Interface Engineering of Domain Structures in BiFeO3 Thin Films

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• 作者：Deyang ChenZuhuang Chen ; Qian He ; James D. Clarkson ; Claudy R. Serrao ; Ajay K. Yadav ; Mark E. Nowakowski ; Zhen Fan ; Long You ; Xingsen Gao ; Dechang Zeng ; Lang Chen ; Albina Y. Borisevich ; Sayeef Salahuddin ; Jun-Ming Liu ; Jeffrey Bokor
• 刊名：Nano Letters
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：17
• 期：1
• 页码：486-493
• 全文大小：795K
• ISSN：1530-6992

文摘

A wealth of fascinating phenomena have been discovered at the BiFeO₃ domain walls, examples such as domain wall conductivity, photovoltaic effects, and magnetoelectric coupling. Thus, the ability to precisely control the domain structures and accurately study their switching behaviors is critical to realize the next generation of novel devices based on domain wall functionalities. In this work, the introduction of a dielectric layer leads to the tunability of the depolarization field both in the multilayers and superlattices, which provides a novel approach to control the domain patterns of BiFeO₃ films. Moreover, we are able to study the switching behavior of the first time obtained periodic 109° stripe domains with a thick bottom electrode. Besides, the precise controlling of pure 71° and 109° periodic stripe domain walls enable us to make a clear demonstration that the exchange bias in the ferromagnet/BiFeO₃ system originates from 109° domain walls. Our findings provide future directions to study the room temperature electric field control of exchange bias and open a new pathway to explore the room temperature multiferroic vortices in the BiFeO₃ system.