Large-scale multiferroic complex oxide epitaxy with magnetically switched polarization enabled by solution processing

• 来源期刊: 国家科学评论（英文版）
• 关键词: complex oxide solution method epitaxy multiferroic
• 年，卷（期）: 2020,（1）
• 页码范围: 84-91
• 页数: 8页
• 语种: 英文
• DOI: 10.1093/nsr/nwz143

摘要

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)/2FeyMg(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 μB/Fe at room temperature,enabling magnetically induced polarization switching exhibiting a large magnetoelectric coefficient of 2.7-3.0 × 10-v 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.