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厚度为7～100nm 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)22nm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.
The La0.7Sr0.3MnO3 (LSMO) thin films with a thickness of 7 ~ 100nm are grown on the (001) (LaAlO3) 0.3 (Sr2AlTaO6) 0.7 (LSAT) substrate by pulsed laser.The structure evolution of the films is characterized by high resolution X-ray ω-rocking curves, and reciprocal space (103) reflections. Our results show that all LSMO films co-grow on LSAT (001). For LSMO films greater than (or equal to) 22 nm in thickness, The monoclinic (MA) structure also contains ordered domain structures induced by shear relaxation and in-plane supergratings. The thickness-dependent structure domain width of the films and the effect of shear strain on the film's Curie temperature Tc are carefully studied. In contrast, the effect of lattice mismatch on the formation of periodic domains in LSMO films is also discussed.