Fernández-Posada Carmen M, Castro Alicia, Kiat Jean-Michel, Porcher Florence, Peña Octavio, Algueró Miguel, Amorín Harvey
Instituto de Ciencia de Materiales de Madrid, CSIC. Cantoblanco, 28049 Madrid, Spain.
Laboratoire Structures, Propriétés et Modélisation des Solides, Associé au CNRS (UMR8580), Ecole Centrale Paris, 92295 Chatenay-Malabry, France.
Nat Commun. 2016 Sep 28;7:12772. doi: 10.1038/ncomms12772.
There is a growing activity in the search of novel single-phase multiferroics that could finally provide distinctive magnetoelectric responses at room temperature, for they would enable a range of potentially disruptive technologies, making use of the ability of controlling polarization with a magnetic field or magnetism with an electric one (for example, voltage-tunable spintronic devices, uncooled magnetic sensors and the long-searched magnetoelectric memory). A very promising novel material concept could be to make use of phase-change phenomena at structural instabilities of a multiferroic state. Indeed, large phase-change magnetoelectric response has been anticipated by a first-principles investigation of the perovskite BiFeO-BiCoO solid solution, specifically at its morphotropic phase boundary between multiferroic polymorphs of rhombohedral and tetragonal symmetries. Here, we report a novel perovskite oxide that belongs to the BiFeO-BiMnO-PbTiO ternary system, chemically designed to present such multiferroic phase boundary with enhanced ferroelectricity and canted ferromagnetism, which shows distinctive room-temperature magnetoelectric responses.
目前，寻找新型单相多铁性材料的研究活动日益活跃，这类材料最终可能在室温下展现出独特的磁电响应，因为它们能够催生一系列具有潜在颠覆性的技术，利用磁场控制极化或电场控制磁性的能力（例如，电压可调自旋电子器件、非制冷磁传感器以及长期探索的磁电存储器）。一种非常有前景的新型材料概念可能是利用多铁性态结构不稳定性处的相变现象。事实上，通过对钙钛矿BiFeO - BiCoO固溶体的第一性原理研究，特别是在其菱面体和四方对称多铁性多晶型之间的准同型相界处，已经预测到了大的相变磁电响应。在此，我们报道了一种新型钙钛矿氧化物，它属于BiFeO - BiMnO - PbTiO三元体系，经过化学设计呈现出这种具有增强铁电性和倾斜铁磁性的多铁性相界，表现出独特的室温磁电响应。
