Ferroelectric polarization switching with a remarkably high activation energy in orthorhombic GaFeO3 thin films
SCIE
SCOPUS
- Title
- Ferroelectric polarization switching with a remarkably high activation energy in orthorhombic GaFeO3 thin films
- Authors
- Song, S; Jang, HM; Lee, Nam-Suk; Son, JY; Gupta, R; Garg, A; Ratanapreechachai, J; Scott, JF
- Date Issued
- 2016-02
- Publisher
- Nature Publishing Group
- Abstract
- Orthorhombic GaFeO3 (o-GFO) with the polar Pna2(1) space group is a prominent ferrite owing to its piezoelectricity and ferrimagnetism, coupled with magnetoelectric effects. Herein, we demonstrate large ferroelectric remanent polarization in undoped o-GFO thin films by adopting either a hexagonal strontium titanate (STO) or a cubic yttrium-stabilized zirconia (YSZ) substrate. The polarization-electric-field hysteresis curves of the polar c-axis-grown o-GFO film on a SrRuO3/STO substrate show the net switching polarization of similar to 35 mu C cm(-2) with an unusually high coercive field (E-c) of +/- 1400 kV cm(-1) at room temperature. The positive-up and negative-down measurement also demonstrates the switching polarization of similar to 26 mu C cm(-2). The activation energy for the polarization switching, as obtained by density-functional theory calculations, is remarkably high, 1.05 eV per formula unit. We have theoretically shown that this high value accounts for the extraordinary high E-c and the stability of the polar Pna2(1) phase over a wide range of temperatures up to 1368 K.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/36046
- DOI
- 10.1038/AM.2016.3
- ISSN
- 1884-4049
- Article Type
- Article
- Citation
- NPG Asia Materials, vol. 8, 2016-02
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