厚度为7～100 nm La0.7Sr0.3MnO3(LSMO)薄膜是由脉冲激光法生长在(001)(LaAlO3)0.3(Sr2AlTaO6)0.7(LSAT)衬底上,薄膜的结构演变是由高分辨X-射线ω-摇摆曲线及倒易空间(103)反射来表征,我们的结果表明所有的LSMO薄膜是共格生长在LSAT(001)上,对厚度大于(或等于)22 nm的LSMO薄膜既显示可调制的单斜(MA)结构,也包含切应变弛豫诱导的有序畴结构和平面内超格子,薄膜的厚度依赖的结构畴宽,以及切应变对薄膜居里温度Tc的影响被仔细研究,作为对比,晶格失配对LSMO薄膜中周期畴形成的影响也被讨论.
Epitaxial La0.7Sr0.3MnO3 (LSMO) films with 7 ～ 100nm thick have grown on (001) (LaAlO3)0.3 ( Sr2AlTaO6 )0.7 (LSAT) substrates by using pulse laser deposition. The structure evolution of LSMO films are characterized carefully by high-resolution X-ray o-rocking curves and reciprocal space (103) maps. Our results indicate that all LSMO films are coherendy grown on LSAT (001). For the film with a thickness of 22 nm or above, there is both a modified mon-oclinic structure (MA ), and the shear strain relaxation can induce domain ordering and in-plane superlattice in the LSMO films. The thickness dependence of the domain width, as well the shear strain effect on the Curie temperate Tc was investi-gated carefully. In contrast, the lattice mismatch between the film and substrate impacts on the periodic domain ordering of the LSMO films was also discussed.
参考文献
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