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Novel Multiferroic Phases and Phenomena in Epitaxial (111) BiFeO3 Films
Advanced Electronic Materials ( IF 6.2 ) Pub Date : 2017-09-28 , DOI: 10.1002/aelm.201700332
Changsong Xu 1 , Hongjun Xiang 1, 2 , Laurent Bellaiche 1
Affiliation  

Multiferroics are attracting much interest because they simultaneously possess ordered electric and magnetic dipoles. In particular, numerous recent studies are devoted to find novel multiferroic phases, as, for example evidenced by the flurry of activities that accompanied the discovery of the so‐called T‐phase in BiFeO3 systems, when these latter are made in forms of (001) epitaxial films and subject to high‐enough compressive strains. Here it is predicted, via the combined use of a genetic algorithm and first‐principles calculations, that novel multiferroic phases, as well as new phenomena, can also occur in epitaxial BiFeO3 films, but when grown along the less conventional [111] direction and when experiencing large enough tensile strains. One example includes the hexagonal YMnO3‐type P63cm phase, that exhibits an anomalous behavior for its out‐of‐plane electric polarization and that can also undergo magnetic transitions when varying the tensile strain. Another striking example is the emergence of an unusual crystal structure of triclinic symmetry, that possesses controllable polarization's direction as well as magnetic spiral structures whose characteristics (e.g., periodicity and propagation direction) can be altered by epitaxial strain. Such findings may open new ways to design multiferroics and novel devices exploiting their cross‐coupling between electric and magnetic properties.

中文翻译:

外延(111)BiFeO3薄膜中的新型多铁性相和现象。

多重铁磁引起人们极大的兴趣,因为它们同时拥有有序的电偶极和磁偶极子。特别是,最近的大量研究致力于发现新颖的多铁性相,例如,伴随着在BiFeO 3系统中发现所谓的T相的一系列活动证明了这一点,当这些相以( 001)外延膜并承受足够高的压缩应变。在这里,通过遗传算法和第一性原理计算的结合使用,可以预测在外延BiFeO 3薄膜中也会出现新颖的多铁性相以及新现象,但是当沿着不太传统的[111]方向生长时当承受足够大的拉伸应变时。一个例子包括六角形的YMnO3P6 3 cm相,由于其面外极化表现出异常行为,并且在改变拉伸应变时也可能发生磁跃变。另一个引人注目的例子是出现了三斜对称的异常晶体结构,该晶体结构具有可控的极化方向以及外延应变可以改变其特性(例如,周期性和传播方向)的磁螺旋结构。这些发现可能会开辟新的方法来设计多铁氧体,并利用它们在电和磁特性之间的交叉耦合来开发新颖的设备。
更新日期:2017-09-28
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