Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.5010601
Title: Temperature controlled evolution of monoclinic to super-tetragonal phase of epitaxial BiFeO3 thin films on La0.67Sr0.33MnO3 buffered SrTiO3 substrate
Authors: Singh A. 
Kaifeng D. 
Chen J.-S. 
Keywords: Ferroelectricity
Iron compounds
Lanthanum compounds
Magnetism
Manganese compounds
Mapping
Oxygen
Programmable logic controllers
Pulsed laser deposition
Strontium titanates
Thin films
Titanium compounds
X ray diffraction
Deposition conditions
Ferroelectric polarization
Ferromagnetic layers
High resolution X ray diffraction
Monoclinic phase
Reciprocal space mapping
SrTiO3 substrates
Tetragonal phase
Bismuth compounds
Issue Date: 2018
Citation: Singh A., Kaifeng D., Chen J.-S. (2018). Temperature controlled evolution of monoclinic to super-tetragonal phase of epitaxial BiFeO3 thin films on La0.67Sr0.33MnO3 buffered SrTiO3 substrate. AIP Advances 8 (3) : 35221. ScholarBank@NUS Repository. https://doi.org/10.1063/1.5010601
Abstract: Epitaxial BiFeO3 thin films of 130nm were deposited by pulsed laser deposition (PLD) technique on La0.67Sr0.33MnO3 buffered SrTiO3 (001) substrate at various temperatures under different ambient oxygen pressures. Reciprocal space mapping reveals that, with decreasing temperature and oxygen pressure, the broadly reported monoclinic phase (MA) of BiFeO3 thin film initially transforms to a tetragonal phase (T1) with c/a =1.05 (1) in a narrow girth of deposition condition and then to a super-tetragonal phase (T2) with giant c/a = 1.24 (1), as confirmed by reciprocal space mapping using high resolution x-ray diffraction. The surface morphology of the films reveals the island growth of the BiFeO3 films deposited at low temperatures. We propose that the transformation from monoclinic to the super-tetragonal phase is essentially due to the manifestation of excess local strain as a result of the island growth. This study offers a recipe to grow the super-tetragonal phase of BiFeO3, with giant c/a =1.24 (1) which exhibits exceptionally large ferroelectric polarization, on ferromagnetic layer La0.67Sr0.33MnO3. This phase of BiFeO3 can be utilized for the ferroelectric control of magnetism at the interface of BiFeO3 and La0.67Sr0.33MnO3. © 2018 Author(s).
Source Title: AIP Advances
URI: https://scholarbank.nus.edu.sg/handle/10635/174606
ISSN: 2158-3226
DOI: 10.1063/1.5010601
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