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Interfacial Multiferroics of TiO2/PbTiO3 Heterostructure Driven by Ferroelectric Polarization Discontinuity
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-01-05 00:00:00 , DOI: 10.1021/acsami.6b13183 Fang Wang , Zhaohui Ren , He Tian , Shengyuan A. Yang 1 , Yanwu Xie , Yunhao Lu , Jianzhong Jiang , Gaorong Han , Kesong Yang 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-01-05 00:00:00 , DOI: 10.1021/acsami.6b13183 Fang Wang , Zhaohui Ren , He Tian , Shengyuan A. Yang 1 , Yanwu Xie , Yunhao Lu , Jianzhong Jiang , Gaorong Han , Kesong Yang 2
Affiliation
Novel phenomena appear when two different oxide materials are combined together to form an interface. For example, at the interface of LaAlO3/SrTiO3, two-dimensional conductive states form to avoid the polar discontinuity, and magnetic properties are found at such an interface. In this work, we propose a new type of interface between two nonmagnetic and nonpolar oxides that could host a magnetic state, where it is the ferroelectric polarization discontinuity instead of the polar discontinuity that leads to the charge transfer, forming the interfacial magnetic state. As a concrete example, we investigate by first-principles calculations the heterostructures made of ferroelectric perovskite oxide PbTiO3 and nonferroelectric polarized oxide TiO2. We show that charge is transferred to the interfacial layer forming an interfacial ferromagnetic ordering that may persist up to room temperature. Especially, the strong coupling between bulk ferroelectric polarization and interface ferromagnetism represents a new type of magnetoelectric effect, which provides an ideal platform for exploring the intriguing interfacial multiferroics. The findings here are important not only for fundamental science but also for promising applications in nanoscale electronics and spintronics.
中文翻译:
铁电极化不连续性驱动的TiO 2 / PbTiO 3异质结构界面多铁性
当两种不同的氧化物材料结合在一起形成界面时,就会出现新的现象。例如,在LaAlO 3 / SrTiO 3的界面处,形成二维导电态以避免极性不连续,并且在这样的界面处发现了磁性。在这项工作中,我们提出了一种在两种非磁性和非极性氧化物之间可能具有磁性状态的新型界面,其中是铁电极化不连续性而不是极性不连续性导致电荷转移,从而形成了界面磁性状态。作为一个具体的例子,我们通过第一性原理研究来研究铁电钙钛矿氧化物PbTiO 3和非铁电极化氧化物TiO 2的异质结构。。我们显示电荷被转移到界面层,形成界面铁磁有序,并可能持续到室温。特别是,体铁电极化和界面铁磁之间的强耦合代表了一种新型的磁电效应,为探索有趣的界面多铁磁学提供了理想的平台。此处的发现不仅对基础科学很重要,而且对于纳米级电子和自旋电子学中有希望的应用也很重要。
更新日期:2017-01-05
中文翻译:
铁电极化不连续性驱动的TiO 2 / PbTiO 3异质结构界面多铁性
当两种不同的氧化物材料结合在一起形成界面时,就会出现新的现象。例如,在LaAlO 3 / SrTiO 3的界面处,形成二维导电态以避免极性不连续,并且在这样的界面处发现了磁性。在这项工作中,我们提出了一种在两种非磁性和非极性氧化物之间可能具有磁性状态的新型界面,其中是铁电极化不连续性而不是极性不连续性导致电荷转移,从而形成了界面磁性状态。作为一个具体的例子,我们通过第一性原理研究来研究铁电钙钛矿氧化物PbTiO 3和非铁电极化氧化物TiO 2的异质结构。。我们显示电荷被转移到界面层,形成界面铁磁有序,并可能持续到室温。特别是,体铁电极化和界面铁磁之间的强耦合代表了一种新型的磁电效应,为探索有趣的界面多铁磁学提供了理想的平台。此处的发现不仅对基础科学很重要,而且对于纳米级电子和自旋电子学中有希望的应用也很重要。