Orientation dependence of ferroelectric behavior of BiFeO{sub 3} thin films
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574 (Singapore)
Multiferroic BiFeO{sub 3} (BFO) thin films with (111), (100), (110) preferred, and random orientations were deposited by radio frequency magnetron sputtering on SrRuO{sub 3}-buffered SrTiO{sub 3}(111), SrTiO{sub 3}(100), SrTiO{sub 3}(110), and Pt(111)/Ti/SiO{sub 2}/Si(100) substrates, respectively. The orientation dependences of ferroelectric and fatigue behavior of the BFO thin films were investigated. As expected, the (111)-oriented BFO thin film exhibits the highest, giant ferroelectric polarization (2P{sub r}=196.9 muC/cm{sup 2}) at 1 kHz and room temperature using positive up negative down measurement, while the (100)-oriented BFO thin film possesses an almost fatigue-free behavior up to 5.25x10{sup 7} switching cycles when measured at 100 kHz and room temperature. The observed behavior confirms that the largest spontaneous polarization direction and the fatigue endurance are (111) and (100) for BFO thin films, respectively. Regardless of the film orientation, the charge carriers that are responsible for dielectric relaxation and conductivity are oxygen vacancies (V{sub O}) .
- OSTI ID:
- 21361936
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 10 Vol. 106; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
CHARGE CARRIERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DEPOSITION
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELEMENTS
FATIGUE
FERROELECTRIC MATERIALS
FILMS
FREQUENCY RANGE
KHZ RANGE
KHZ RANGE 01-100
MATERIALS
MECHANICAL PROPERTIES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
POLARIZATION
RADIATIONS
RADIOWAVE RADIATION
RELAXATION
SILICON COMPOUNDS
SILICON OXIDES
SPUTTERING
STRONTIUM COMPOUNDS
STRONTIUM TITANATES
SUBSTRATES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VACANCIES