Structural and Magnetic Properties of LaCoO3/SrTiO3 Multilayers

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• 作者：Hongrui Zhang ; Jing Zhang ; Huaiwen Yang ; Qianqian Lan ; Deshun Hong ; Shufang Wang ; Xi Shen ; Tahira Khan ; Richeng Yu ; Jirong Sun ; Baogen Shen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：8
• 期：28
• 页码：18328-18333
• 全文大小：433K
• 年卷期：0
• ISSN：1944-8252

文摘

Structural and magnetic properties of the LaCoO₃/SrTiO₃ (LCO/STO) multilayers (MLs) with a fixed STO layer of 4 nm but varied LCO layer thicknesses have been systematically studied. The MLs grown on Sr_0.7La_0.3Al_0.65Ta_0.35O₃ (LSAT) and SrTiO₃ (STO) exhibit the in-plane lattice constant of the substrates, but those on LaAlO₃ (LAO) show the in-plane lattice constant between those of the first two kinds of MLs. Compared with the LCO single layer (SL), the magnetic order of the MLs is significantly enhanced, as demonstrated by a very slow decrease, which is fast for the SL, of the Curie temperature and the saturation magnetization as the LCO layer thickness decreases. For example, clear ferromagnetic order is observed in the ML with the LCO layer of ∼1.5 nm, whereas it vanishes below ∼6 nm for the LCO SL. This result is consistent with the observation that the dark stripes, which are believed to be closely related to the magnetic order, remain clear in the MLs while they are vague in the corresponding LCO SL. The present work suggests a novel route to tune the magnetism of perovskite oxide films.