Coexistence of Magnetic Order and Ferroelectricity at 2D Nanosheet Interfaces

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• 作者：Bao-Wen Li ; Minoru Osada ; Yasuo Ebina ; Shigenori Ueda ; Takayoshi Sasaki
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：June 22, 2016
• 年：2016
• 卷：138
• 期：24
• 页码：7621-7625
• 全文大小：391K
• 年卷期：0
• ISSN：1520-5126

文摘

Multiferroic materials, in which the electronic polarization can be switched by a magnetic field and vice versa, are of fundamental importance for new electronic technologies. However, there exist very few single-phase materials that exhibit such cross-coupling properties at room temperature, and heterostructures with a strong magnetoelectric coupling have only been made with complex techniques. Here, we present a rational design for multiferroic materials by use of a layer-by-layer engineering of 2D nanosheets. Our approach to new multiferroic materials is the artificial construction of high-quality superlattices by interleaving ferromagnetic Ti_0.8Co_0.2O₂ nanosheets with dielectric perovskite-structured Ca₂Nb₃O₁₀ nanosheets. Such an artificial structuring allows us to engineer the interlayer coupling, and the (Ti_0.8Co_0.2O₂/Ca₂Nb₃O₁₀/Ti_0.8Co_0.2O₂) superlattices induce room-temperature ferroelectricity in the presence of the ferromagnetic order. Our technique provides a new route for tailoring artificial multiferroic materials in a highly controllable manner.