Suppression of mixed-phase areas in highly elongated BiFeO3 thin films on NdAlO3 substrates

Suppression of mixed-phase areas in highly elongated BiFeO3 thin films on NdAlO3 substrates

Mixed-phase areas are produced in highly elongated BiFeO3 (BFO) thin films as a consequence of strain relaxation. A (001) neodymium aluminate (NdAlO3; NAO) substrate (a∼3.747 Å) prominently suppresses the strain relaxation effect and prevents the formation of mixed-phase regions. This creates a path...

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Bibliographic Details
Main Authors: Woo, Chang-Su, Lee, Jin Hong, Chu, Kanghyun, Jang, Byung-Kweon, Kim, Yong-Bae, Koo, Tae Yeong, Yang, Ping, Qi, Yajun, Chen, Zuhuang, Chen, Lang, Choi, Hong Chul, Shim, Ji Hoon, Yang, Chan-Ho
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/95575
http://hdl.handle.net/10220/9361
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Institution: Nanyang Technological University
Language: English
Description
Summary:Mixed-phase areas are produced in highly elongated BiFeO3 (BFO) thin films as a consequence of strain relaxation. A (001) neodymium aluminate (NdAlO3; NAO) substrate (a∼3.747 Å) prominently suppresses the strain relaxation effect and prevents the formation of mixed-phase regions. This creates a pathway to the thick, quasipure, highly elongated phases required for magnetoelectric applications. We characterize the crystal structure, the interface between film and substrate, the surface morphology, and the ferroelectric domain structure of BFO films on NAO substrates and compare them with those of films on typical lanthanum aluminate substrates. The underlying mechanisms are discussed based on the intriguing nature of phase competition in bismuth ferrite phases using first principles density functional calculations for the misfit strain-dependent total energy.

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