxial growth of YIG on the substrate. These findings highlight the critical role of growth sequence in controlling strain and interfacial structure in garnet heterostructures.
