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Interface strain-induced multiferroicity in a SmFeO3 film
Australian Institute for Innovative Materials - Papers
  • Zhenxiang Cheng, University of Wollongong
  • Fang Hong, University of Wollongong
  • Yuanxu Wang, Henan University
  • Kiyoshi Ozawa, National Institute for Materials Science, Japan
  • Hiroki Fujii, National Institute for Materials Science, Japan
  • Hideo Kimura, National Institute For Materials Science
  • Yi Du, University of Wollongong
  • Xiaolin Wang, University of Wollongong
  • S X Dou, University of Wollongong
RIS ID
90973
Publication Date
1-1-2014
Publication Details

Cheng, Z., Hong, F., Wang, Y., Ozawa, K., Fujii, H., Kimura, H., Du, Y., Wang, X. & Dou, S. (2014). Interface strain-induced multiferroicity in a SmFeO3 film. ACS Applied Materials and Interfaces, 6 (10), 7356-7362.

Abstract
An epitaxial pseudocubic SmFeO3 thin film on (100) Nb-SrTiO 3 was studied based on ferroelectric (FE) characterization and magnetic measurements. High-resolution transmission electron microscopy images clarify the nature of the epitaxial growth, the stress-induced structural distortion at the film/substrate interface, and the existence of two different orientation lattices. Clear grain boundaries can be seen, which could introduce an extra local distortion. Rectangular FE loops can be observed at room temperature, even by just applying a small voltage ranging from -1 to +1 V, indicative of the presence of FE polarization. Piezoelectric force microscopy images confirm the existence of FE domains and the switchable polarization. A strong ferromagnetic-like transition occurs around 185 K, which is much lower than the transition observed in the bulk sample. It is believed that the pseudocubic structure enhances FE polarization and decreases the magnetic ordering temperature, which is confirmed by the first-principles theoretical calculations. Meanwhile, the ferroelectricity in this thin film should originate from distortion and modification in the structural modules rather than from the exchange striction interaction that is found in the bulk SmFeO3.
Grant Number
ARC/FT0990287
Citation Information
Zhenxiang Cheng, Fang Hong, Yuanxu Wang, Kiyoshi Ozawa, et al.. "Interface strain-induced multiferroicity in a SmFeO3 film" (2014) p. 7356 - 7362
Available at: http://works.bepress.com/sxdou/584/