Li Linglong, Lu Lu, Zhang Dawei, Su Ran, Yang Guang, Zhai Junyi, Yang Yaodong
Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, Xi'an Jiaotong University , Xi'an 710049, China.
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.
ACS Appl Mater Interfaces. 2016 Jan 13;8(1):442-8. doi: 10.1021/acsami.5b09265. Epub 2015 Dec 23.
Strain-mediated magnetoelectric (ME) coupling effect is expected in self-assembly heterostructures engineered by ferroelectric and ferromagnetic materials, contributing to the enhanced overall magnetoelectric effect. Microstructures as well as the connectivity configuration are considered to play a significant role in achieving efficient magnetoelectric properties. Different from the conventional (1-3) and (2-2) type composite films, we fabricate BiFeO3-CoFe2O4 (BFO-CFO) composite thin films with a novel quasi (0-3) type connectivity via a dual-target pulsed laser deposition process. The self-assembly growth mechanism has been studied, which demonstrates that the perovskite (BFO) matrix segments the connectivity of spinel (CFO) resulting in a quasi (0-3) composite. Direct observation of ferroelectric domain wall motion under external magnetic fields proves a strong magnetoelectric coupling effect in these (0-3) thin films. Our preliminary findings reveal the promising application potential of this new structure as multiferroic domain wall devices.
在由铁电和铁磁材料构建的自组装异质结构中有望实现应变介导的磁电（ME）耦合效应，这有助于增强整体磁电效应。微观结构以及连通性配置被认为在实现高效磁电性能方面起着重要作用。与传统的（1-3）型和（2-2）型复合薄膜不同，我们通过双靶脉冲激光沉积工艺制备了具有新型准（0-3）型连通性的BiFeO3-CoFe2O4（BFO-CFO）复合薄膜。研究了自组装生长机制，结果表明钙钛矿（BFO）基体将尖晶石（CFO）的连通性分割开来，从而形成准（0-3）复合材料。在外部磁场下对铁电畴壁运动的直接观察证明了这些（0-3）薄膜中存在强磁电耦合效应。我们的初步研究结果揭示了这种新结构作为多铁性畴壁器件具有广阔的应用潜力。
