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首页> 外文期刊>Physical review >Linear magnetoelectricity at room temperature in perovskite superlattices by design
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Linear magnetoelectricity at room temperature in perovskite superlattices by design

机译：钙钛矿超晶格在室温下的线性磁电设计

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摘要

Discovering materials that display a linear magnetoelectric (ME) effect at room temperature is a challenge. Such materials could facilitate devices based on the electric field control of magnetism. Here we present simple, chemically intuitive design rules to identify a class of bulk magnetoelectric materials based on the "bicolor" layering of Pbnm ferrite perovskites, e.g., LaFeO_3/LnFeO_3 superlattices, Ln = lanthanide cation. We use first-principles density functional theory calculations to confirm these ideas. We elucidate the origin of this effect and show it is a general consequence of the layering of any bicolor Pbnm perovskite superlattice in which the number of constituent layers are odd (leading to a form of hybrid improper ferroelectricity). Our calculations suggest that the ME effect in these superlattices is larger than that observed in the prototypical magnetoelectric materials Cr_2O_3 and BiFeO_3. Furthermore, in these proposed materials, the strength of the linear ME coupling increases with the magnitude of the induced spontaneous polarization which is controlled by the La/Ln cation radius mismatch. We use a simple mean field model to show that the proposed materials order magnetically above room temperature.
机译：发现在室温下显示线性磁电（ME）效应的材料是一项挑战。这样的材料可以促进基于磁场的电场控制的装置。在这里，我们提出简单，化学直观的设计规则，以基于Pbnm铁氧体钙钛矿的“双色”分层（例如LaFeO_3 / LnFeO_3超晶格，Ln =镧系元素阳离子）来识别一类块状磁电材料。我们使用第一性原理密度泛函理论计算来证实这些想法。我们阐明了这种效应的起源，并表明这是任何双色Pbnm钙钛矿超晶格分层的普遍结果，其中组成层数奇数（导致形成混合不当铁电）。我们的计算表明，在这些超晶格中的ME效应要比在典型的磁电材料Cr_2O_3和BiFeO_3中观察到的要大。此外，在这些提出的材料中，线性ME耦合的强度随着由La / Ln阳离子半径失配控制的自发极化强度的增加而增加。我们使用一个简单的平均场模型来表明所提出的材料在室温以上具有磁性。

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