Complex oxides with tunable structures have many fascinating properties, though high-quality complex oxide epitaxy with precisely controlled composition is still out of reach. Here we have successfully developed solution-based single-crystalline epitaxy for multiferroic (1-x)BiTi_(1-y)/2Fe_yMg_(1-y)/2O₃–(x)CaTiO₃ (BTFM–CTO) solid solution in large area, confirming its ferroelectricity at the atomic scale with strong spontaneous polarization. Careful compositional tuning leads to a bulk magnetization of 0.07 ± 0.035 μ_B/Fe at room temperature, enabling magnetically induced polarization switching exhibiting a large magnetoelectric coefficient of 2.7–3.0 × 10⁻⁷ s/m. This work demonstrates the great potential of solution processing in large-scale complex oxide epitaxy and establishes novel room-temperature magnetoelectric coupling in epitaxial BTFM–CTO film, making it possible to explore a much wider space of composition, phase, and structure that can be easily scaled up for industrial applications.

中文翻译：

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通过溶液处理实现具有磁切换极化的大规模多铁性复合氧化物外延

具有可调结构的复合氧化物具有许多迷人的特性，尽管具有精确控制成分的高质量复合氧化物外延仍然遥不可及。在这里，我们成功开发了用于多铁性 (1- x )BiTi _{(1- y )/2} Fe _y Mg _{(1- y )/2} O ₃ –( x ) CaTiO ₃ (BTFM-CTO)的基于溶液的单晶外延大面积的固溶体，证实了其在原子尺度上具有强自发极化的铁电性。仔细的成分调整导致体磁化强度为 0.07 ± 0.035 μ _B/Fe 在室温下，实现磁致极化切换，表现出 2.7–3.0 × 10 ^-7  s/m的大磁电系数。这项工作展示了大规模复合氧化物外延中溶液处理的巨大潜力，并在外延 BTFM-CTO 薄膜中建立了新的室温磁电耦合，从而有可能探索更广泛的成分、相和结构空间。易于扩展以用于工业应用。